含铜301奥氏体不锈钢高温组织原位观察  

In situ observation of high-temperature microstructure of Cu-bearing 301 austenitic stainless steel

作　　者：李怡轩 李娜[1] 马永会 姜正义 LI Yixuan;LI Na;MA Yonghui;JIANG Zhengyi(School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,China;Test Center,Ji Hua Laboratory,Foshan 528200,China;School of Mechanical,Materials,Mechatronic and Biomedical Engineering,University of Wollongong,Wollongong 2522,Australia)

机构地区：[1]辽宁科技大学材料与冶金学院,辽宁鞍山114051 [2]季华实验室测试中心,广东佛山528200 [3]伍伦贡大学机械、材料、机电与生物医学工程学院,新南威尔士州伍伦贡2522

出　　处：《辽宁科技大学学报》2025年第1期7-12,共6页Journal of University of Science and Technology Liaoning

基　　金：国家自然科学基金资助项目(52274338)。

摘　　要：在301奥氏体不锈钢中分别添加不同质量分数的铜,利用高温激光共聚焦显微镜对含铜不锈钢进行原位组织观察。结果表明,较低温度(<1 300℃)下,晶粒尺寸随着铜质量分数的增加而增大;较高温度(>1 300℃)下,各实验钢中都迅速形成较大晶粒,大晶粒的尺寸随着铜质量分数的增加而减小,同时晶粒尺寸的均匀性显著提高。与常规301不锈钢相比,含铜钢的高温δ铁素体的形成温度提高约100℃,说明铜显著扩大了奥氏体相区,提高了奥氏体的稳定性。含铜301不锈钢的熔化温度高于常规301不锈钢,晶界的熔化温度随铜质量分数的增加而显著提高,因此在热加工过程中未出现铜脆缺陷。Different amounts of Cu were added to 301 austenitic stainless steel,and the in-situ microstructures of Cu-bearing stainless steels were observed using a high-temperature confocal laser scanning microscope.The results show that at lower temperatures(<1300℃),the grain size increases with the increase of Cu content;At higher temperatures(>1300℃),larger grains rapidly formed in all steels,and the size of these grains de-creased with increasing Cu content,while the uniformity of grain size significantly improved.Compared with normal 301 stainless steel without Cu,the formation temperatures of high-temperatureδferrite in Cu-bearing steels have increased by nearly 100℃,indicating that Cu significantly expands the austenite phase region and improves the stability of austenite.The melting temperature of Cu-bearing 301 stainless steels are higher than that of normal 301 stainless steel,and the melting temperature of grain boundaries significantly increases with the increase of Cu content.Therefore,Cu shortness would not occur during the hot processing process.

关 键 词：奥氏体不锈钢 铜 高温组织 原位观察 

分 类 号：TG14.25[一般工业技术—材料科学与工程]