等温温度对铸态先进高强钢显微组织及冲击韧性的影响  

Effect of isothermal temperature on microstructure and impact toughness of as-cast advanced high strength steel

作　　者：李钰 张天舒 李文华 李宛遥 赵雅琼 陈雪驰 吴战芳 LI Yu;ZHANG Tianshu;LI Wenhua;LI Wanyao;ZHAO Yaqiong;CHEN Xuechi;WU Zhanfang(CISRI HIPEX Technology Co.,Ltd.,Beijing 100081,China;Jiangsu CISRI HIPEX Technology Co.,Ltd.,Zhenjiang 212000,Jiangsu,China)

机构地区：[1]钢研昊普科技有限公司,北京100081 [2]江苏钢研昊普科技有限公司,江苏镇江212000

出　　处：《江西冶金》2022年第1期12-16,共5页Jiangxi Metallurgy

摘　　要：研究了720、800、860℃等温热处理对试验钢显微组织及冲击韧性的影响。结果表明:在720℃等温热处理时,试样显微组织是贝氏体+珠光体+铁素体,为原始铸态组织;800℃等温热处理时,显微组织以珠光体+铁素体为主,同时还存在少量的晶界先共析铁素体;860℃等温热处理时,基体组织为多边形铁素体+珠光体。等温温度对试验钢的冲击韧性有较大的影响,经720、800、860℃等温热处理试样的冲击功分别为10、14、25 J。The effects of isothermal treatment at 720,800,860℃on the microstructure and impact toughness of the test steel were studied.The results show that microstructure of the sample at 720℃is bainite+pearlite+ferrite,which is the original as-cast microstructure;At 800℃,the microstructure is mainly pearlite+ferrite,together with a small amount ofγgrain boundary proeutectoid ferrite;At 860℃,the matrix microstructure is polygonal ferrite+pearlite.The impact energy of 860℃isothermal sample is 60%higher than that of 720℃and 44%higher than that of 800℃.

关 键 词：热处理 等温温度 AHSS 显微组织 断裂韧性 

分 类 号：TG142.3[一般工业技术—材料科学与工程]