A Study on Austenite Catalytic Cryogenic Treatment of Cr-W-Mo-V High Alloy Medium-Upper Carbon Steel

Abstract:

The processing of austenite catalytic cryogenic treatment of two components of Cr-W-Mo-V high alloy medium-upper carbon steels and the effect on the retained austenite transformation and tempering hardness were studied in this paper. The results show that, the effect of austenite catalytic cryogenic treatment of Cr-W-Mo-V high alloy medium-upper carbon steel is better than that of direct cryogenic treatment after quenching, and the content of residual austenite reduced to below 5%, and the hardness improved by 1.5HRC than that of conventional quenching and tempering. The retained austenite catalytic temperature of Cr-W-Mo-V high alloy medium-upper carbon steel merely is higher than 10°C~20°C of the temperature for the highest tempering hardness. Catalytic temperature Tc can be determined by experimental method of conventional quenching and tempering of the steel, in which the microstructure feature is precipitation of M₃C carbide particle of 0.01μm~0.03μm in martensite matrix, and the content of retained austenite decreases evidently. By cryogenic treatment after the austenite catalyzed the retained austenite of quenching are transformed into more martensite, and in the subsequent tempering processing the original quenching martensite and the martensite from retained austenite transformation almost will form synchronous precipitation hardening. Thus the tempering hardness improves evidently as well.

• Periodical: Advanced Materials Research (Volume 936)
• Pages: 1173-1178
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.936.1173
• Online since: June 2014
• Authors: Yong Qing Ma*, Xiao Jing Zhang, Yu Fen Liang, Guo Fang Liu
• Keywords: Austenite Catalytic, Catalytic Temperature, Cryogenic Treatment, High Alloy Medium-Upper Carbon Steel, Precipitation Hardening, Tempering Hardness, Transformation

References

[1] D Mohan, S Renganarayanan, A Kalanidhi, Cryogenic treatment to augment wear resistant of tool and die steels[J], Cryogenics, Vol. 41, Issues 3, March 2001, pp.149-155.

DOI: 10.1016/s0011-2275(01)00065-0

[2] A Mlinan, M Pellizzan, S Gidanella, el, Effect of deep cryogenic treatment on the mechanical properties of tool steels[J], Journal of Materials Processing Technology, Vol. 118, Issues 1-3, 3 December 2001, pp.350-365.

[3] J. Y Huang, Y. T Zhu, X. Z Liao, el, T. E Mitchell, Microstructure of cryogenic treated M2 tool steel[J], Materials Science and Engineering: A, Vol. 339, Issues 1-2, 3 January 2003, pp.241-244.

DOI: 10.1016/s0921-5093(02)00165-x

[4] Hsu Tzu-yao, Martensitic Transformation and Martensite[M], Beijing, Science Press, 1999, pp.593-623 (in Chinese).

[5] Zhang Xiaojing, LiuGuofang, Ma Yongqing, Material and heat treatment of knives of rotary and plane cutting for wood working[J], Heat Treatment of Metals, 2012, 37(7): 114-117(in Chinese).

[6] G. Ghosh, G. B Olson, Simulation of paraequilibrium growth in multicomponent systems[J], Metallurgical and Materials: A, 2001, 32(3): 455-467.

DOI: 10.1007/s11661-001-0062-5

[7] CHEN Ying, CHEN Zai-zhi, DONG Han, el, Microstructure and mechanical properties of tempered deep cryogenic treated 4Cr5MoSiV1 steel[J], Journal of Iron and Steel Research, Vol. 18 No5, 2006, pp.29-32 (in Chinese).

[8] D. V. Shtansky, G. Inden, Phase transfomation in Fe-Mo-C and Fe-W-C steels-I. The structural evolution during tempering at 700℃[J], Acta Materialia, 1997, 45(7): 2861-2878.

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

[9] Yongqing Ma, Hongtao Gao, Yufen Liang, Xiaojing Zhang，Secondary hardening during tempering of Cr-W-Mo-V high alloy medium-upper carbon steel and its hardness forecast[J], Advanced Materials Research, 2012, Vols, 415-417, 813-818.

DOI: 10.4028/www.scientific.net/amr.415-417.813