冶炼工艺对A286合金高温拉伸性能的影响  

Effect of Smelting Process on High Temperature Tensile Properties of A286 Alloy

作　　者：李大维 胡杰 陆恒昌 赵萍丽[4] 李瑛 董瀚 LI Dawei;HU Jie;LU Hengchang;ZHAO Pingli;LI Ying;DONG Han(State Key Laboratory of Advanced Special Steel,Shanghai University,Shanghai 200444,China;SAIC Motor Passenger Vehicle Co.,Ltd.,Shanghai 200041,China;Zhejiang Institute of Advanced Materials,Shanghai University,Jiashan Zhejiang 314113,China;Zhoushan 7412 Factory,Zhoushan Zhejiang 316041,China;Dongbei Special Steel Group,Co.,Ltd.,Dalian Liaoning 116105,China)

机构地区：[1]上海大学省部共建高品质特殊钢冶金与制备国家重点实验室,上海200444 [2]上汽集团股份有限公司乘用车分公司,上海200041 [3]上海大学(浙江)高端装备基础件材料研究院,浙江嘉善314113 [4]舟山市7412工厂,浙江舟山316041 [5]东北特殊钢集团股份有限公司,辽宁大连116105

出　　处：《上海金属》2023年第4期89-94,共6页Shanghai Metals

基　　金：省部共建高品质特殊钢冶金与制备国家重点实验室、上海市钢铁冶金新技术开发应用重点实验室自主课题(SKLASS2022-17);上海市科学技术委员会资助项目(19DZ2270200)。

摘　　要：为了研究冶炼工艺对A286合金高温拉伸性能的影响,分别采用真空感应熔炼炉+电渣重熔和电弧炉+VOD炉+LF炉+电渣重熔两种工艺冶炼了不同成分的A286合金。对合金进行了900℃保温2 h水冷的固溶处理和720℃保温16 h的时效处理,并在450、550、650、700、750、800℃进行了拉伸试验。结果表明:固溶和时效处理后采用两种工艺冶炼的A286合金的显微组织均为奥氏体,并有孪晶,晶粒度为9.5级;随着拉伸试验温度的提高,合金的屈服和抗拉强度均降低;由于孪晶和晶界析出相较多,电弧炉熔炼试样的高温强度略高于真空感应熔炼试样;由于杂质含量较高,电弧炉熔炼试样在650~700℃发生脆断,700℃塑性最低。In order to investigate the effect of smelting process on its high-temperature tensile properties,the A286 alloy having different compositions were smelted by process consisting of vacuum induction melting(VIM)furnace and electroslag remelting and process consisting of electric arc furnace(EAF),VOD furnace,LF furnace and electroslag remelting,respectively.The alloy was solution treated by heating at 900℃for 2 h then water cooling and aged at 720℃for 16 h.Subsequently,the alloy were subjected to tensile tests at 450,550,650,700,750,and 800℃.The results showed that(a)after solution treating and aging the A286 alloy smelted by two procedures exhibited austenite structure with twins and grains of 9.5 grade;(b)with the rise in tensile test temperature both yield strength and tensile strength of the alloy decreased;(c)the EAF specimen was slightly higher than the VIM specimen in high-temperature strength due to the more twins and precipitated phases at grain boundary;and(d)the higher impurity content resulted in occurrence of brittle fracture at temperatures ranging from 650 to 700℃and minimum plasticity at 700℃for the EAF specimen.

关 键 词：A286合金 冶炼工艺 高温拉伸性能 脆性断裂 

分 类 号：TG156.94[金属学及工艺—热处理] TG141[金属学及工艺—金属学]