锻后控冷对38MnVS非调质钢晶内铁素体形成及韧性的影响  

Effect of controlled cooling after forging on formation of intragranular ferrite and toughness for a 38MnVS steel

作　　者：赵秀明[1] 毛向阳[1] 蔡璐[1] 张进 余永兵 惠卫军[3] 

机构地区：[1]南京工程学院材料工程学院,江苏南京211167 [2]南京汽车锻造有限公司,江苏南京210000 [3]钢铁研究总院,先进钢铁材料技术国家工程研究中心,北京100081

出　　处：《材料热处理学报》2013年第11期114-118,共5页Transactions of Materials and Heat Treatment

基　　金：南京市科技计划项目(201103041);南京工程学院基金项目(KXJ08135;YKJ201008);江苏省高校科研成果产业化推进项目(JHB2011-25)

摘　　要：研究了锻后控冷工艺对中碳含钒微合金38MnVS非调质钢锻件晶内铁素体形成的影响，对锻后不同控冷工艺条件下微合金非调质钢锻件的显微组织、拉伸性能、冲击韧性和冲击断口进行了试验分析。结果表明，在正常的锻造加热温度（1180～1200℃）和终锻温度（1000～1050℃）条件下，采用锻后快冷并在550℃左右保温缓冷的工艺条件，可抑制先共析铁素体沿原奥氏体晶界的析出，获得较多细小条、块状的晶内铁素体，微合金钢锻件的冲击韧性提高了近4倍，同时仍具有较高的强度，且塑性略有提高。Effect of controlled cooling after forging on formation of intragranular ferrite of a medium carbon 38MnVS steel was investigated by analyzing its microstructure, tensile properties, impact toughness and fracture. The results show that when the forging heating temperature and the final forging temperature are 1180 - 1200 ℃ and 1000 - 1050 ℃ ,respectively, followed by fast cooling to 550 ℃ and then cooling in furnace, the proeutectoid ferrite precipitation along prior-austenite grain boundries is restrained, and more fine and blocky intragrnular ferrite is observed in the steel. This increasing of intragranular ferrite is contributed to the 4 times increase of impact toughness, and the increasing strength and with slight raising of plasticity.

关 键 词：38MnVS微合金钢 晶内铁素体 冲击韧性 

分 类 号：TG142.33[一般工业技术—材料科学与工程]