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

被引：0
|
作者：
M. A. Smirnov
I. Yu. Pyshmintsev
A. N. Maltseva
O. V. Mushina
机构：
[1] South Ural State University,
[2] Russian Research Institute of the Pipe Industry,undefined
来源：
Metallurgist | 2012年 / 56卷
关键词：
low-carbon pipe steel; ferrite-bainite microstructure; MA-component; properties;
D O I：
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中图分类号：
学科分类号：
摘要：
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 T50, and resistance to hydrogen embrittlement ∆Ψ/Ψ.
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页码：43 / 51
页数：8
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