Al含量对耐热钢热轧态组织及性能的作用机制  

Effect mechanism of aluminum content on microstructure and properties of heat-resistant steel in hot-rolled state

作　　者：余海存 张有祥 金静 姜昊成 喇培清[1,2] YU Haicun;ZHANG Youxiang;JIN Jing;JIANG Haocheng;LLA Peiqing(School of Material Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,Gansu,China;State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,Gansu,China;Casting and Forging Branch,Lanzhou Lanshi Group Co.,Ltd.,Lanzhou 730050,Gansu,China)

机构地区：[1]兰州理工大学材料科学与工程学院,甘肃兰州730050 [2]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050 [3]兰州兰石集团有限公司铸锻分公司,甘肃兰州730050

出　　处：《钢铁研究学报》2024年第3期348-358,共11页Journal of Iron and Steel Research

基　　金：甘肃省科技重大专项资助项目(22ZD6GA008);甘肃省高等学校产业支撑计划资助项目(GCJ2022-38)。

摘　　要：在310S耐热钢基础上加入不同质量分数的Al元素(2.46%、3.05.%、4.24%)并重新调整成分后得到耐热钢铸态板材,将其在1 200℃下进行变形量为60%的热轧处理,并在1 150℃固溶处理30 min得到耐热钢热轧板材。通过对不同Al含量的热轧板材的显微组织和微观结构进行分析,并测试了其室温拉伸性能和800℃拉伸性能。结果表明:随着Al含量增加,晶粒尺寸逐渐减小,更多Al元素在基体中固溶,细晶强化、固溶强化、M_(7)C_(3)碳化物以及细小弥散NiAl相的析出强化的共同作用致使耐热钢的室温硬度、强度增加,而伸长率减小;800℃时随Al含量增加,强度先增加后减小,而伸长率均在16%左右。After adding different contents of Al elements(2.46 wt.%, 3.05 wt.%, 4.24 wt.%) and readjusting the composition on the basis of 310S heat-resistant steel to obtain the heat-resistant steel cast sheet, it was hot rolled at 1 200 ℃ with the deformation amount of 60%, and solid solution processed at 1 150 ℃ for 30 min to obtain the heat-resistant steel hot rolled sheet. The microstructure and microstructure of the hot rolled sheets with different Al contents were analyzed, and their room temperature tensile properties and 800 ℃ tensile properties were tested. The results show that: with the increase of Al content, the grain size decreases gradually, more Al elements in the matrix solid solution, fine grain strengthening, solid solution strengthening, M_(7)C_(3) carbide and fine diffuse NiAl phase precipitation strengthening of the joint effect of the heat-resistant steel room temperature hardness, strength increases, while the elongation decreases;800 ℃ with the increase of Al content, the strength increases and then decreases, and the elongation is about 16%.

关 键 词：310 S耐热钢 热轧 固溶处理 显微组织 拉伸性能 

分 类 号：TG142.73[一般工业技术—材料科学与工程]