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
余海存 1张有祥 2金静 2姜昊成 2喇培清2
作者信息
- 1. 兰州理工大学材料科学与工程学院,甘肃 兰州 730050;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;兰州兰石集团有限公司铸锻分公司,甘肃 兰州 730050
- 2. 兰州理工大学材料科学与工程学院,甘肃 兰州 730050;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
- 折叠
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、M7C3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.
Abstract
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 30min 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,M7 C3 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Key words
310 S heat-resistant steel/hot rolling/solution treatment/microstructure/tensile property引用本文复制引用
基金项目
甘肃省科技重大专项(22ZD6GA008)
甘肃省高等学校产业支撑计划(GCJ2022-38)
出版年
2024
NETL
NSTL
万方数据