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首页> 外文期刊>Journal of Materials Engineering and Performance >Influence of Tempering in Different Melting Routes on Toughness Behavior of AISI 4340 Steel
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Influence of Tempering in Different Melting Routes on Toughness Behavior of AISI 4340 Steel

机译：不同熔化途径对AISI 4340钢韧性行为的影响

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摘要

Martensitic microstructure of AISI 4340 steel can be heat treated to achieve the desired mechanical properties. However, mechanical properties degrade owing to the impurities and cleanliness during the steel production. In this work, AISI 4340 steel was produced through three different routes, such as vacuum degassing (VD), electro slag remelting (ESR), and vacuum arc remelting (VAR), followed by austenizing, hardening, and tempering. Further, mechanical characterization such as tensile, hardness, and toughness were carried out in a wide range of tempering temperatures (171-649 degrees C). A variation in mechanical properties was observed due to the evolution of precipitated carbide with the tempering temperature in all three routes. A thicker carbide layer along the martensitic lath boundary led to higher embrittlement in VD and VAR for tempering regime 171-427 degrees C. The absence or lesser embrittlement in ESR attributes to the homogeneously distributed fragmented carbides. Martensitic lath coarsening, ferritic phase formation along with the precipitated carbide distribution, significantly enhances the fracture toughness over the impact toughness at higher tempering temperature (> 316 degrees C). The difference in the mechanical properties in all the three routes is found to be sensitive toward the chemical composition causing a marked difference in the carbide precipitation and its distribution along the martensitic lath boundaries.
机译：AISI 4340钢的马氏体微观结构可进行热处理，以达到所需的机械性能。然而，由于钢铁生产过程中的杂质和清洁度，机械性能会降低。在这项工作中，AISI 4340钢通过三种不同的途径生产，如真空脱气（VD）、电渣重熔（ESR）和真空电弧重熔（VAR），然后进行奥氏体化、硬化和回火。此外，在大范围回火温度（171-649摄氏度）下进行了拉伸、硬度和韧性等力学表征。在所有三种途径中，由于析出碳化物随回火温度的变化，观察到机械性能的变化。沿马氏体板条边界的较厚碳化物层导致在171-427℃回火状态下，VD和VAR中的脆性较高。ESR中没有脆性或脆性较小，归因于均匀分布的碎片碳化物。马氏体板条粗化、铁素体相形成以及析出的碳化物分布，显著提高了较高回火温度（>316℃）下的断裂韧性，而不是冲击韧性。发现所有三种途径的机械性能差异对化学成分敏感，导致碳化物沉淀及其沿马氏体板条边界分布的显著差异。

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