转炉连接螺栓断裂分析  

FRACTURE ANALYSIS OF CONNECTING BOLT IN A CONVERTER

作　　者：陈兴元[1] 刘锦燕[1] 蒋仁贵[1] 

机构地区：[1]攀枝花钢铁研究院,攀枝花617000

出　　处：《理化检验（物理分册）》2000年第11期508-512,共5页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：分析了炼钢转炉托圈连接螺栓早期断裂的原因。结果表明 ,开裂起源于加工时变截面过渡圆角的尖刀痕 ,经短程疲劳扩展后发生脆断。螺栓脆断是由于严重的冶金缺陷及组织不良 ,导致材料性能恶化。重新热处理后获得了良好的综合性能。An investigation was made into one of the self adjustable bolts connecting the converter trunnion ring in a steel mill which broke after being in service for 13 months. The results showed that the fracture initiated in a heavy tool mark at a change in section, and propagated for a short distance as fatigue crack, then the remainder of the section fractured in a brittle manner. Brittle fracture of the bolt occurred because of the combined effect of a massive metallurgical defect plus a coarse mixed microstructure (bainite and martensite). Both higher strength and better impact toughness are obtained after re heat treatment of the bolts.

关 键 词：螺栓 疲劳断裂 过热 冶金缺陷 

分 类 号：TF748.2[冶金工程—钢铁冶金]