汽车悬架弹簧用55SiCrA线材的热模拟显微组织研究  

Study on thermal simulation microstructures of 55SiCrA steel for automobile suspension spring

作　　者：赵良群 童为硕 蒋跃东 杨伟 刘继雄 ZHAO Liangqun;TONG Weishuo;JIANG Yuedong;YANG Wei;Liu Jixiong(Jiangsu JITRI Metallurgical Technology Research Institute Co.,Ltd,Zhangjiagang 215600,China)

机构地区：[1]江苏冶金技术研究院,张家港215600

出　　处：《中国体视学与图像分析》2022年第1期18-25,共8页Chinese Journal of Stereology and Image Analysis

摘　　要：采用THERMECMASTOR-Z热加工模拟试验机,对汽车悬架弹簧用55SiCrA线材,在800℃、900℃和1000℃的冷却起始温度和15℃/s、10℃/s、5℃/s和1℃/s的冷却速度试验条件下得到的显微组织进行了分析和研究。结果表明:在800~1000℃不同冷却起始温度下,冷却起始温度越高,冷却速度越快,钢中贝氏体和马氏体的含量也越多。在试样以恒定的速率加热到950℃后,采用40℃/s、20℃/s、10℃/s、5℃/s、2℃/s、1℃/s、0.5℃/s和0.2℃/s不同冷却速度,当冷却速度较慢时,钢中组织为珠光体+铁素体;当冷却速度增加时,钢中出现贝氏体、马氏体,且其含量与冷速呈正比。The microstructures of the samples cut from 55 SiCrA wire rod for automobile suspension spring under the test conditions of initial cooling temperature of 800℃,900℃and 1000℃with cooling rates 15℃/s,10℃/s,5℃/s and 1℃/s were analyzed and studied by Thermecmaster-Z thermal mechanical simulator.The results show that,under different initial cooling temperatures of 800~1000℃,the higher the initial cooling temperature is,the faster the cooling speed is,and the greater the content of bainite and martensite in steel.After the sample is heated to 950℃at a constant rate,different cooling rates of 40℃/s,20℃/s,10℃/s,5℃/s,2℃/s,1℃/s,0.5℃/s and 0.2℃/s are adopted.When the cooling rate is slow,the microstructures in the steel is pearlite+ferrite.When the cooling rate increases,bainite and martensite appear in the steel,and their content is directly proportional to the cooling rate.

关 键 词：汽车悬架弹簧钢 55SiCrA 热模拟 冷却速度 显微组织 

分 类 号：TG142.1[一般工业技术—材料科学与工程] U463.33[金属学及工艺—金属材料]