Ti,Nb对17%Cr铁素体不锈钢焊接热影响区组织的影响  

Effect of Ti and Nb contents on heat affected zone microstructure of 17%Cr ultra-purified ferrite stainless steels

作　　者：吴昌忠[1] 单亚廷[1] 罗兴宏[1] 范闽宁[1] 钱百年[1] 李鹏伟 张明铭[2] 

机构地区：[1]中国科学院金属研究所,沈阳市110016 [2]辽宁忠旺集团有限公司工程技术研究中心,辽阳市111003

出　　处：《焊接》2013年第8期22-25,70,共4页Welding & Joining

基　　金：国家自然科学基金资助项目(50734002)

摘　　要：利用Gleeble-1500热模拟试验机对Ti,Nb微合金化的17%Cr超纯铁素体不锈钢(UP-FSS)进行了不同峰值温度下的热模拟试验,研究了焊接热影响区组织及其变化规律。结果表明:焊接热循环的峰值温度对铁素体晶粒长大有显著的影响,Nb合金化的不锈钢HAZ晶粒细化作用最强,Ti和Ti+Nb合金化的不锈钢HAZ晶粒细化作用较好,Ti,Nb与钢中的C、N形成的第二相粒子的大小、形态、分布和数量的变化是造成焊接热影响区组织变化的主要原因。The microstructure of the coarse-grained welding heat-affected zone(HAZ) of 17%Cr ultra-purified ferrite stainless steels by adding Ti and Nb microalloy element were investigated with different peak temperature thermal simulation using Gleeble-1500 thermal simulator.The results show that the peak temperature has great effect on the grain growth of ferrite in HAZ,and the grain refining by adding Nb in steel is strongest and that by adding Ti or Ti+Nb is comparatively weak.The reason of changing HAZ microstructure is variation of size,kind,distribution and number of the second phase particle.

关 键 词：超纯铁素体不锈钢 微合金元素 晶粒细化 焊接热影响区 第二相粒子 

分 类 号：TG457.11[金属学及工艺—焊接]