摘要
为满足特殊注塑模具使用性能的要求,探讨了时效处理对激光选区熔化技术(Selective laser melting,SLM)制备的Fe-12Cr-9Ni-2Al-1.5Mo合金试样微观结构和机械性能的影响.结合X射线衍射仪(XRD)、扫描电子显微镜(SEM)及电子背散射衍射仪(EBSD)等材料表征手段对SLM Fe-12Cr-9Ni-2Al-1.5Mo合金试样的物相分布、微观组织结构、拉伸断口形貌进行了对比分析.结果显示:SLM制备的Fe-12Cr-9Ni-2Al-1.5Mo合金试样经时效热处理后有少量γ-Fe相(即逆转变奥氏体)形成;SLM Fe-12Cr-9Ni-2Al-1.5Mo的平均显微硬度为(353±15.2)HV_90.2)、拉伸强度为(1090.8±5.93)MPa、延伸率为(15.7±0.33)%,时效处理后,其平均显微硬度值增加了42.5%达到(503±11.8)HV_(0.2)、拉伸强度升高到(1532.7±5.96)MPa、延伸率降低为(12.3±0.82)%;SLM Fe-12Cr-9Ni-2Al-1.5Mo合金断裂机制以韧性断裂机制为主,而时效处理后的试样则以韧-脆混合断裂机制为主,时效热处理有效提高了Fe-12Cr-9Ni-2Al-1.5Mo合金的机械性能.
In order to satisfy the performance requirements of injection molds,the effects of aging treatment on the microstructure and mechanical properties of Fe-12Cr-9Ni-2Al-1.5Mo alloy samples prepared by selective laser melting(SLM)were investigated.The phase distribution,microstructure and tensile fracture morphology of SLM Fe-12Cr-9Ni-2Al-1.5Mo alloy were analyzed by XRD,SEM and EBSD.Results showed that a small amount ofγ-Fe phase(reverse transformed austenite)was formed after aging treatment.The average microhardness of SLM Fe-12Cr-9Ni-2Al-1.5Mo was(353±15.2) HV_(0.2),the tensile strength was(1090.8±5.93)MPa and the elongation was(15.7±0.33)%.After aging treatment,the average microhardness was increased by 42.5%to(503±11.8) HV_(0.2),the tensile strength also increased to(1532.7±96)MPa,but the elongation decreased to(12.3±0.82)%.The fracture mechanism of SLM Fe-12Cr-9Ni-2Al-1.5Mo alloy was mainly ductile fracture mechanism,while the fracture mechanism of aged samples was mainly ductile brittle mixed fracture mechanism.The results indicate that the aging treatment can effectively improve the mechanical properties of Fe-12Cr-9Ni-2Al-1.5Mo alloy.
作者
胡新广
褚清坤
邓朝阳
闫星辰
杨保健
HU Xin-guang;CHU Qing-kun;DENG Zhao-yang;YAN Xing-chen;YANG Bao-jian(Faculty of Intelligent Manufacturing,Wuyi University,Jiangmen 529020,China;Institute of New Materials,Guangdong Academy of Sciences,The Key Lab of Guangdong for Modern Surface Engineering Technology,National Engineering Laboratory for Modern Materials Surface Engineering Technology,Guangzhou 510650,China;College of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,China)
出处
《五邑大学学报（自然科学版）》
CAS
2021年第4期16-23,共8页
Journal of Wuyi University(Natural Science Edition)
基金
广东省科学院专项资金项目(2021GDASYL-20210102005)
广东省基础与应用基础研究基金项目(2021A1515010939,2020A1515111031)
广州市产学研协同创新重大专项“燃气轮机关键零部件表面处理及维修”
江门市科技计划项目(2019JC01012)。
