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Low-temperature martensitic transformation and deep cryogenic treatment of a tool steel

机译:工具钢的低温马氏体转变和深冷处理

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摘要

The tool steel X220CrVMo 13-4 (DIN 1.2380) containing (mass%) 2.2C, 13Cr, 4V, 1Mo and the binary alloy Fe-2.03 mass% C were studied using transmission electron microscopy, Moessbauer spectroscopy, X-ray diffraction and internal friction with the aim of shedding light on processes occurring during deep cryogenic treatment. It is shown that the carbon atoms are essentially immobile at temperatures below -50 ℃, whereas carbon clustering in the virgin martensite occurs during heating above this temperature. An increase in the density of dislocations, the capture of immobile carbon atoms by moving dislocations, the strain-induced partial dissolution of the carbide phase, and the abnormally low tetragonality of the virgin martensite are found and interpreted in terms of plastic deformation that occurs during martensitic transformation at low temperatures where the virgin martensite is sufficiently ductile.
机译:使用透射电子显微镜,Moessbauer光谱学,X射线衍射和内标法研究了包含(质量%)2.2C,13Cr,4V,1Mo和二元合金Fe-2.03质量%C的X220CrVMo 13-4(DIN 1.2380)工具钢摩擦力,目的是揭示深低温处理过程中发生的过程。结果表明,碳原子在低于-50℃的温度下基本上是不动的,而原始马氏体中的碳团簇则在高于该温度的加热过程中发生。发现并解释了位错密度的增加,通过移动位错捕获不活动的碳原子,由应变引起的碳化物相的部分溶解以及原始马氏体的异常低四方性,并根据在此过程中发生的塑性变形进行了解释。原始马氏体足够延展的低温下的马氏体转变。

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