15MnV钢动态断裂韧性及韧－脆转变的分析  

DYNAMIC FRACTURE TOUGHNESS AND CHARACTERISTIC OF DUCTILE-BRITTLE TRANSITION IN 15MnV STEEL

作　　者：唐国翌[1] 苏毅[1] 蔡其巩[1] 陈卓华 刘雅娣[1] 

机构地区：[1]清华大学,太原重型机器厂,清华大学机械系

出　　处：《钢铁》1995年第6期43-47,57,共6页Iron and Steel

摘　　要：本文通过模拟大型挖掘机实际生产工况，研究了１５ＭｎＶ钢在不同加载速率下的动态断裂韧性（Ｋ＿（Ｉｄ）及其韧－脆转变特征，结合显微组织和第二相的特征分析了挖掘机起重臂脆性开裂的原因。结果表明：１５ＭｎＶ钢热轧板动态断裂韧性很差，在模拟挖掘机工作状态的动态加载条件下，其韧－脆转变温度可由原先静载下的－３０～－５０℃升至动载时的－１２℃。如果进一步提高加载速率，其韧－脆转变温度可升至常温。The dynamic fracture toughness K_(Id) and characteristic of the ductile-brittie transition of 15MnV steel in various loading rate which referred the heavy-duty excavator working condition were determined.The effect of microstructure and second phase particles on brittle fracture was investigated.It is shown that dynamic fracture toughness K_(Id) of the 15MnV steel plate as hot-rolled was very low. Its ductile-brittle tansition temperature (T_(DB))changs from-30℃～-50℃at static loading to-12℃ at dynamic loading. If loading rate still further increase,the ductile-brittle transition temperature of the steel can be increased to ambient temperature.

关 键 词：锰钒钢 动态断裂 低合金高强度钢 韧性 脆性 

分 类 号：TG142.33[一般工业技术—材料科学与工程]