Effect of ferrite-bainite structure on the properties of high-strength pipe steel

Smirnov, M.; Pyshmintsev, I.; Maltseva, A.; Mushina, O.
January 2012
Metallurgist;Jan2012, Vol. 56 Issue 1/2, p43
Academic Journal
Mechanical properties of pipe steel 07G2MFB are studied after cooling from the austenitic region at rates of 0.9-32�C/sec making it possible to obtain a ferrite-bainite structure with different ratios of structural components. It is shown that formation of a predominantly bainitic structure formed with high cooling rates provides less crack resistance with static loading than a structure in which polygonal ferrite predominates. A bainitic structure is preferable with dynamic loading. Treatment leading to formation of coarse islands of martensite-austenite (MA) component within a ferrite-bainite structure has an unfavorable effect on crack tip opening displacement CTOD, ductile-brittle transition temperature T, and resistance to hydrogen embrittlement ??/?.


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