Effect of heat treatment on microstructure properties of austenitic stainless steel 316L using arc additive manufacturing

热处理对电弧增材制造316L不锈钢组织和性能的影响 Effect of heat treatment on microstructure properties of austenitic stainless steel 316L using arc additive manufacturing 徐亮 XU Liang 1 2 first-author 杨可 YANG Ke 1 2 王秋雨 WANG Qiuyu 1 2 冒志伟 MAO Zhiwei 1 2 刘思沾 LIU Sizhan 1 2 包晔峰 BAO Yefeng 1 2 蒋永锋 JIANG Yongfeng 1 2 河海大学机电工程学院 河海大学机电工程学院 College of Mechanical and Electrical Engineering,Hohai University College of Mechanical and Electrical Engineering,Hohai University 南通河海大学海洋与近海工程研究院 南通河海大学海洋与近海工程研究院 Nantong Ocean and Coastal Engineering Research Institute,Hohai University Nantong Ocean and Coastal Engineering Research Institute,Hohai University 采用ER316L不锈钢焊丝,在Q235A低碳钢基板上进行TIG电弧增材制造成形试验,对成形件试样分别进行1 000℃×1 h和1 200℃×1 h的热处理,研究热处理对增材制造成形件显微组织和性能的影响。结果表明,未经热处理的试样组织为奥氏体+枝晶状铁素体+M 23 C 6 析出相;经热处理后M 23 C 6 析出相发生回熔,随着温度升高析出相数量逐渐减少,导致热处理试样硬度有所降低。铁素体在热处理过程中逐渐转变为奥氏体,并且形态发生明显变化:1 000℃热处理后为条状,1 200℃热处理后为点状。对比未热处理和1 200℃热处理,1 000℃热处理后试样抗拉强度达到最高,其组织形态为奥氏体+条铁素体+少量的M 23 C 6 析出相。1 200℃热处理后主要为奥氏体组织+微量的铁素体和M 23 C 6 析出相,抗拉强度最低。 TIG arc additive manufacturing forming tests were carried out on Q235 A low carbon steel substrate using ER316L stainless steel welding wire. Heat treatment at 1 000 ℃and 1 200 ℃ was performed to study the effect of heat treatment temperature on the microstructure and properties of the parts manufactured by the additive manufacturing. The results has shown that the sample without heat treatment was expected to be austenite +dendritic ferrite +M 23 C 6 . Heat treatment can remelt the M 23 C 6 . And the quality of the M 23 C 6 decreased with the increase of temperature,which resulted in a decrease in the hardness of sample. The ferrite was gradually transformed into austenite during the heat treatment,and its morphology changed significantly:the ferrite exhibited a strip-like structure with the heat treatment at 1 000 ℃,and exhibited a spot-like structure with the heat treatment at 1200 ℃. The tensile strength of sample reached the highest after heat treatment at 1 000 ° C,and its microstructure was austenite strip ferrite +a small amount of M 23 C 6 . After heat treatment at 1 200 ℃,the microstructure of sample mainly consisted of austenite structure,a small amount of ferrite and M 23 C 6 . And the tensile strength came to the lowest. 电弧增材制造 316L不锈钢 热处理 组织 力学性能 arc additive manufacturing 316L stainless steel heat treatment microstructure mechanical properties TG156;TG142.71 国家重点研发计划资助项目(2017YFE0100100) 2022-03-08 10 50