Effect of Ti-enriched Carbonitride on Microstructure and Mechanical Properties of X80 Pipeline Steel

J Mater Sci Technol ›› 2010, Vol. 26 ›› Issue (9): 803-809.

• Mechanical and Functional Properties of Materials • Previous Articles Next Articles

Effect of Ti-enriched Carbonitride on Microstructure and Mechanical Properties of X80 Pipeline Steel

DENG Wei

State key laboratory of rolling and automation, Northeastern University, Shenyang 110819, China

Received:2009-06-10 Revised:2009-12-09 Online:2010-09-21 Published:2010-09-21
Contact: DENG Wei
Supported by:
the Fundamental Research Funds for the Central Universities (No. N090607002) and the National Natural Science Foundation of China (No. 51074052)

Abstract

Abstract:

In this study, two API X80 pipeline steels were fabricated by varying Ti additions, and their microstructures and fracture characteristics were analyzed to investigate the effects of Ti-enriched carbonitride on the tensile properties and Charpy impact properties. Lathy bainite, a mass of matensite/austenite (M/A), coarse cubic Ti-enriched inclusions, chain-typed Ti-enriched precipitations, weak toughness and high tensile strength were found as consequences of higher amount of Ti content. Those large scale and chain-typed Ti-enriched carbonitrides are one kind of crack sources during fracture. The negative e®ect of higher amount of Ti on the impact properties is increased with decreased temperature.

Key words: X80 pipeline steel, Ti-enriched carbonitride, Matensite/austenite (M/A) constitute, Impact toughness

Wei Deng, Xiuhua Gao, Dewen Zhao, Linxiu Du, Di Wu, Guodong Wang. Effect of Ti-enriched Carbonitride on Microstructure and Mechanical Properties of X80 Pipeline Steel[J]. J Mater Sci Technol, 2010, 26(9): 803-809.

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Effect of Ti-enriched Carbonitride on Microstructure and Mechanical Properties of X80 Pipeline Steel

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