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Combined Effect of Phosphorus Grain Boundary Segregation, Yield Strength, and Grain Size on Embrittlement of a Cr–Mo Low‐Alloy Steel
Author(s) -
Zhao Yu,
Song Shenhua
Publication year - 2018
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.201800096
Subject(s) - materials science , grain boundary , embrittlement , phosphorus , yield (engineering) , alloy , grain size , metallurgy , grain boundary strengthening , austenite , composite material , microstructure
The dependence of fracture appearance transition temperature (FATT) on phosphorus grain boundary segregation, yield strength, and grain size is experimentally evaluated for a 2.25Cr–1Mo low‐alloy steel. Both the phosphorus boundary segregation and yield strength are directly correlated to the FATT of the steel. However, the prior austenite grain size is not directly linked to the FATT although it influences phosphorus boundary segregation and yield strength. The FATT exhibits linear relations to phosphorus segregation concentration and yield strength, but there is no synergistic effect between these two entities. Based on the measurements, an embrittlement equation is established, which is expressed as FATT(°C) = 0.25 σ s + 2.64 C P –270, where σ s is the yield strength in MPa and C P is the phosphorus boundary concentration in at%. The calculated FATTs have a good agreement with the measured ones.