摘要
采用焊接热模拟试验研究了四种热输入对Mg处理钢粗晶热影响区组织及低温韧性的影响。结果表明:随热输入量从50 kJ/cm增加至200 kJ/cm,粗晶热影响区的原奥氏体尺寸从134μm增加至298μm,针状铁素体含量由40.5%减小至25.9%,M-A组元平均尺寸从0.76μm增加至1.14μm,M-A组元所占比例从3.69%增加到5.50%。当热输入量超过100 kJ/cm时,晶内粒状贝氏体消失。粗晶热影响区在-20℃的冲击功由热输入量50 kJ/cm时的84 J降低至200 kJ/cm时的40 J。
The effect of four heat inputs on the microstructure and low temperature toughness of the coarse grain heat affected zone of Mg treated steel was investigated by welding thermal simulations.When the heat input increases from 50 kJ/cm to 200 kJ/cm,the prior austenite grain size increases from 134μm to 298μm,the content of acicular ferrite decreases from 40.5%to 25.9%,the size of M-A constituent increases from 0.76μm to 1.14μm,and the fraction of M-A constituent increases from 3.69%to 5.50%.The granular bainite in coarse grain heat affected zone disappears with heat input exceeding100 kJ/cm.The impact energy of the coarse grain heat affected zone at-20℃decreases from 84 J under heat input of 50 k J/cm to 40 J under heat input of 200 kJ/cm.
作者
张亚运
张宇
王纳
郭慧英
ZHANG Yayun;ZHANG Yu;WANG Na;GUO Huiying(Institute of Research of Iron and Steel,Shagang,Zhangjiagang 215625,China)
出处
《热加工工艺》
北大核心
2019年第11期165-168,共4页
Hot Working Technology
关键词
焊接热输入
Mg处理
粗晶热影响区
针状铁素体
低温韧性
heat input
Mg treatment
coarse grain heat affected zone
acicular ferrite
low temperature toughness
