热成形和热处理对3.5Ni钢拼接焊缝力学性能的影响  

Effect of hot forming and heat treatment on mechanical properties of 3.5Ni steel butt weld

作　　者：南东国 鲁果昌 隋力 翟长峰 张骥 丛轶 马伯林 

机构地区：[1]大连中集重化装备有限公司,116600

出　　处：《焊接》2014年第11期55-59,70-71,共5页Welding & Joining

基　　金：中集安瑞科集团制造技术创新计划项目(PE-FR-2011-P-009)

摘　　要：研究了不同厚度3.5 Ni钢的焊接试板在经历和产品同样温度的热成形加热及同样条件的冷却后,焊缝组织结构和力学性能的变化。通过适当规范的热处理,可使经历高温热过程的焊缝组织和力学性能达到母材同样的水平,为避免在高温成形后刨去焊缝重新焊接造成的焊接材料和能源、工时浪费提供了工艺依据。The welded 3.5%-Ni steel plates subjected to the different hot processing were tested.It is proved that high temperature in the hot forming process can significantly reduce the mechanical properties and have the great influence on the microstructure of weld metal and HAZ.And subsequently additional heat treatments that are equivalent to normalization and tempering could eliminate these harmful effects and make both the properties and structure be restored and even improved.This result provides a reliable basis for the manufacturing of low-temperature steel products.

关 键 词：3.5NI钢 拼接焊缝 热成形温度 热处理制度 力学性能 

分 类 号：TG47[金属学及工艺—焊接]