The lamellar cracking was found at the specimen of HSLA Nb-V steel plate after tensile strength testing, then the fracture surface of the specimen was studied by SEM and EDAX.
针对高强度低合金铌钒钢板在拉伸试验后出现分层开裂的现象，采用SEM、EDAX进行微观分析，发现试样内部有大量夹杂物存在，这些夹杂物主要含有钙、氧、硫、锰等元素。
The microstructure, surface fracture morphology, hardness and tensile strength of the failed 45 steel connecting bolt were analyzed and tested.
对45钢连接螺栓断裂件的显微组织、断口形貌、硬度和抗拉强度进行了观察分析和测试。
The crack nucleation energy and the propagation energy were measured under impact and tensile testing. The fracture surface was examined by SEM.
测定了析出相的类型和组成，测试和计算了冲击、拉伸状态下裂纹的形核能与扩展能，并通过SEM研究了断面形貌。
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