摘要
采用等离子弧增材贝氏体钢−316L不锈钢异种金属交织构件,该结构件整体无缺陷,成形良好,有良好的综合力学性能,突破了传统材料的“强−韧”性矛盾。通过显微组织观察和力学性能测试,研究了交织金属不同成分比例对交织结构力学性能的影响。结果表明,结构件在贝氏体钢区域的组织为板条状贝氏体和残余奥氏体,不锈钢区域主要为奥氏体和铁素体,交织部分存在重熔区,重熔区晶粒细小,其中贝氏体钢部分组织为粒状贝氏体和薄膜状的残余奥氏体,不锈钢部分组织主要为等轴晶。拉伸和冲击试验表明,随着不锈钢含量的增加,结构件的抗拉强度下降,其冲击性能上升,当不锈钢含量比较低时,其抗拉强度达到1200 MPa以上,断后伸长率为9.5%,平均冲击吸收能量为159.25 J/cm^(2),具有良好的强韧性,冲击断口为韧性断裂。
The plasma-arc additive bainitic steel-316L stainless steel dissimilar metal interleaved component has no defects,good forming and good comprehensive mechanical properties,which breaks through the“strong-tough”limitation of traditional materials.The relationship between microstructures and mechanical properties of interleaved components was studied through microstructure observation and mechanical properties testing.The results show that the microstructure of the structural parts in the bainitic steel area is strip bainite and residual austenite,the stainless steel area is mainly composed of austenite and ferrite,and there is a remelting zone with fine grain in the interwoven part.the microstructure of the bainite steel part in the remelting zone is granular bainite and thin-film residual austenite,and the microstructure of the stainless steel part is mainly equiaxed crystal.Tensile and impact experiments show that the increase of stainless steel content in structural parts leads to the reduction of tensile strength and the improvement of impact performance.When the content of stainless steel is relatively low,the tensile strength is higher than 1200 MPa,the elongation after fracture is 9.5%,and the average impact absorbed energy is 159.25 J/cm^(2),it has good strength and toughness,and the impact fracture is ductile fracture.
作者
周凡
顾介仁
王克鸿
Zhou Fan;Gu Jieren;Wang Kehong(Key Laboratory of Intelligent Additive Technology for Controlled Arc,Ministry of Industry and Information Technology,Nanjing University of Science and Technology,Nanjing 210094,China;Beijing North Vehicle Group Co.,Ltd.,Beijing 100072,China)
出处
《焊接》
北大核心
2023年第1期16-21,共6页
Welding & Joining
基金
高性能大型金属构件高效高精度增材制造与应用示范。
关键词
等离子弧
异质异构
贝氏体钢-不锈钢
微观组织
力学性能
plasma arc
heteroisomerism
bainitic steel-stainless steel
microstructure
mechanical property
