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Effect of a Tempering Treatment on the Microstructural Evolution and Mechanical Properties of an M2 HSS/Ta Alloy Fabricated by Laser Metal Direct Forming
Steel Research International ( IF 1.9 ) Pub Date : 2021-04-21 , DOI: 10.1002/srin.202100027 Jiale Wang 1 , Changjun Chen 1 , Min Zhang 1
Steel Research International ( IF 1.9 ) Pub Date : 2021-04-21 , DOI: 10.1002/srin.202100027 Jiale Wang 1 , Changjun Chen 1 , Min Zhang 1
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In a previous work, M2 high-speed steel consisting of Ta on #45 steel was prepared by a laser metal direct forming process. After the appropriate proportion of Ta powder is added, obvious grain refinement occurs, and the amount of retained austenite decreases. Furthermore, the microhardness, impact toughness, and wear resistance increase. On the basis of this work, the microstructure and mechanical properties of the samples are further studied after tempering at different temperatures. The phase, microstructure, hardness, and wear resistance of the two kinds of steels are characterized by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and hardness and wear tests. The results show that compared with the deposition state, the microstructure of the samples after heat treatment shows grain refinement and carbide aggregation. In addition, the hardness and impact toughness of the samples increase to different degrees after tempering at an appropriate temperature. However, after tempering, the mesh structure of the grain boundaries is destroyed, and the anchoring effect of the carbides weakens; thus, the wear rate of the samples increases to a certain extent.
中文翻译：
回火处理对激光金属直接成形制造的 M2 HSS/Ta 合金的显微组织演变和机械性能的影响
在之前的一项工作中，#45 钢上含有 Ta 的 M2 高速钢是通过激光金属直接成形工艺制备的。添加适当比例的Ta粉后，晶粒发生明显细化，残余奥氏体量减少。此外，显微硬度、冲击韧性和耐磨性增加。在此工作的基础上，进一步研究了样品在不同温度回火后的显微组织和力学性能。通过X射线衍射、扫描电镜、能量色散X射线光谱、硬度和磨损试验对两种钢的物相、显微组织、硬度和耐磨性进行表征。结果表明，与沉积状态相比，热处理后试样的显微组织表现为晶粒细化和碳化物聚集。此外，试样在适当温度回火后硬度和冲击韧性均有不同程度的提高。但回火后，晶界的网状结构被破坏，碳化物的锚固作用减弱；因此，样品的磨损率在一定程度上增加。
更新日期：2021-04-21
中文翻译：
回火处理对激光金属直接成形制造的 M2 HSS/Ta 合金的显微组织演变和机械性能的影响
在之前的一项工作中，#45 钢上含有 Ta 的 M2 高速钢是通过激光金属直接成形工艺制备的。添加适当比例的Ta粉后，晶粒发生明显细化，残余奥氏体量减少。此外，显微硬度、冲击韧性和耐磨性增加。在此工作的基础上，进一步研究了样品在不同温度回火后的显微组织和力学性能。通过X射线衍射、扫描电镜、能量色散X射线光谱、硬度和磨损试验对两种钢的物相、显微组织、硬度和耐磨性进行表征。结果表明，与沉积状态相比，热处理后试样的显微组织表现为晶粒细化和碳化物聚集。此外，试样在适当温度回火后硬度和冲击韧性均有不同程度的提高。但回火后，晶界的网状结构被破坏，碳化物的锚固作用减弱；因此，样品的磨损率在一定程度上增加。
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