回火工艺对700 MPa高强钢性能和组织的影响  

EFFECT OF TEMPERING PROCESS ON PROPERTIES AND MICROSTRUCTURE OF 700 MPa GRADE HIGH STRENGTH STEEL

作　　者：康海军 张伟 于立伟 Kang Haijun;Zhang Wei;Yu Liwei(Technical Center of Ben Gang Group Corporation.Benxi 117000,China;National and local joint engineering laboratory of advanced automotive steel development and application technology.Benxi 117000,China;Cold Rolling Mill of Ben Gang.Benxi 117000,China)

机构地区：[1]本钢集团有限公司技术中心,本溪117000 [2]先进汽车用钢开发与应用技术国家地方联合工程实验室,本溪117000 [3]本钢冷轧总厂,本溪117000

出　　处：《冶金信息导刊》2024年第5期13-16,共4页Metallurgical Information Review

摘　　要：为了研究较长时间回火对性能和组织的影响,利用马弗炉、SEM、EDS、拉伸试验机和冲击试验机,分析700 MPa高强钢热轧和回火状态的性能和组织变化。结果表明,回火后性能变化较大,与热轧工艺有较大关系;回火温度600℃和回火时间60 min时,铁素体长大明显、M/A组元大量分解,降低了强度提高了韧性;回火工艺为回火温度570℃和65 min时,铁素体的长大不明显,M/A组元的分解不完全,有利于保持较高的强度;粒状贝氏体和细小的M/A组元是700 MPa高强钢保持较高强度和韧性的基础,存在大尺寸TiN的情况下,回火后-20℃横向冲击功可达100 J左右。In order to study the effects of long-term tempering on properties and microstructure,the performance and microstructure changes of 700 MPa high-strength steel in hot rolling and tempering conditions were analyzed using muffle furnace,SEM,EDS,tensile testing machine,and impact testing machine.The results show that there is a significant change in performance after tempering,which is closely related to the hot rolling process.When tempering temperature is 600℃and tempering time is 60 min,the ferrite grows significantly,and the M/A constituent decomposes significantly,reducing strength and improving toughness;When the tempering temperature is 570℃and and tempering time is 65 min,the growth of ferrite is not significant,and the decomposition of M/A constituent is incomplete,which is beneficial for high strength;Granular bainite and fine M/A constituent are the basis for high strength and toughness in 700 MPa high-strength steel.In the presence of large-sized TiN,the transverse impact energy after tempering at-20℃can reach about 100 J.

关 键 词：700 MPa M/A组元 冲击功 回火 粒状贝氏体 TIN 

分 类 号：TG142.1[一般工业技术—材料科学与工程]