摘要
针对某寒冷地区矿山用大型焊接结构件的开裂事故,在模拟实际工况下,研究了该钢的动态断裂特性,分析了产生脆性开裂的原因。结果表明:该批15MnV钢的韧-脆转变温度对加载速率敏感。在挖掘机挑大块岩石的工况条件下所产生的功载冲击可使该钢的韧-脆转变温度升至-12℃,该值与斗杆和起重臂等结构件发生脆性开裂的环境温度相近。此外。钢的冶炼质量和处理状态对钢的断裂韧性和韧-脆转变特征有很大影响。
The characteristics of dynamic fracture of the steel used in the constructional elements of heavy-duty excavators which worked in cold mining environment were investigated by simulating the real operation state.The reasons of brittle fracture were analyzed. It was shown that the ductile-brittle transition temperature in the 15MnV steel was sensitive to loading rate. As digger of the excavator dashed on the recks, the ductile-brittle transition temperature of the steel could be increased to -12℃.This temperature is close to the failure environmental temperature of the steel. It was found that the metallugical quality and treatment state of the steel had an obvious influnce on its fracture toughness and ductilbrittle transition temperature.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
1992年第3期187-192,共6页
Transactions of The China Welding Institution
基金
国家重大技术装备科技攻关项目
关键词
挖掘机
动态断裂
韧-脆转变
焊件
excavator
dynamic fracture
ductil-brittle transition
