摘要
为调控SLM制备316L不锈钢(316L-SLM)的综合性能,研究了不同扫描速度下的316L-SLM组织性能,分析了不同扫描速度和热处理温度下316L-SLM在PBS溶液中的耐腐蚀性。结果表明,扫描速度小于900 mm/s时,其变化对致密度影响较小,扫描速度大于900 mm/s后,随扫描速度增大致密度呈下降趋势。逐层旋转67°扫描在试验截面上形成周期性变化的焊道轮廓形貌。高扫描速度下试样抗压缩性能更强,弹性模量更高;低扫描速度下试样抗拉伸性能更强,延伸率更高;650℃和1 050℃热处理试样组织仍为粗大柱状晶,1 050℃热处理试样柱状晶宽度略有增大,两种热处理试样中焊道轮廓鱼鳞纹形貌仍清晰可见。两种热处理方式明显改善了耐腐蚀性,其中1 050℃热处理时的改善幅度更大。缺陷和敏化是腐蚀行为主控因素。扫描速度增大,敏化倾向减小,缺陷倾向增大。因此扫描速度增大时316L-SLM试样耐腐蚀性先增大后减小,试验条件下900 mm/s时的耐腐蚀性最好。
In order to control the comprehensive properties of 316L stainless steel(316L-SLM)prepared by SLM,the microstructure and properties of 316L-SLM at different scanning speeds were studied,and the corrosion resistance of 316L-SLM in PBS solution was analyzed at different scanning speeds and heat treatment temperatures.The results show that when the scanning speed is less than 900 mm/s,it has little influence on relative density and microhardness,but when the scanning speed is more than 900 mm/s,the density and microhardness decrease with the increase of scanning speed.Scanning by inter-layer rotation of 67°produced periodic patterns of weld profile on the cross section.The specimen has stronger compression resistance and higher elastic modulus when high scanning speed is used.The specimens has stronger tensile properties and higher elongation when low scanning speed is employed.The microstructure of the samples treated at 650℃ and 1050℃ has coarse colum*nar crystal,while the width of the columnar crystal of the samples treated at 1050℃ slightly increases.The contour of the weld bead and the morphology of fish scale pattern are clearly observed in the samples treated at 650℃ and 1050℃.Both heat treatments significantly improve the corrosion resistance,especially at 1050℃.Defects and sensitization are the main controlling factors of corrosion behavior.With the increase of scanning speed,sensitization tendency decreases and defect tendency increases.Therefore,the corrosion resistance of 316L-SLM sample increases first and then decreases when the scanning speed increases,and the corrosion resistance is the best when the scanning speed is 900 mm/s.
作者
解妙霞
辛琪珂
李焱鑫
张林杰
Xie Miaoxia;Xin Qike;Li Yanxin;Zhang Linjie(Xi'an University of Architecture and Technology,Xi'an 710311,Shaanri,China;Xian Jiaotong UUniversity,Xi'an 710049,Shaanri,China)
出处
《应用激光》
CSCD
北大核心
2023年第10期10-21,共12页
Applied Laser
基金
国家重点研发计划(2018YFB1105800)。
关键词
选区激光熔化
316L不锈钢
耐腐蚀性能
扫描速度
热处理
selectivelasermelting
316Lstainless steel
corrosionresistance
scanning speed
heat treatment
作者简介
解妙霞(1977-),博士,副教授。研究方向为基于增材制造的结构振动特性设计研究。Email:xiemiaoxia@xauat.edu.cn;通信作者:张林杰(1973-),男,博士,教授。研究方向为激光焊接及增材制造。E-mail:zhanglinjiexjtu.edu.cn。
