In Situ X-Ray Diffraction Analysis of Microstructure Evolution during Deep Cryogenic Treatment and Tempering of Tool Steels,Steel Research International

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In Situ X-Ray Diffraction Analysis of Microstructure Evolution during Deep Cryogenic Treatment and Tempering of Tool Steels
Steel Research International ( IF 1.9 ) Pub Date : 2021-05-07 , DOI: 10.1002/srin.202100076
Chengsong Cui ₁ , Juan Dong ₁ , Jérémy Epp ₁ , Alwin Schulz ₁ , Matthias Steinbacher ₁ , Serdal Acar ₂ , Sebastian Herbst ₂ , Hans Jürgen Maier ₂

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Deep cryogenic treatment of tool steels, incorporated in conventional hardening and tempering, has been a topic of intensive research in recent years. Yet, the governing microstructural mechanisms involved in the deep cryogenic treatment of high-alloyed tool steels are still controversial. Thus, an in situ X-ray diffraction study is conducted on three tool steels X38CrMoV5-3, X153CrMoV12, and ~X190CrVMo20-4 to shed light on microstructural evolution during cryogenic treatment and subsequent tempering. For these high-alloyed tool steels, the transformation of retained austenite into martensite is detected during the cooling phase of the cryogenic treatment. A change in tetragonality of martensite occurs mainly in the heating phase of the subsequent tempering process, which indicates the diffusion of carbon and carbide precipitation from the martensite. The microstructure evolution of the tool steels after hardening, cryogenic treatment, and tempering is further examined by scanning electron microscopy.

中文翻译：

工具钢深冷处理和回火过程中显微组织演变的原位 X 射线衍射分析

工具钢的深冷处理，结合传统的淬火和回火，近年来一直是深入研究的课题。然而，高合金工具钢深冷处理所涉及的显微组织机制仍存在争议。因此，对三种工具钢 X38CrMoV5-3、X153CrMoV12 和 ~X190CrVMo20-4 进行了原位 X 射线衍射研究，以揭示低温处理和后续回火过程中的显微组织演变。对于这些高合金工具钢，在深冷处理的冷却阶段检测到残余奥氏体向马氏体的转变。马氏体四方性的变化主要发生在后续回火过程的加热阶段，这表明碳和碳化物从马氏体中析出的扩散。通过扫描电子显微镜进一步检查工具钢在淬火、低温处理和回火后的微观结构演变。

更新日期：2021-05-07

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