摘要
以纯镍粉末为原料,通过激光选区熔化探究制备镍实体的优化工艺参数,研究了在一定铺粉层厚和扫描间距下,线能量密度对镍实体的致密度、显微组织、力学性能以及电化学性能的影响。结果显示:在线能量密度为244.8 J/m参数下,激光选区熔化(SLM)成形镍实体的综合性能最佳。该条件下成形件表面平整,表面粗糙度为10.5μm,致密度为99.7%,维氏硬度为165.4 HV0.2,抗拉强度为420 MPa,屈服强度为321 MPa,伸长率为23.2%,断口为韧性断口。在质量分数ω(NaOH)=20%溶液中析氢反应自腐蚀电位为-1.5×10^-6 mA·cm^-2,其极化钝化区域为-1.038~0.442 V。
The pure Ni samples were formed by selective laser melting technology.The influences of linear energy density on the density,microstructure,mechanical properties,and electrochemical properties of nickel solid were investigated under a certain layer thickness and hatch distance.The results indicated that under the linear laser energy density of 244.8 J/m,the comprehensive performance of formed part was the best.Under this condition,the surface of the formed parts was smooth,the surface roughness was 10.5μm,the density was 99.7%,the microhardness was 165.4 HV0.2,the tensile strength reached 420 MPa,the yield strength was 321 MPa,the elongation was 23.2%,and the fracture was ductile.In the solution with mass fraction ω(NaOH)=20%,the self-corrosion potential of hydrogen evolution reaction was-1.5×10^-6 mA·cm^-2,and the polarization passivation region was from -1.038 V to 0.442 V.
作者
赵昀
赵国瑞
马文有
郑黎
刘敏
Zhao Yun;Zhao Guorui;Ma Wenyou;Zheng Li;Liu Min(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang,Liaoning 110870,China;National Key Laboratory for Modern Materials Surface Engineering Technology,Key Laboratory of Guangdong for Modern Surface Engineering Technology,Guangdong Institute of New Materials,Guangzhou,Guangdong 510651,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2020年第17期178-189,共12页
Laser & Optoelectronics Progress
基金
广东省科学院实施创新驱动发展能力建设专项资金项目(2019GDASYL-0502006,2018GDASCX-0946,2019GDASYL-0402004,2018GDASCX-0402,2019GDASYL-0402006,2018GDASCX-0111)
广东省省级科技计划项目(2016A030312015,2017A070701027,2017A070702016,2017B030314122,2014B070705007)。
关键词
激光光学
选区激光熔化
镍
工艺
缺陷
显微组织
laser optics
selective laser melting
nickel
process
defects
microstructure
