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。 Some type of pistol barrel in the high pressure test before the assembly continued to appear broken. The fractures are brittle, with the intergranular fracture near the inner surface of the source (brittle fracture zone), and the corrosion products are found. The intermediate transition zone (crack propagation zone) is quasi-cleavable + dimple + intergranular and close to the outer Surface part (instantaneous area) was quasi cleavage + dimple morphology. The analysis shows that the fracture is mainly caused by stress corrosion cracking. Correction after barrel deformation causes residual stress on the inner surface, providing stress conditions for stress corrosion; rust removal uses a pickling process, providing corrosion conditions for stress corrosion. After taking corresponding measures, the same failure can be completely avoided.