摘要
以316不锈钢为材料,探讨了平行往复、“十”字正交、插补堆积三种不同路径下TIG电弧增材试件微观组织及力学性能的差异.结果表明,三组试件中部组织存在明显差异,平行往复试件树枝晶粗大发达,生长方向高度一致.“十”字正交试件树枝晶生长方向多,枝晶紊乱,层间过渡区域大.插补堆积试件二次枝晶不发达,组织细密.在显微硬度方面,三组试件的维氏硬度自底板至顶部呈现先减小后增大的趋势,平行往复试件显微硬度最大.在拉伸性能方面,平行往复试件纵向抗拉强度最高,纵向受力时可采用该方式增材.插补堆积试件横向抗拉强度最高,横向受力时可采用该方式增材.“十”字正交试件力学性能表现出各向同性,多向受力且对塑性要求较高时可采用该方式增材.
Using 316 stainless steel as the material,the differences in the microstructure and mechanical properties of additive manufacturing specimens by three paths of parallel reciprocating,cross shaped and insert stacking were discussed.The results indicated that there were obvious differences in the microstructure in middle areas of the three specimens.The dendrites of the parallel reciprocating specimen were coarse and developed,and the growth direction was uniform.The cross shaped specimen,with disordered dendrites,not only had many dendrite growth directions but also had a large interlayer transition zone.The secondary dendrite of the insert stacking specimen was not developed and the microstructure was fine.In terms of microhardness,the Vickers hardness of the three specimens decreased first and then increased from the bottom to the top.The microhardness of the parallel reciprocating specimens was the largest.In terms of tensile properties,the longitudinal tensile strength of the parallel reciprocating specimen was the highest,and this path could be used when subjected to longitudinal force.Insert stacking specimen had the highest transverse tensile strength,and this path could be used when subjected to transverse forces.The mechanical properties of the cross shaped specimen showed isotropy,which was beneficial to be used in the case of multi-directional stress and high plastic requirements.
作者
刘黎明
贺雅净
李宗玉
张兆栋
LIU Liming;HE Yajing;LI Zongyu;ZHANG Zhaodong(Key Laboratory of Liaoning Advanced Welding and Joining Technology,Dalian University of Technology,Dalian,116024,China)
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2020年第12期13-19,I0001,I0002,共9页
Transactions of The China Welding Institution
基金
国家重点研发计划(2018YFB1107900)
大连市高层次人才创新支持计划项目(2017RQ102).
关键词
路径
增材制造
316不锈钢
组织性能
paths
additive manufacturing
316 stainless steel
microstructure and mechanical properties
