矿用耐磨钢球冲击疲劳强度偏低原因分析
发布时间：2018-09-04 15:27
【摘要】：通过宏观形貌观察、扫描电镜分析、能谱分析和显微组织分析等手段对落球疲劳试验时耐磨钢球冲击疲劳强度偏低的原因进行了研究。结果表明:断口平直较规则,无明显塑性变形;裂纹源处呈现"冰糖块"形貌,且部分晶粒尺寸超过100μm,为典型的沿晶界脆性断裂;断口附近存在少量的屈氏体组织,且沿着原奥氏体晶界分布;钢球近表面到断口处的晶粒尺寸明显不均匀,而且断口附近的晶粒较粗大。结合钢球生产工艺分析可知,钢球冲击疲劳强度偏低的主要原因是淬火组织粗大,另一重要原因是回火工序没有有效降低淬火内应力。
[Abstract]:The causes of low impact fatigue strength of wear-resistant steel balls in ball drop fatigue test were studied by means of macroscopic observation, scanning electron microscope analysis, energy dispersive analysis and microstructure analysis. The results show that the fracture surface is more regular and has no obvious plastic deformation, the crack source has a "rock sugar block" shape, and some grain sizes exceed 100 渭 m, which are typical brittle fracture along the grain boundary, and there is a small amount of tricustian structure near the fracture surface. The grain size of the steel ball from the surface to the fracture surface is obviously uneven, and the grain near the fracture surface is larger than that near the fracture surface. According to the analysis of steel ball production process, the main reason for the low impact fatigue strength of steel ball is the coarse quenching structure, and the other important reason is that the tempering process does not effectively reduce the internal stress of quenching.
【作者单位】： 东北大学轧制技术及连轧自动化国家重点实验室;江苏沙钢集团淮钢特钢股份有限公司;江苏天淮钢管有限公司;
【分类号】：TD453;TG142.72
本文编号：2222583
[Abstract]:The causes of low impact fatigue strength of wear-resistant steel balls in ball drop fatigue test were studied by means of macroscopic observation, scanning electron microscope analysis, energy dispersive analysis and microstructure analysis. The results show that the fracture surface is more regular and has no obvious plastic deformation, the crack source has a "rock sugar block" shape, and some grain sizes exceed 100 渭 m, which are typical brittle fracture along the grain boundary, and there is a small amount of tricustian structure near the fracture surface. The grain size of the steel ball from the surface to the fracture surface is obviously uneven, and the grain near the fracture surface is larger than that near the fracture surface. According to the analysis of steel ball production process, the main reason for the low impact fatigue strength of steel ball is the coarse quenching structure, and the other important reason is that the tempering process does not effectively reduce the internal stress of quenching.
【作者单位】： 东北大学轧制技术及连轧自动化国家重点实验室;江苏沙钢集团淮钢特钢股份有限公司;江苏天淮钢管有限公司;
【分类号】：TD453;TG142.72
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