Secondary Hardening during Tempering of Cr-W-Mo-V High Alloy Medium-Upper Carbon Steel and its Hardness Forecast

Author:

Ma Yong Qing1,Gao Hong Tao1,Liang Yu Fen2,Zhang Xiao Jing3

Affiliation:

1. Dalian Maritime University

2. Changzhou Machinery Blade CO.LED

3. Changzhou Machinery Blade CO. LTD.

Abstract

Along with increasing W and Mo contents in Cr-W-Mo-V high alloy medium-upper carbon steels, the maximal hardness of secondary hardening during tempering is increasing gradually and arrives to 66.8HRC, and the congruent quenching temperature and the tempering temperature corresponding to maximal hardness are ascending. The quenching microstructure of experimental steels is matrix and a small quantity of undissolved carbides when the hardness is maximal, wich is corresponding to tempering temperature of remnant austenitic decomposing acutely. The precipitation of M6C and MC carbides was detected, and M7C3 and M3C carbides was detected too. But M23C6 carbide did not appear and M2C carbide was detected undistinguishably. The temperature range of tempering maximal hardness is 500°C-550°C, and an exact temperature is opposite to the mass fraction ratio of equilibrium carbide phases at the temperature. The tempering hardness value can be obtained from HS= a(1+b)/(0.0127a+0.00297), in which a is square root of saturation level of the carbon in the matrix and b is correction factor having something to do with alloy elements of carbide precipitation.

Publisher

Trans Tech Publications, Ltd.

Subject

General Engineering

Reference8 articles.

1. Ma Yong-qing, Zhang Yang, Gao Hongtao et al, The calculation of quenching hardness and tempering hardness for Cr-W-Mo-V alloy steel[J], Physics Examination and Testing, 2007,25(3): 15-18(in Chinese).

2. Ma Yong-qing, Zhang Yang, Dai Yumei, Application of phase equilibrium thermodynamic method in alloy design for high carbon alloy steel with ultra fine carbides[J]. WORLD SCI-TECH R&D Vol. 31 n. 1(2009), pp.8-13 (in Chinese).

3. Ma Yong-qing, Phase equilibrium thermodynamic method of alloy system and its application [M], Dalian Maritime University Publishing, 2010(in Chinese).

4. 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.

5. D.V. Shtansky, 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, 1997, 45(7): 2879-2895.

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