摘要
研究了水冷和空冷条件下高氮不锈钢焊缝金属微观组织和力学性能的变化规律,讨论了冷却速率对高氮不锈钢焊缝微观组织和力学性能的影响规律.结果表明,冷却速率增加能够有效增加高氮钢焊缝金属中的氮含量,尤其对于含氮量0.85%的高氮含量焊丝,增氮效果更明显.冷却速率增加对高氮钢焊缝金属抗拉强度提高程度取决于焊丝中的氮含量,对于低氮含量高氮钢焊丝,冷却速率增加能够显著提高焊缝金属抗拉强度,当焊丝中氮含量超过0.58%时,冷却速率增加对焊缝金属抗拉强度影响不大,最终接头强度达到850 MPa.
The micro-structure and mechanical properties of high nitrogen stainless steel weld metals prepared under air and water cooling conditions were investigated and the effect of cooling rate on the micro-structure and mechanical properties of high nitrogen stainless steel weld metal was discussed in this study.The results indicated that an increase in the cooling rate would significantly increase the nitrogen content in the high nitrogen stainless steel weld metal,especially for the one with nitrogen content of 0.85%.Increasing cooling rate could result in the increase in the tensile strength of high nitrogen stainless steel weld metal,which was found to be strongly dependent on the nitrogen content in high nitrogen stainless steel weld wire.For the lower nitrogen content of high nitrogen austenitic stainless steel welding wire,increasing cooling rate could significantly improve the tensile strength of weld metal,but had no influence on the one of weld metal when the nitrogen content beyond 0.58%in the welding wire.The tensile strength of the joint reached 850 MPa finally.
作者
明珠
王克鸿
王伟
王有祁
MING Zhu;WANG Kehong;WANG Wei;WANG Youqi(Nanjing University of Science and Technology,Nanjing 210094,China;Ningbo Branch of China Academy of Ordnance Science,Ningbo 315103,China)
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2019年第10期31-35,I0002,共6页
Transactions of The China Welding Institution
基金
总装备部预先研究项目(JSCG2017606B005)
关键词
高氮不锈钢
焊接
冷却速率
微观组织
力学性能
high nitrogen stainless steel
welding
cooling rate
microstructure
mechanical properties
