摘要
分析一种车轮铸钢材料在 75 0℃和 2 0℃之间不同温度循环范围的热疲劳断口形貌特征。在循环上限温度超过 0 .5 Tm 时 ,热疲劳损伤是蠕变损伤占主导地位 ,沿晶脆性断裂为主要机制。在循环上限温度低于0 .5 Tm 时 ,热疲劳断裂机制为以解理为主要特征的穿晶断裂。随着循环上限温度进一步下降 ,热疲劳损伤程度较轻 。
The thermal fatigue fracture characteristics of a cast steel for wheel in different temperature cycles from 750 ℃ to 20 ℃ have been studied by using SEM. Results show that serious thermal fatigue damage is the main reason of creep cracking when the upper cycling temperature is higher than 0.5 T m. The fracture mechanism is changed into transcrystalline fracture along cleavage planes as upper cycling temperature is below 0.5 T m. At a lower cycling temperature, the damage is caused mainly by oxidation etching pits.
出处
《钢铁》
CAS
CSCD
北大核心
2002年第12期50-52,共3页
Iron and Steel
关键词
车轮铸钢
热疲劳损伤
变疲劳断裂机理
腐蚀坑
铁路车辆
wheel cast steel, thermal fatigue damage, creep-fatigue fracture mechanism, etching pit
