期刊
STEEL RESEARCH INTERNATIONAL
卷 92, 期 12, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/srin.202100076
关键词
deep cryogenic treatment; microstructure; phase transformation; tool steels; X-ray diffraction
资金
- IGF project of the FOSTA-Forschungsvereinigung Stahlanwendung e.V. [19289 N]
- Arbeitsgemeinschaft industrieller Forschungsvereinigungen Otto-von-Guericke e.V. (AiF) within the Programme of Industrial Collective Research (IGF) - Federal Ministry for Economic Affairs and Energy
- Projekt DEAL
Deep cryogenic treatment of high-alloyed tool steels, followed by tempering, involves the transformation of retained austenite into martensite and the diffusion of carbon with carbide precipitation. This microstructural evolution is further examined through scanning electron microscopy.
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 similar to 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.
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