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Effect of Nitrogen‐Substituted Carbon on Thermal Stability of Cr‐Mo‐V Hot‐Working Die Steel
Steel Research International ( IF 2.2 ) Pub Date : 2020-07-21 , DOI: 10.1002/srin.202000206
Lihao Li 1 , Wei Zhang 2 , Jinbo Gu 1 , Wang Li 1 , Fanghong Xu 2 , Jingyuan Li 3
Affiliation  

To extend service life of Cr‐Mo‐V hot‐working die steel, a method of alloying with nitrogen‐substituted carbon is proposed. The mechanical properties of the test steels in the long‐time heating and holding process are measured. The effect of nitrogen‐substituted carbon on thermal stability is characterized and analyzed by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Thermo‐Calc. The results show that the ratio of N in V(C,N) can be increased by nitrogen‐substituted carbon at high temperature, which significantly improves its stability. As a result, it can not only refine the grain but also broaden the austenitizing temperature range and promote the complete solution of alloy elements such as Cr, Mo. In the process of long‐term heating and insulation, nitrogen‐substituted carbon can effectively reduce the precipitation of harmful carbides and the coarsening rate by raising the activation energy of tempering transformation with 20.0 kJ mol−1, and increase the precipitation of the main strengthening phase V(C,N). Nitrogen‐substituted carbon, as an effective alloying method, innovatively improves thermal stability and service life of Cr‐Mo‐V hot‐working die steel.

中文翻译:

氮取代碳对Cr-Mo-V热作模具钢热稳定性的影响

为了延长Cr-Mo-V热作模具钢的使用寿命,提出了一种用氮取代碳合金化的方法。测量了长时间加热和保温过程中测试钢的机械性能。用扫描电子显微镜(SEM),透射电子显微镜(TEM)和Thermo-Calc表征并分析了氮取代碳对热稳定性的影响。结果表明,在高温下,氮取代的碳可以增加V(C,N)中N的比例,从而显着提高其稳定性。结果,它不仅可以细化晶粒,而且可以扩大奥氏体化温度范围,并促进Cr,Mo等合金元素的完全固溶。在长期加热和绝缘的过程中,-1,并增加主强化相V(C,N)的沉淀。氮取代的碳作为一种有效的合金化方法,可以创新地提高Cr-Mo-V热作模具钢的热稳定性和使用寿命。
更新日期:2020-07-21
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