微Ti钢焊后冷却过程中的第二相粒子  

BEHAVIOR OF SECOND PHASE PARTICLES IN Ti MICROALLOYED STEELS DURING COOLING AFTER WELDING

作　　者：尹桂全[1] 张纯明 刘开升[3] 

机构地区：[1]安徽工业大学 [2]重庆钢铁公司 [3]马鞍山钢铁股份有限公司

出　　处：《钢铁》2002年第4期53-56,38,共5页Iron and Steel

基　　金：安徽省教育厅自然科学研究资助项目 (2 0 0 0 jl191)

摘　　要：用透射电子显微镜研究了系列微 Ti钢中焊接热模拟冷却期间第二相粒子尺寸分布参数与试样成分(钛和铌含量 )、冷却时间 t8/5以及冲击韧性的关系。试验结果表明 ,钢中细小弥散的第二相粒子对冲击韧性的改善具有重要的作用 ;焊后冷却期间 ,高温未溶的细小第二相粒子发生了溶解、长大和析出 ,皆与试样成分及冷却时间有关。 Ti- Nb钢中的第二相粒子 (Ti,Nb) N的稳定性不如 Ti钢中的 Ti N。 Ti、Nb复合微合金化对焊后韧性的改善作用不如仅用微The relationship of size, distribution of second phase particles and composition (Ti and Nb contents), cooling time t 8/5 after simulated weld thermal cycle and impact toughness in Ti microalloy steels were studied by transmission electron microscopy (TEM). The results show that the fine and dispersed second phase particles play an important part in improvement of toughness after welding. During cooling after welding the dissolution, growth and precipitation of particles was occurred and these processes were correlative with composition and cooling time. The stability of (Ti,Nb)N particles in Ti Nb steels was less than TiN particles in Ti steel. For toughness improvement, the combined microalloy with Ti and Nb is inferior to microalloy with Ti only.

关 键 词：冷却过程 微Ti-Nb钢 焊接 冷却时间 第二相粒子 冲击韧性 钛钢 

分 类 号：TG401[金属学及工艺—焊接]