退火工艺对29Cr-4Mo超级铁素体不锈钢微观组织的影响  

Effect of Annealing Process on Microstructure of 29Cr-4Mo Super Ferritic Stainless Steel

作　　者：郑世豪 解志文 宁礼奎[2] 洪国旗 刘恩泽[2] 佟健[2] 谭政[2] 李海英 郑志[2] Zheng Shihao;Xie Zhiwen;Ning Likui;Hong Guoqi;Liu Enze;Tong Jian;Tan Zheng;Li Haiying;Zheng Zhi(School of Mechanical Engineering and Automation,University of Science and Technology Liaoning,Anshan 114051,China;Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;Jiangsu FH Tube Industry Co.,Ltd,Yancheng 224199,China)

机构地区：[1]辽宁科技大学机械工程与自动化学院,辽宁鞍山114051 [2]中国科学院金属研究所,辽宁沈阳110016 [3]江苏飞鹤管业有限公司,江苏盐城224199

出　　处：《稀有金属材料与工程》2023年第8期2935-2942,共8页Rare Metal Materials and Engineering

基　　金：辽宁省科技攻关计划课题(2019JH2/10100009)。

摘　　要：以冷轧态29Cr-4Mo超级铁素体不锈钢无缝钢管为研究对象,研究了不同退火工艺对29Cr-4Mo超级铁素体不锈钢无缝钢管冷轧后微观组织的影响。结果表明,29Cr-4Mo超级铁素体不锈钢夹杂物主要成分为Cr_(2)O_(3)·MnO·Al_(2)O_(3);在900℃下保温30 min,晶界三角连接处和夹杂物附近率先生成了少量σ相,σ相析出的平均面积分数随时间的延长而增加,随温度的升高而减少;当温度升高至1000℃,保温50 min未见有σ相析出,在900~1050℃整个温度区间内未见有χ相析出;建立了Sellars模型下铁素体再结晶晶粒长大经验公式,通过对比分析计算值与实验值,结果显示该公式能准确预测整个退火过程中的平均晶粒尺寸。The effect of different annealing processes on microstructure of 29Cr-4Mo super Ferritic stainless steel seamless tube after cold rolling was investigated.The results show that the main inclusions in 29Cr-4Mo super ferritic stainless steel are Cr2O3·MnO·Al2O3.After annealing at 900°C for 30 min,the grain boundaries especially on triple junctions and near the inclusions firstly form a small amount ofσphase.The average area fraction ofσphase increases with time prolonging while decreases with the temperature rising.There is noσphase precipitating after holding for 50 min at 1000°C and noχphase in the temperature range of 900°C-1050°C.The empirical formula of ferrite recrystallization grain growth under classical Sellars model was established.The formula can accurately predict the average grain size in the whole annealing process by comparing the calculated value and the experimental value.

关 键 词：29Cr-4Mo钢 超级铁素体不锈钢 微观组织 Σ相 Sellars模型 

分 类 号：TG142.71[一般工业技术—材料科学与工程]