摘要
某式手枪枪管在组装前的高压试验中不断出现断裂。断口呈脆性特征，靠近内表面裂源部分（脆性断裂区）呈沿晶断裂形态，并发现有腐蚀产物，中间过渡区（裂纹扩展区）呈准解理＋韧窝＋沿晶形态，接近外表面部分（瞬断区）呈准解理＋韧窝形态。分析结果显示断裂主要是应力腐蚀裂纹导致。枪管变形后的校正造成内表面有残余应力，为应力腐蚀提供了应力条件；除锈使用了酸洗工艺，为应力腐蚀提供了腐蚀条件。采取相应措施后，彻底避免了同样失效的发生。
Fracture of some pistol chamber frequently occur during high pressure tests before assembly. The rupturing surface shows a brittle characteristic. The inner surface cracks have revealed on the area close to the breakpoint （the brittle fracture zone） , and corrosion products are found. A complex shape of quasi-cleavage, dimple and intergranular fracturing is reveled in the middle transitional area （crack spreading zone）. For the area close to the outer surface （the momentary rupturing zone） , a form of quasi -cleavage and dimple fracturing is found. The analysis shows that the fracture is mainly caused by the stress-induced corrosion cracking. The residual stress inside the chamber, which is originated from the emendation process of the steel chamber, provides the stress for the stress-induced corrosion cracking. On the other hand, the acid solution used to remove the rust of the chamber, provides the corrosion media for the stress-induced corrosion. The fracture has been completely avoided after the adoption of certain processes according to the conclusion obtained.
出处
《装甲兵工程学院学报》
2007年第5期45-48,共4页
Journal of Academy of Armored Force Engineering
基金
装备再制造国防科技重点实验室项目(9140C8503030705)
关键词
手枪枪管
失效分析
断裂
应力腐蚀
pistol chamber
failure analysis
fracture, stress-induced corrosion
