黄玉山,谭超林,马文有,代明江,邱万奇

• 1:华南理工大学材料科学与工程学院
• 2:广东省新材料研究所现代材料表面工程技术国家工程实验室广东省现代表面工程技术重点实验室

摘要(Abstract)：

用选区激光熔化(Selective laser melting,SLM)技术成型马氏体时效钢,通过正交试验优化热处理工艺,对SLM成型试样以及不同热处理后的试样进行组织和力学性能分析。结果表明:粉末以及SLM成型试样主要由马氏体以及少量的奥氏体组成,试样经过热处理后主要由针状马氏体组成。维氏硬度和拉伸试验结果表明:SLM成型试样的硬度约357 HV0.2,抗拉强度为1165 MPa,伸长率达12.4%,断口形貌表现为细小蜂窝状的韧窝,断裂形式为穿晶韧性断裂;试样经过880℃/100 min固溶处理和480℃/2 h时效处理后,硬度提高到557 HV0.2,提高了56%,抗拉强度增加到2060 MPa,增加了77%,而伸长率达到5%,断口形貌表现出明显的韧窝和第二相粒子,断裂形式为韧性断裂。热处理过程中4个因素对拉伸性能影响的顺序依次为:时效温度>固溶时间>时效时间>固溶温度。

关键词(KeyWords)： 选区激光熔化;固溶处理;时效强化;马氏体时效钢;增材制造

Abstract:

Keywords:

基金项目(Foundation): 广东省重大科技专项项目(2015B010122004);; 广东省应用型科技研发专项资金项目(2015B090920003);; 广东省科技厅省属科研机构改革创新项目(2016B070701020);广东省科技厅国际合作基地建设项目(2014B050502008);; 广州市科创委产学研协同创新重大专项对外合作项目(2016201604030028);广州市科创委产学研协同创新重大专项校地协同创新(201604040006);; 广东省科学院科研平台环境与能力建设专项资金(2016GDASPT-0102);; 中山市广东省科学院技术转移专项经费项目(2016G1FC0004)

作者(Author): 黄玉山,谭超林,马文有,代明江,邱万奇

DOI: 10.13289/j.issn.1009-6264.2017-0243

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