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Effects of Nano-sized Microalloyed Carbonitrides and High-density Pinned Dislocations on Sulfide Stress Cracking Resistance of Pipeline Steels

Published online by Cambridge University Press:  03 March 2011

Ming-Chun Zhao  and
Ke Yang
Ming-Chun Zhao*
Affiliation:
Steel Research Center, National Institute for Materials Science, Tsukuba 305 0047, Japan
Ke Yang
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
*
a) Address all correspondence to this author. e-mail: mczhao@imr.ac.cn or zmczhao@yahoo.com.cn
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Abstract

Sulfide stress cracking (SSC) resistance was investigated by comparing acicular ferrite (AF) and ferrite-pearlite (FP) in a microalloyed steel and in a non-microalloyedsteel. In microalloyed steel, AF exhibited better SSC resistance than FP, while in non-microalloyed steel, AF presented far worse SSC resistance than FP. In microalloyed steel, nano-sized carbonitrides and high-density pinned dislocations in AF were analyzed to behave as innocuous hydrogen traps, offering numerous sites for hydrogen redistribution and modifying critical cracking conditions. Dislocations in AF of microalloyed steel in the final analysis are attributed to pinning by the nano-sized carbonitrides.

Keywords

DislocationsEmbrittlementSecond phases
Type
Rapid Communications
Information
Journal of Materials Research , Volume 20 , Issue 9 , September 2005 , pp. 2248 - 2251
Copyright
Copyright © Materials Research Society 2005

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