The fracture surface appeared intergranular crack, due to the oxide formed during tensile test.
拉伸过程中形成的氧化物夹杂成为裂纹源，断口表现为沿晶断裂。
While under the same test conditions, samples without coating have undergone severe damages on both the surface and the fracture section.
而在同等条件下未涂层试样不论是表面还是断口处都已遭受了较为严重的破坏。
The studies were carried out of the test of fatigue crack growth rate and relative to the microscopic morphology of fracture surface in certain high-strength steels.
本文用宏观和微观方法测量了几种高强度钢的疲劳裂纹扩展速率，用金相和断口复型法观察了疲劳断口的微观形态以及与显微组织的关系。
The surface tiny crack generating by sample hardening were found in test, and some surface fracture caused by inclusion and gas pocket, and these appearance should be correctly analyzed and judged.
飞机发动机减速器支撑杆在加工过程中易产生微裂纹，通过显微组织检验、断口形貌观察、微区成分分析以及含氢量测定和模拟焊接试验等方法对其裂纹产生的原因进行了分析。
It is put forward that the analysis method of fracture surface of metallic tension test specimen is available.
提出的金属拉伸试样断口分析方法是可行的。
It is put forward that the analysis method of fracture surface of metallic tension test specimen is available.
提出的金属拉伸试样断口分析方法是可行的。
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