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学者姓名：卢月美
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Abstract ：
Compared to duplex stainless steels (DSSs) prepared by traditional methods, specimens produced through laser powder bed fusion (LPBF) exhibit excellent yield strength but lower elongation. To improve elongation, understanding microstructure evolution during uniaxial tensile testing is crucial. This study investigates the slip behavior, grain boundary evolution, and phase transformation of LPBF 2205 duplex stainless steel during tensile deformation using in-situ electron backscatter diffraction (EBSD). Results show the formation of slip bands, which increase in number as loading stress rises. The primary slip systems activated are {110} in ferrite and {111} in austenite. In the ferrite phase, slip dislocations accumulate and generate low-angle grain boundaries (LAGBs), which evolve into high-angle grain boundaries (HAGBs), refining the grain structure. Numerous Σ3 annealing twins form in the austenite phase, but detwinning and twinning reduce Σ3 content as deformation processes. Ferrite and austenite exhibit good stability during the initial stages of tensile deformation. However, some austenite transforms into martensite through the transformation-induced plasticity (TRIP) effect at the final stages of deformation, which helps relieve stress concentration and delays material fracture. This study provides valuable insights for optimizing microstructure to improve the mechanical properties of LPBF materials. © 2024 The Authors
Keyword ：
Austenite Austenite Crystal lattices Crystal lattices Duplex stainless steel Duplex stainless steel Fracture mechanics Fracture mechanics Grain boundaries Grain boundaries Plasticity testing Plasticity testing Steel powder metallurgy Steel powder metallurgy Steel testing Steel testing Tensile strength Tensile strength Tensile testing Tensile testing Transformation Induced Plasticity steel Transformation Induced Plasticity steel Yield stress Yield stress
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| GB/T 7714 | Zhao, Wei , Xiang, Hongliang , Zhan, Xianming et al. Microstructure evolution in laser powder bed fusion melted 2205 duplex stainless steel using in-situ EBSD during uniaxial tensile testing [J]. | Journal of Materials Research and Technology , 2024 , 33 : 2113-2124 . |
| MLA | Zhao, Wei et al. "Microstructure evolution in laser powder bed fusion melted 2205 duplex stainless steel using in-situ EBSD during uniaxial tensile testing" . | Journal of Materials Research and Technology 33 (2024) : 2113-2124 . |
| APA | Zhao, Wei , Xiang, Hongliang , Zhan, Xianming , Deng, Tingting , Zhang, Xiangkai , Lu, Yuemei et al. Microstructure evolution in laser powder bed fusion melted 2205 duplex stainless steel using in-situ EBSD during uniaxial tensile testing . | Journal of Materials Research and Technology , 2024 , 33 , 2113-2124 . |
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Abstract ：
Compared to duplex stainless steels (DSSs) prepared by traditional methods, specimens produced through laser powder bed fusion (LPBF) exhibit excellent yield strength but lower elongation. To improve elongation, understanding microstructure evolution during uniaxial tensile testing is crucial. This study investigates the slip behavior, grain boundary evolution, and phase transformation of LPBF 2205 duplex stainless steel during tensile deformation using in-situ electron backscatter diffraction (EBSD). Results show the formation of slip bands, which increase in number as loading stress rises. The primary slip systems activated are {110}<111> in ferrite and {111}<110> in austenite. In the ferrite phase, slip dislocations accumulate and generate low-angle grain boundaries (LAGBs), which evolve into high-angle grain boundaries (HAGBs), refining the grain structure. Numerous Sigma 3 annealing twins form in the austenite phase, but detwinning and twinning reduce Sigma 3 content as deformation processes. Ferrite and austenite exhibit good stability during the initial stages of tensile deformation. However, some austenite transforms into martensite through the transformation-induced plasticity (TRIP) effect at the final stages of deformation, which helps relieve stress concentration and delays material fracture. This study provides valuable insights for optimizing microstructure to improve the mechanical properties of LPBF materials.
