热处理对选区激光熔化马氏体不锈钢腐蚀行为及组织的影响
Effect of heat treatment on corrosion behavior and microstructure of martensitic stainless steel prepared by selective laser melting
周海萍 1王中伟 1张弘斌 1秦升学 1刘杰 1韩志豪 1王晓广1
作者信息
- 1. 山东科技大学机械电子工程学院,山东 青岛 266590
- 折叠
摘要
采用光学显微镜、电子背散射衍射技术、透射电镜和电化学测试等研究了热处理对选择性激光熔化(SLM)制备的Corrax(CX)不锈钢微观组织和腐蚀行为的影响.首先对 SLM CX 不锈钢进行了 900℃固溶处理 1 h,随后在不同温度(430～630℃)下时效处理 3 h.结果表明,热处理后SLM CX试样的相对密度达到 99%以上,具有较好的致密化效果.电化学测试结果表明,时效温度的选择对 SLM CX试样的耐腐蚀性影响较大,试样表面的腐蚀痕迹得到一定程度的改善.530℃时效试样的相对密度最大(99.72%),耐蚀性最好,腐蚀电位最高(-0.1851±0.013 V),腐蚀电流密度最小(0.1203±0.011 μA·cm-2).热处理后SLM CX试样的耐蚀性受相对密度、晶粒尺寸、晶界特征分布以及NiAl颗粒沉淀析出的协同影响.
Abstract
Effect of heat treatment on microstructure and corrosion behavior of Corrax(CX)stainless steel prepared by selective laser melting(SLM)was studied by means of optical microscope,electron backscatter diffraction technique,transmission electron microscopy and electrochemical testing.Firstly,SLM CX stainless steel was subjected to solution treatment at 900℃ for 1 h,followed by aging treatment at different temperatures(430-630℃)for 3 h.The results show that the relative density of the SLM CX samples after heat treatment reaches over 99%,indicating good densification effect.The electrochemical test results indicate that the selection of aging temperature has significant influence on the corrosion resistance of the SLM CX samples,and the corrosion traces on the surface of the samples have been improved to certain extent.The sample aged at 530℃ has the highest relative density(99.72%),the best corrosion resistance,the highest corrosion potential(-0.1851±0.013 V),and the lowest corrosion current density(0.1203±0.011 μA·cm-2).The corrosion resistance of the SLM CX samples after heat treatment is synergistically affected by relative density,grain size,grain boundary characteristic distribution and NiAl particle precipitation.
关键词
选择性激光熔化/Corrax(CX)不锈钢/热处理/腐蚀行为/显微组织Key words
selective laser melting/Corrax(CX)stainless steel/heat treatment/corrosion behavior/microstructure引用本文复制引用
基金项目
山东省自然科学基金面上项目(ZR2021ME234)
出版年
2024
NETL
NSTL
万方数据