Abstract
The main chemical components of GCr15 bearing steel are Fe, Cr, C, Mn, etc., which are mainly used to produce bearing rings, rolling elements and other rolling bearing manufacturing industries. After more than one hundred years of development, GCr15 material is used for manufacturing bearing components, and it is called “heart of industry” because GCr15 material is one of the best quality steels [1]. After heat treatment, GCr15 material steel has the “most extensive” practicality for various working conditions of the bearing, such as high load capacity, good fatigue resistance, strong wear resistance, and high hardness, better temperature adaptability and so on [2]. This paper first discusses the heat treatment process of GCr15 material, and then analyzes and studies the cracking phenomenon of a certain batch of 1m diameter GCr15 material bearing ring blanks after heat treatment, and focuses on the fracture morphology, chemical composition, microstructure and other phenomena. The analysis found the cause of the crack and improved the original heat treatment process, that is, before quenching, isothermal spheroidizing annealing is used and the spheroidizing annealing temperature is strictly controlled, bainite austempering is used to replace martensite quench tempering after quenching, and finally, the problem is solved through experimental verification.
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