Ca系氧化物冶金工艺对夹杂物及组织的影响  

The effect of Ca oxide metallurgy on inclusion and metallographic structure

作　　者：王睿之 杨健[1,3] WANG Ruizhi YANG Jian(School of Metallurgy, Northeastern University, Shenyang 110819, China Central Research Institute, Baosteel Group Corporation, Shanghai 201900, China School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China)

机构地区：[1]东北大学冶金学院,辽宁沈阳110819 [2]宝山钢铁股份有限公司中央研究院,上海201900 [3]上海大学材料学院,上海200072

出　　处：《炼钢》2017年第5期39-45,共7页Steelmaking

基　　金：国家重点研发计划项目(2016YFB0300602)

摘　　要：基于实验室数据,研究了Ca系氧化物冶金工艺中Ca含量对大线能量焊接热影响区夹杂物和组织的影响。与传统工艺相比,Ca系氧化物冶金工艺微米夹杂物的密度增加,平均尺寸减少,纳米夹杂物密度增加60%,平均尺寸减小25%,热影响区组织由传统工艺的粗大原奥氏体晶粒和魏氏组织为主转变为细小原奥氏体晶粒和晶内针状铁素体为主。随着Ca质量分数从4×10-6增加到27×10-6,微米夹杂物密度增加而尺寸变化不大;纳米夹杂物的密度增加尺寸变小。采用Ca系氧化物冶金工艺的50 mm厚板,大线能量焊接热影响区低温韧性提高到原来的4倍。The effect of Ca content on the evolution behavior of inclusions and metallographic structure in the HAZ was investigated based on the experimental studies. Compared the conventional steel, the density of micro-meter inclusions with Ca oxide metallurgy increased and the average size reduced. The density of nano-meter inclusions increased by 60 % and the average size reduced by 25 %. The metallographic structure in HAZ of conventional steel was Widmanstatten structure and Ca oxide metallurgy was intragranular acicular ferrite. As the content of Ca increased from 4×10-6 to 27 × 10-6, the density of micrometerinclusions increased and the average size didn＇t change much and the density of nano-meter inclusions increased, the average size reduced. The low temperature toughness of HAZ of 50 mm thick plate which produced by Ca oxide metallurgy increased at 4 times.

关 键 词：焊接热影响区 大线能量焊接 低温韧性 夹杂物 氧化物冶金 

分 类 号：TF704.1[冶金工程—钢铁冶金]