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在45钢表面进行了碳化钨(WC)激光合金化实验,利用金相显微镜、维氏硬度计等设备检测了合金化层的组织和性能。实验表明:激光合金化层组织致密,晶粒细化,与基体呈冶金结合。其中,合金化区为含碳量过饱和的奥氏体树枝晶组织,热影响区为板条状淬火马氏体组织。合金化区平均硬度700 HV0.2,相变硬化区平均硬度550 HV0.2,硬度呈梯度过渡。通过与氮化试样的比较,表明激光合金化试样的强化层深度、平均硬度均高于氮化试样。45钢零件经激光合金强化后,使用寿命大大提高。
Tungsten carbide (WC) laser alloying experiments were carried out on the surface of 45 steel. The microstructure and properties of alloying layers were examined by metallographic microscope and Vickers hardness tester. Experiments show that: the laser alloying layer dense, grain refinement, metallurgical bonding with the substrate. Among them, the alloying zone is saturated austenite dendritic carbon content, heat affected zone lath martensitic lath-like structure. The average hardness of the alloying zone is 700 HV0.2, and the average hardness of the phase transformation hardening zone is 550 HV0.2. The hardness shows a gradient transition. By comparison with the nitrided sample, it shows that the depth of the strengthened layer and the average hardness of the laser alloying sample are higher than that of the nitrided sample. 45 steel parts strengthened by the laser alloy, the service life greatly increased.