Abstract

The main factors governing a mixed effect of nonmetallic inclusions as internal sources of microalloying on local strengthening of steels upon laser treatment are systematized and analyzed. The processes, which govern the nature of the microcomposite zone formation, heterogenization regarding the structure of steel matrix and inclusion–matrix phase boundaries, as well as the decrease in the sizes of inclusions and their content in the surface layer, are discussed. The effect of preliminary laser treatment on the mechanism and parameters of crack formation near inclusions upon subsequent deformation at 25–900 and 1000–1250°C is shown. The effect of the saturation zones of steel matrix on the form of crack propagation from inclusions is determined.

中文翻译：

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非金属夹杂物对激光处理钢强化的影响分析

摘要

系统分析了非金属夹杂物作为微合金化的内部来源对钢的激光处理局部强化的混合影响的主要因素。讨论了控制微复合区形成的性质、钢基体结构和夹杂物-基体相界的非均质化以及夹杂物尺寸及其在表面层中含量减少的过程。显示了初步激光处理对夹杂物附近裂纹形成机制和参数对随后在 25-900 和 1000-1250°C 下变形的影响。确定了钢基体饱和区对夹杂物裂纹扩展形式的影响。