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采用宽带激光相变硬化工艺对T10钢表面进行了改性处理 ,并对改性后的组织与性能进行了研究 ,结果表明 ,硬化区组织为针状马氏体 +少量残余奥氏体。热影响区组织为少量针状马氏体 +珠光体 +网状渗碳体。基材组织为珠光体+网状渗碳体。淬硬层表面的洛氏硬度最高值为HRC6 3 5 ,淬硬层内的显微硬度分布均匀 ,最高显微硬度值约为HV94 0 ,从硬化区→热影响区→基材显微硬度呈梯度变化。激光相变硬化后淬硬层表面的残余应力分析表明 ,淬硬层表面存在压应力 ,压应力的最大值为 - 4 2 9MPa。
The surface of T10 steel was modified by broadband laser transformation hardening process. The microstructure and properties of the T10 steel were studied. The results show that the microstructure of the T10 steel is acicular martensite + a small amount of retained austenite. Heat affected zone organization for a small amount of acicular martensite + pearlite + reticular cementite. Substrate structure for the pearlite + reticular cementite. The highest Rockwell hardness on the surface of hardened layer is HRC635, and the distribution of microhardness in the hardened layer is uniform. The highest microhardness value is about HV94 0. From the hardening zone to the heat-affected zone, the microhardness of the substrate is Gradient changes. Residual stress analysis of hardened layer after laser phase transformation hardening shows that there is compressive stress on the surface of hardened layer, and the maximum value of compressive stress is -42 9MPa.