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Effect of Carbide Distribution on the Grain Refinement in the Steel for Large‐Size Bearing Ring
Author(s) -
Dong Zhengqiang,
Jiang Bo,
Mei Zhen,
Zhang Chaolei,
Zhou Leyu,
Liu Yazheng
Publication year - 2016
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201500212
Subject(s) - carbide , materials science , grain boundary , grain size , metallurgy , diffusion , grain boundary strengthening , grain growth , carbon fibers , microstructure , composite material , thermodynamics , physics , composite number
The effect of carbide distribution on the grain refinement in the steel for large‐size bearing ring is investigated. It is observed that Ni‐containing steel has an obvious grain refinement below 1050 °C, whereas its grain growth trend is steeper than that of Ni‐free steel above 1050 °C. No evident segregation of Ni is observed, whereas the pinning effect of carbides distributed along grain boundaries is advantageous for the grain refinement. It is found that Ni addition could affect the type of carbides and contribute to decreasing the size of carbides via accelerating the diffusion of carbon. A stronger pinning effect with smaller carbides distributed along grain boundaries could be obtained, which is beneficial to grain refinement with Ni addition in small amounts.