新型C级大规格矿用圆环链用钢的连续冷却转变及淬透性研究  

Study on Continuous Cooling Transformation and Hardenability of New C Grade Link-chain Steel for Mining

作　　者：陈静[1] 武兴旺 王宝奇[1] 姜延飞[1] 封姜伟[1] 

机构地区：[1]河北工业大学材料科学与工程学院,天津300130 [2]中煤张家口煤矿机械有限责任公司圆环链分厂,河北张家口075025

出　　处：《热加工工艺》2008年第2期28-30,共3页Hot Working Technology

基　　金：天津市应用基础研究计划项目(07JCYBJC03400)

摘　　要：用膨胀法结合金相观察测定了新型C级大规格矿用圆环链用钢的连续冷却转变动力学曲线,并采用末端淬火法测定了该钢的淬透性曲线。结果表明,该钢获得全部马氏体的临界冷却速度为20℃/s,在20～5℃/s内获得马氏体和贝氏体混合组织,2.0～0.05℃/s获得铁素体和粒状贝氏体的混合组织。在很宽的冷却速度范围不出现珠光体。贝氏体形态与冷却速度有关。通过CCT曲线和淬透性曲线分析预测心部得到马氏体组织的圆钢棒最大直径为35mm。The CCT curve of new C grade link-chain steel was measured by means of dilatometry,metallographical structure analysis as well as hardness test. Meanwhile, the curve of hardenability was determined by end quenching. The results show that the critical cooling rate to gain all martensite is 20 ℃/s. When the cooling rate range is from 20 ℃/s to 5 ℃/s, the martensite and bainite structure is obtained. The mixed microstructure of ferrite and granular bainite can be obtained from 2℃/s to 0.05℃/s. Within a fairly wide cooling-rate range, no pearlite appears. The morphology ofbainite is related to the cooling rate. The maximum quenching diameter of the steel which has all martensite in its center is 35mm through the analyzing curve of CCT and hardenability.

关 键 词：矿用圆环链 CCT曲线 微合金化 淬透性 

分 类 号：TG111.5[金属学及工艺—物理冶金]