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应用宽带扫描技术对GCrl5轴承钢进行激光强化处理实验,实测激光相变硬化区的硬度和深度。采用有限元软件对激光强化过程中的温度场进行数值模拟,数值模拟结果与实验结果符合较好。激光淬硬层显微硬度分布主要与激光加热时温度场分布有关,奥氏体化过程中渗碳体的溶解和奥氏体中碳的浓度决定了最终微观结构和表面硬度。表面温度高、奥氏体化时间相对较长及冷却速率快导致了表面的高硬度。表面最高温度接近熔化温度时,仍含有一定数量的未溶渗碳体。
The application of broadband scanning technology GCrl5 bearing steel laser strengthening experiments, the measured laser phase hardening zone hardness and depth. The finite element software was used to simulate the temperature field in the laser strengthening process. The numerical simulation was in good agreement with the experimental results. The laser microhardness distribution is mainly related to the temperature field distribution during laser heating. The dissolution of cementite and the concentration of carbon in the austenite during the austempering process determine the final microstructure and surface hardness. High surface temperatures, relatively long austenitizing times and fast cooling lead to high surface hardness. Surface maximum temperature near the melting temperature, it still contains a certain amount of undissolved cementite.