Alloy Design and Application for Avoiding Carbide Network of CrWMn Steel by Phase Equilibrium Thermodynamic Method

Abstract:

By the equilibrium phases of the steels with temperature, the causation of being carbide network of CrWMn steel frequently in the manufacture was analyzed, and an alloy design for avoiding carbide network of CrWMn steel was researched. The analyse and research show that in austenite area the boundary precipitation of M₃C and M₆C carbides during cooling process after forging or hot rolling is preferential origin of carbide network, and in later ferrite area the precipitation and congregation of the carbides should lead on network aggravation. When CrWMn steel adding 0.3~0.4Mo as supplement, in austenite area M₃C carbide disappears and M₂₃C₆ carbide increases, and it is conceivable of lightenning congregation to austenite boundary as the transformation of M₂₃C₆ and M₆C reciprocally, and the distribution of diversified carbides should become fine too. The practice results show that the carbide network of CrWMnMo_0.35 steel is avoided under normal forging or hot rolling conditions, and the hardness after quenching at 850°C and tempering at 200°C is HRC62~63, which is agreement with alloy design forecast. The experiment and application show that the performance of CrWMnMo_0.35 steel is better than that of customary CrWMn steel for machinery knives.

• Periodical: Advanced Materials Research (Volumes 690-693)
• Pages: 91-96
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.690-693.91
• Online since: May 2013
• Authors: Yong Qing Ma, Xiao Jing Zhang, Yu Fen Liang
• Keywords: Alloy Design, Carbide Network, CrWMn Steel, CrWMnMo_{0.35 /Sub>Steel}, Equilibrium Phases, Heat Treatment, Hot Rolling, Tempering Hardness

References

[1] Yongqing Ma, Yang Zhang, Yumei Dai, Alloy Design and Practice of High Carbon Alloy Steels with Ultra-fine Carbide, Advanced Materials Research, 2011,Vols. 295-297, pp.1479-1484.

DOI: 10.4028/www.scientific.net/amr.295-297.1479

[2] MA Yongqing, ZHANG Yang, DAI Yumei, et al, Transformation and Morphology of Carbides in Cr-W-Mo-V High Carbon Medium-alloy Steels During α↔γ Transforming, Heat Treatment of Metals[J], 2006, 31(supplement):43-45. in Chinese.

[3] Pan Jinsheng, Tong Jianmin, Tian Minbo, Fundamentals of Materials Science [M], Beijing, Tsinghua University Publishing, 1998,6,549-589. in Chinese.

[4] D. V. Shtansky and G.. Inden, Phase Transformation in Fe-Mo-C and Fe-W-C Steels--I. The Structuctural Evolution during Temerring at 700℃[J], Acta Materialia Vol. 45 n.7(1997), pp.2861-2878.

DOI: 10.1016/s1359-6454(96)00375-8

[5] D. V. Shtansky and G.. Inden, Phase Transformation in Fe-Mo-C and Fe-W-C Steels--II. Eutectoid Reaction of M23C6 Carbide Decomposition during Austenitization [J], Acta Materialia Vol. 45 n.7(1997), pp.2879-2895.

DOI: 10.1016/s1359-6454(96)00374-6

[6] MA Yongqing, Phase equilibrium method of alloy system and its application[M], Dalian, Dalian Maritime University Publishing, 2010, 113-127. in Chinese.

[7] Yongqing Ma, Yumei Dai, Yufen Liang, Xiaojing Zhang, Temper-Resistance of Cr-W-Mo-V High Carbon Medium Alloy Steel and Its Hardness Forecast, Advanced Materials Research, 2012,Vols. 503-504 , pp.591-596.

DOI: 10.4028/www.scientific.net/amr.503-504.591