Phase transformation behavior of proeutectoid cementite in GCr15 bearing steel [GCr15轴承钢先共析渗碳体的相变规律]

作者：Ning Y.-L.; He K.; Liu N.-F.; Li X.-L.; Li L.-J.; Huo X.-D.^*

来源：Transactions of Materials and Heat Treatment, 2019, 40(7): 94-100.

DOI：10.13289/j.issn.1009-6264.2019-0047

• Expansion method
• GCr15 bearing steel
• Metallographic method
• Pearlite phase transformation
• Proeutectoid cementite

It is difficult to measure the phase transition temperature of proeutectoid cementite of bearing steel by expansion method due to the small amount of transformation in the process of phase transformation. In this paper, Gleeble3800 thermal simulation experiment machine was used to study the phase transformation behavior of GCr15 bearing steel at different cooling rates. Firstly, the phase transition temperature range of pearlite is about 550-700 ℃ measured by expansion method. Based on this, the transformation temperature range of proeutectoid cementite is about 700-900 ℃ obtained by metallographic method, and the complete phase transition temperature curve of the GCr15 bearing steel is drawn. On this basis, the scheme of suppressing the formation of proeutectoid cementite by two-stage cooling process is discussed, which provides a basis for on-site production control of network carbide of the GCr15 bearing steel.

• 单位
  华南理工大学