论文部分内容阅读
叙述了采用不同方法生产的几种高速钢的抗弯强度测试结果，讨论了未溶碳化物的尺寸分布、以及热变形和奥氏体化温度对未溶碳化物尺寸和实验钢抗弯强度的影响。用扫描电镜分析断口确定了断裂引发缺陷，并测量了尺寸。依据抗弯强度的断裂力学模型讨论了试验结果，指出对于铸锭法生产的材料，断裂是由显微裂纹引起的，而显微裂纹又是亚临界裂纹在纵向带状碳化物堆积区扩展形成的；对于粉末法生产的材料，断裂由大颗粒碳化物或碳化物堆积引起。
The test results of flexural strength of several high speed steels produced by different methods are described. The size distribution of undissolved carbides, the effect of heat distortion and austenitizing temperature on the undissolved carbide size and the flexural strength of experimental steels influences. The fracture was analyzed by scanning electron microscopy to determine the fracture initiation defect and to measure the dimensions. According to the fracture mechanics model of flexural strength, the experimental results are discussed. It is pointed out that for the materials produced by the ingot ingotting method, the fracture is caused by microcracks, which are also subcritical cracks that extend in the longitudinal band-shaped carbide deposit ; For the powder produced material, fracture caused by the accumulation of large particles of carbides or carbides.