Keyword ：
2205 duplex stainless steel 2205 duplex stainless steel In-situ uniaxial tensile testing In-situ uniaxial tensile testing Laser powder bed fusion Laser powder bed fusion Phase transformation Phase transformation Slip behavior Slip behavior
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| GB/T 7714 | Zhao, Wei , Xiang, Hongliang , Zhan, Xianming et al. Microstructure evolution in laser powder bed fusion melted 2205 duplex stainless steel using in-situ EBSD during uniaxial tensile testing [J]. | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2024 , 33 : 2113-2124 . |
| MLA | Zhao, Wei et al. "Microstructure evolution in laser powder bed fusion melted 2205 duplex stainless steel using in-situ EBSD during uniaxial tensile testing" . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 33 (2024) : 2113-2124 . |
| APA | Zhao, Wei , Xiang, Hongliang , Zhan, Xianming , Deng, Tingting , Zhang, Xiangkai , Lu, Yuemei et al. Microstructure evolution in laser powder bed fusion melted 2205 duplex stainless steel using in-situ EBSD during uniaxial tensile testing . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2024 , 33 , 2113-2124 . |
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In this paper, the PC/ABS notebook computer shells with PET film were prepared using a combined in-mold decoration and microcellular injection molding (IMD/MIM) process. Then the surface quality, morphology, impact toughness and wear resistance were investigated. The results shown that the surface quality is improved by IMD/MIM technology. The three dimensional surface roughness value (Sa) was about 1/3 of that of MIM parts. The cross-section of IMD/MIM samples have three layers. The first layer is a PET film decoration layer with about 132 mu m thickness, followed by skin layer (about 22 mu m) and foam layer. The range of thickness of the foam layer for the different specimens is about 7803 mu m-7820 mu m.The cell diameter is between 0.532 mu m and 0.638 mu m, which is about 2 times than that of MIM parts. Compared with MIM parts, the shape of the bubbles of IMD/MIM parts is ellipsoid with thinner wall. Moreover, the impact toughness of IMD/MIM parts are higher. The best impact toughness is 21.02 KJ/m2 within the scope of this experiment, which is 74% higher than the corresponding MIM part under the same foaming process. This may due to the PET film and micropores could block the initiation of the tip crack. Meanwhile, the IMD/MIM parts have excellent wear resistance property. In most cases, the wear rate of IMD/MIM parts is about 36.6% of MIM part under the same condition.
Keyword ：
impact impact In-mold decoration In-mold decoration microcellular plastic microcellular plastic notebook computer shell notebook computer shell polycarbonate/acrylonitrile-butadiene-styrene blend polycarbonate/acrylonitrile-butadiene-styrene blend surface roughness surface roughness wear resistance wear resistance
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| GB/T 7714 | Lu, Yuemei , Liu, Jianren , Wang, Liandeng . Morphology and properties of PC/ABS notebook computer shell prepared by a combined in-mold decoration and microcellular injection molding process [J]. | JOURNAL OF CELLULAR PLASTICS , 2024 , 60 (3) : 153-168 . |
| MLA | Lu, Yuemei et al. "Morphology and properties of PC/ABS notebook computer shell prepared by a combined in-mold decoration and microcellular injection molding process" . | JOURNAL OF CELLULAR PLASTICS 60 . 3 (2024) : 153-168 . |
| APA | Lu, Yuemei , Liu, Jianren , Wang, Liandeng . Morphology and properties of PC/ABS notebook computer shell prepared by a combined in-mold decoration and microcellular injection molding process . | JOURNAL OF CELLULAR PLASTICS , 2024 , 60 (3) , 153-168 . |
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Abstract ：
"金属学及热处理"是材料成型与控制工程专业人才培养的核心课程,在教学实践中,通过精选案例,把科学精神、工程伦理、实践能力、自主学习的思政元素融合在课程教学中,运用导学式、沉浸式、体验式和平台式"四式"教学方法,实现专业课程的知识传授、能力培养与价值引领相结合的人才培养目标,更好地落实立德树人的根本任务.
