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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Heat Treatment on Microstructure and Mechanical Properties of Laser Additively Manufactured AISI H13 Tool Steel
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Effect of Heat Treatment on Microstructure and Mechanical Properties of Laser Additively Manufactured AISI H13 Tool Steel

机译：热处理对激光加热组织和力学性能的影响，AISI H13工具钢

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摘要

The effect of heat treatment on microstructure and mechanical properties (microhardness, wear resistance and impact toughness) of laser additively manufactured AISI H13 tool steel was systemically investigated. To understand the variation of microstructure and mechanical properties under different heat treatments, the as-deposited samples were treated at 350, 450, 550, 600 and 650 degrees C/2 h, respectively. Microstructure and phase transformation were investigated through optical microscopy, scanning electron microscope and transmission electron microscope. The mechanical properties were characterized by nanoindentation tests, Charpy tests and high-temperature wear tests. The microstructure of as-deposited samples consisted of martensite, ultrafine carbides and retained austenite. After the tempering treatment, the martensite was converted into tempered martensite and some fine alloy carbides which precipitated in the matrix. When treated at 550 degrees C, the greatest hardness and nanohardness were 600 HV0.3 and 6119.4 MPa due to many needle-like carbides precipitation. The value of hardness increased firstly and then decreased when increasing the temperature. When tempered temperatures exceeded 550 degrees C, the carbides became coarse, and martensitic matrix recrystallized at the temperature of 650 degrees C. The least impact energy was 6.0 J at a temperature of 550 degrees C. Samples tempered at 550 degrees C had larger wear volume loss than that of others. Wear resistances of all samples under atmospheric condition at 400 degrees C showed an oxidation mechanism.
机译：系统地研究了热处理对激光辅助制造的AISI H13工具钢组织和力学性能（显微硬度、耐磨性和冲击韧性）的影响。为了了解不同热处理下微观结构和机械性能的变化，沉积样品分别在350、450、550、600和650℃/2h下进行处理。通过光学显微镜、扫描电子显微镜和透射电子显微镜对其微观结构和相变进行了研究。通过纳米压痕试验、夏比试验和高温磨损试验对其力学性能进行了表征。沉积态试样的显微组织由马氏体、超细碳化物和残余奥氏体组成。回火处理后，马氏体转变为回火马氏体和一些细小的合金碳化物，这些碳化物在基体中析出。在550℃下处理时，最大硬度和纳米硬度为600 HV0。3和6119.4 MPa，这是由于许多针状碳化物析出。随着温度的升高，硬度值先升高后降低。当回火温度超过550°C时，碳化物变得粗糙，马氏体基体在650°C的温度下重新结晶。在550°C的温度下，最小冲击能量为6.0 J。在550°C的温度下回火的试样的磨损体积损失大于其他试样。在400℃的大气条件下，所有样品的耐磨性均表现出氧化机制。

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