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Microstructure evolution of grade X100 Pipeline under plastic deformation condition

LIHUA QI1,2,* , JING NIU1,2, LONG YANG1, YAORONG FENG1, JIANXUN ZHANG2

Affiliation

  1. Tubular Goods Research Center of CNPC, China
  2. Schools of Material Science and Technology, Xi’An Jiao Tong University, China

Abstract

The effects of plastic deformation on the microstructure evolution of grade X100 pipeline were investigated by SEM , TEM and EBSD test. The result showed that quasi-polygon ferrite deformed firstly under tension stress function, subsequently, both ferrite and granular bainite change remarkably with the value of plastic strain increase. Furthermore, the microscopic orientation concentrates in {110} <111> direction before the deformation, while crystal orientation in {110} and {112} direction enhanced after the deformation. Due to M/A island on the acicular ferrite and the bainite boundary nails the dislocation, it causes the distortion not to be suitable occurs. Under the tension stress function, the inclusion becomes the micro-crack nuclear core, and increases along with the plastic deformation expands, finally connects causes the crack penetration until the expiration.

Keywords

X100 pipeline, Plastic deformation, Inclusion, M/A constitution.

Citation

LIHUA QI, JING NIU, LONG YANG, YAORONG FENG, JIANXUN ZHANG, Microstructure evolution of grade X100 Pipeline under plastic deformation condition, Optoelectronics and Advanced Materials - Rapid Communications, 4, 7, July 2010, pp.1022-1027 (2010).

Submitted at: June 11, 2010

Accepted at: July 14, 2010