Keyword ：
"四式"教学法 "四式"教学法 课程思政 课程思政 金属学及热处理 金属学及热处理
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| GB/T 7714 | 卢月美 , 邓将华 , 邓丽萍 . 课程思政融入"金属学及热处理"教学的实践探索 [J]. | 机电技术 , 2023 , (2) : 111-113 . |
| MLA | 卢月美 et al. "课程思政融入"金属学及热处理"教学的实践探索" . | 机电技术 2 (2023) : 111-113 . |
| APA | 卢月美 , 邓将华 , 邓丽萍 . 课程思政融入"金属学及热处理"教学的实践探索 . | 机电技术 , 2023 , (2) , 111-113 . |
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文章通过正交试验方法研究了基于熔融沉积成型3D打印的打印速度、打印温度以及打印层厚等工艺参数对聚乳酸试样力学性能的影响规律。研究结果表明：基于抗拉强度、延伸率及冲击韧性的综合考虑，本试验范围内的最佳3D打印参数为打印速度90 mm/s、打印温度210℃、打印层厚0.20 mm，其抗拉强度可达13.218 MPa，延伸率为4.604%，冲击韧性达1.92 kJ/m2。
Keyword ：
强度 强度 打印参数 打印参数 熔融沉积成型 熔融沉积成型 聚乳酸 聚乳酸 韧性 韧性
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| GB/T 7714 | 伍烨 , 吴涵群 , 吴锦熙 et al. 基于力学性能的聚乳酸3D打印工艺参数优化 [J]. | 机电技术 , 2022 , 4 (02) : 43-46 . |
| MLA | 伍烨 et al. "基于力学性能的聚乳酸3D打印工艺参数优化" . | 机电技术 4 . 02 (2022) : 43-46 . |
| APA | 伍烨 , 吴涵群 , 吴锦熙 , 吴俊龙 , 卢月美 . 基于力学性能的聚乳酸3D打印工艺参数优化 . | 机电技术 , 2022 , 4 (02) , 43-46 . |
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Abstract ：
"金属学及热处理"是一门核心专业基础课程,具有内容多、概念抽象、知识点分散、理论联系实践强等特点;传统的线下教学模式缺乏活力,效果不佳。文章探索了线上线下混合式教学新模式,建立多元评价体系,创建以学为中心的教学模式,增强学生学习自主性;通过强化实践创新能力的培养,增强学生学习获得感。教学实践表明:这种混合式教学模式可提升课程的挑战度、广度及深度,多维度培养学生,提升人才培养质量。
Keyword ：
以学为中心 以学为中心 混合式教学 混合式教学 线上线下 线上线下 金属学及热处理 金属学及热处理
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| GB/T 7714 | 卢月美 , 邓丽萍 . 线上线下混合式教学的实践探索——以“金属学及热处理”课程为例 [J]. | 机电技术 , 2021 , (06) : 112-113 . |
| MLA | 卢月美 et al. "线上线下混合式教学的实践探索——以“金属学及热处理”课程为例" . | 机电技术 06 (2021) : 112-113 . |
| APA | 卢月美 , 邓丽萍 . 线上线下混合式教学的实践探索——以“金属学及热处理”课程为例 . | 机电技术 , 2021 , (06) , 112-113 . |
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本发明涉及一种聚乳酸复合材料模型构建及性能预测方法，包括：S1)构建聚乳酸分子链，进行几何优化；S2)构建不同长度的碳纳米管模型，在其外表面接枝官能团，构建碳纳米管模型和官能化碳纳米管模型；S3)搭建纯聚乳酸材料、碳纳米管/聚乳酸复合材料、官能化碳纳米管/聚乳酸复合材料无定型晶胞；S4)对建立好的模型进行能量最小化和分子动力学驰豫计算；S5)计算晶胞模型力学性能参数；通过改变晶胞的边长达到拉伸目的展示应力应变关系，分析材料拉伸性能；对比分析相同温度、压强条件下三种材料模拟的力学性能参数和应力应变关系，得到预测结果。该方法有利于便捷、准确地预测聚乳酸复合材料的性能，降低实验成本，缩短研发周期。
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| GB/T 7714 | 卢月美 , 白建平 . 一种聚乳酸复合材料模型构建及性能预测方法 : CN202010881982.5[P]. | 2020/8/28 . |
| MLA | 卢月美 et al. "一种聚乳酸复合材料模型构建及性能预测方法" : CN202010881982.5. | 2020/8/28 . |
| APA | 卢月美 , 白建平 . 一种聚乳酸复合材料模型构建及性能预测方法 : CN202010881982.5. | 2020/8/28 . |
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Microcellular plastics not only have excellent performance, but also can form thin-walled parts. In the paper, the thin-walled microcellular parts (notebook computershell) made of polycarbonate/acrylonitrile-butadiene-styrene blends (PC/ABS) were prepared by foam injection molding with supercritical nitrogen. The morphologies were observed by optical microscope, scanning electron microscope, and optical profiler. The properties (macro-density, impact toughness, thermal conductivity) of the samples were further studied. The results showed that the average cell diameter of the PC/ABS foam was 0.401 mu m. The cell density reached 3.25 x 10(12) cell/cm(3). Compared with unfoamed part, the macro-density of the microcellular part was reduced by 10.9%. Impact toughness of the polycarbonate/acrylonitrile-butadiene-styrene blend (PC/ABS) foam reached 19.9 kJ/m, approximately 2.7 times as great as that of unfoamed part. This may be ascribed that microcellular structure could absorb impact energy resulting in the improvement of toughness. The microcellular structure could also reduce thermal conductivity of the PC/ABS foam. In short, the thin-walled microcellular PC/ABS part with light weight and good toughness could be formed by injection molding with supercritical nitrogen.
