Network Carbide Inheritance during Heat Treatment Process of Large Shield Machine Bearing Steel GCr15SiMn

Dan Zhang; Le Yu Zhou; Chao Lei Zhang; Chao Huang; Min Zhao; Ya Zheng Liu

doi:10.4028/www.scientific.net/MSF.817.115

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HomeMaterials Science ForumMaterials Science Forum Vol. 817Network Carbide Inheritance during Heat Treatment...

Network Carbide Inheritance during Heat Treatment Process of Large Shield Machine Bearing Steel GCr15SiMn

Abstract:

Network carbide inheritance during heat treatment process of large shield machine bearing steel GCr15SiMn was investigated by heat treatment experiments and quantitative metallographic. Samples with the proeutectoid cementite network thickness in the range of 0.19~0.54 μm were obtained by changing austenitizing temperature and soaking time of pearlite transformation. The results show that the network in hot rolled bar can be improved when the pre-heat treatment temperature is 950 °C. When the network thickness is above 0.40 μm, the undissolved cementite networks present in microstructures after quenching and tempering. In a Chinese standard, the network grades are 1.5 and 3.0 degree when the networks thickness are 0.40 μm and 0.54 μm, respectively. The critical network thickness that can be eliminated by heat treatment is 0.29 μm.

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Periodical:

Materials Science Forum (Volume 817)

Pages:

115-120

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.817.115

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Online since:

April 2015

Authors:

Dan Zhang*, Le Yu Zhou, Chao Lei Zhang, Chao Huang, Min Zhao, Ya Zheng Liu

Keywords:

GCr15SiMn Steel, Heat Treatment, Proeutectoid Cementite Network, Structure Inheritance

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