低碳低合金钢焊缝金属的显微组织及其影响因素  

MICROSTRUCTURE OF WELD METAL OF LOW-CARBON AND LOW-ALLOY STEELS AND INFLUENCING FACTORS

作　　者：杜则裕[1] 张德勤[1] 田志凌[2] 

机构地区：[1]天津大学 [2]钢铁研究总院

出　　处：《钢铁》1999年第12期67-71,共5页Iron and Steel

基　　金：国家重点基础研究项目

摘　　要：低碳低合金钢焊缝金属的显微组织基本上包括先共析铁素体、针状铁素体、侧板条铁素体、少量的粒状贝氏体和马氏体。分析了这些组织的形成条件及特点，焊缝金属化学成分和冷却速度是影响焊缝金属组织的主要因素，阐述了各种组织的形核位置。低碳低合金钢焊缝金属最理想的组织是获得大于６５ ％ 的针状铁素体，其平均板条尺寸约为１ μｍ 。In general,the microstructure of weld metal of the low carbon and low alloy steels consists of pre eutectoid ferrite,acicular ferrite,side plate ferrite and some granular bainite and martensite.The transformation conditions and nature of the microstructure are analyzed in a systematic way in this paper.The main influencing factors of the microstructure in weld metal are composition and cooling rate of the weld metal.The sites for nucleation of different phases are expounded in the weld metal of the low carbon and low alloy steel,the best combination of properties is obtained when there is more than 65 % of acicular ferrite and the average lath size is about 1 μm.

关 键 词：低合金钢 焊缝金属 显微组织 针状铁素体 

分 类 号：TG457.11[金属学及工艺—焊接]