Keyword ：
ABS) ABS) acrylonitrile-butadiene-styrene blends (PC acrylonitrile-butadiene-styrene blends (PC injection molding injection molding Microcellular plastic Microcellular plastic polycarbonate polycarbonate supercritical nitrogen supercritical nitrogen thin-walled thin-walled
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| GB/T 7714 | Lu, Yuemei , Yang, Mengjin , Liu, Jianren . Morphology and properties of thin-walled microcellular polycarbonate/acrylonitrile-butadiene-styrene blend foam [J]. | JOURNAL OF CELLULAR PLASTICS , 2019 , 55 (4) : 421-432 . |
| MLA | Lu, Yuemei et al. "Morphology and properties of thin-walled microcellular polycarbonate/acrylonitrile-butadiene-styrene blend foam" . | JOURNAL OF CELLULAR PLASTICS 55 . 4 (2019) : 421-432 . |
| APA | Lu, Yuemei , Yang, Mengjin , Liu, Jianren . Morphology and properties of thin-walled microcellular polycarbonate/acrylonitrile-butadiene-styrene blend foam . | JOURNAL OF CELLULAR PLASTICS , 2019 , 55 (4) , 421-432 . |
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采用熔融挤出注射成型法制备不同碳纳米管(CNTs)用量的碳纳米管/马来酸酐接枝聚丙烯(PPG)/高密度聚乙烯(HDPE) (CNTs/PPG/HDPE)复合材料;研究了复合材料在水润滑工况,50N和150N载荷条件下的摩擦性能;并观察了CNTs的分布及磨损表面形貌和表面粗糙度.结果 表明:CNTs的加入可以有效减轻磨损,在50N和150N的不同载荷条件下,添加1.2％(wt,质量分数)CNTs的CNTs/PPG/HDPE在水润滑摩擦工况条件下都具有低较的磨损率,并能防止剥落的发生.在150N载荷,水润滑条件下,CNTs用量为1.2％(wt,质量分数)制得的CNTs/PPG/HDPE的摩擦系数最小值为0.161,磨损率为0.932×10-5mm3/N·m,粗糙度为2531nm,具有较好的摩擦性能.
Keyword ：
摩擦行为 摩擦行为 水润滑 水润滑 碳纳米管 碳纳米管 高密度聚乙烯 高密度聚乙烯
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| GB/T 7714 | 卢月美 , 施企明 , 刘建仁 et al. CNTs对HDPE基复合材料在水润滑工况下摩擦行为影响的研究 [J]. | 化工新型材料 , 2019 , 47 (5) : 131-134 . |
| MLA | 卢月美 et al. "CNTs对HDPE基复合材料在水润滑工况下摩擦行为影响的研究" . | 化工新型材料 47 . 5 (2019) : 131-134 . |
| APA | 卢月美 , 施企明 , 刘建仁 , 杨孟进 . CNTs对HDPE基复合材料在水润滑工况下摩擦行为影响的研究 . | 化工新型材料 , 2019 , 47 (5) , 131-134 . |
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采用熔融共混法制备了多壁碳纳米管/马来酸酐接枝聚丙烯/聚丙烯复合材料.利用差示扫描量热仪测试复合材料的非等温结晶过程,并对热分析结果进行拟合计算;采用偏光显微镜观察复合材料的晶粒形貌及测量晶粒度.结果表明:多壁碳纳米管的加入提高了复合材料的结晶温度,加快了结晶速率,细化了晶粒,并且使晶粒尺寸更加均匀.
Keyword ：
多壁碳纳米管 多壁碳纳米管 晶粒细化 晶粒细化 结晶温度 结晶温度 结晶速率 结晶速率 聚丙烯 聚丙烯
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| GB/T 7714 | 邱大程 , 巫河峰 , 卢宗振 et al. 碳纳米管对聚丙烯基复合材料结晶的影响研究 [J]. | 机电技术 , 2018 , (2) : 52-53,70 . |
| MLA | 邱大程 et al. "碳纳米管对聚丙烯基复合材料结晶的影响研究" . | 机电技术 2 (2018) : 52-53,70 . |
| APA | 邱大程 , 巫河峰 , 卢宗振 , 饶万桁 , 卢月美 . 碳纳米管对聚丙烯基复合材料结晶的影响研究 . | 机电技术 , 2018 , (2) , 52-53,70 . |
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