高强度螺栓断裂分析  

FRACTURE ANALYSIS ON HIGH STRENGTH BOLT

作　　者：曾振鹏[1] 

机构地区：[1]上海交通大学高温材料及高温测试教育部重点实验室,上海200030

出　　处：《理化检验（物理分册）》2002年第12期559-561,共3页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：采用断口分析、金相检验和硬度测定等方法 ,对高强度螺栓断裂原因进行了分析。断口分析结果表明 ,断口平坦 ,呈放射状花样 ,微观形态主要为准解理花样 ,表明螺栓的断裂是脆性断裂 ;同时发现 ,在断口附近还存在横向内裂纹 ,内裂纹的断口形态与断裂断口一样。金相分析表明 ,材料棒中存在严重的中心碳偏析 ,而中心碳偏析是引起断裂的主要原因。The fracture reasons of high strength bolt are analyzed using fractography, metallographic analysis and hardness testing in this paper. It is shown that the fracture surface is flat and of radiating pattern with the microstructure being quasi-cleavage fracture, which indicates the fracture of the bolt is brittle. It is also found that there are transverse direction cracks inside near the fracture with same pattern as the fracture surface. Metallographic analysis shows heavily central carbon segregation existing in the raw material. Therefore, such brittle fracture is mainly due to the existing of central carbon segregation in the raw material.

关 键 词：高强度螺栓 断裂分析 准解理 横向内裂纹 中心碳偏析 断口形貌 金相分析 

分 类 号：TH131.3[机械工程—机械制造及自动化] TG11[金属学及工艺—物理冶金]