摘要
对激光选区熔化(Selective laser melting,SLM)成形马氏体时效钢进行固溶及500℃;时效不同时间的热处理,分析时效时间对其组织性能的影响。结果表明:SLM 18Ni300钢经固溶+时效处理后,其组织为马氏体、逆转变奥氏体和Ni_(3)(Mo,Ti)析出相,随时效时间增加,析出相数量逐渐增加并聚集长大,同时逆转变奥氏体含量增大。随时效时间的增加,其硬度和强度逐渐增加达到峰值后下降,而伸长率不断增加。SLM 18Ni300钢的最佳时效工艺为500℃×4 h。
Effect of aging time on microstructure and properties of maraging steel formed by selective laser melting( SLM) after solid solution and aging at 500 ℃ for different time was analyzed. The results show that the microstructure of the SLM 18 Ni300 steel is composed of martensite,retrograde austenite and Ni3( Mo,Ti) precipitates after solution and aging treatment. With the increase of aging time,the precipitates gradually increase and grow up,the content of reverse austenite increases,and the hardness and strength gradually increase and then decrease after reaching the peak value,while the elongation increases continuously. The optimal aging process of the SLM 18 Ni300 steel is 500 ℃ × 4 h.
作者
董福元
张明旭
侯俊峰
Dong Fuyuan;Zhang Mingxu;Hou Junfeng(School of Materials Science and Engineering,North Minzu University,Yinchuan Ningxia 750021,China;Key Laboratory of Powders&Advanced Ceramics,North Minzu University,Yinchuan Ningxia 750021,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2021年第6期88-91,共4页
Heat Treatment of Metals
基金
北方民族大学校级重点项目(KJ201901)
宁夏自然科学基金(2020AAC03249)
国家自然科学基金(51901002)。
关键词
马氏体时效钢
激光选区熔化
时效处理
显微组织
力学性能
maraging steel
selective laser melting
aging treatment
microstructure
mechanical properties
