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| Analysis of Plasticity Deformation by In-Situ Means of High Strength Pipeline |
| QI Li-Hua-1, ZHANG Wei-Wei-1, LIU Xiao-Feng-2, JI Ling-Kang-1, CHI Qiang-1, XIONG Qing-Ren-1 |
| （1.Tubular Goods Research Center of CNPC, Xi’an 710065, China; 2.China Petroleum Pipeline Engineering Third Branch, Zhengzhou 451450, China) |
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Abstract X100 and X80 high grade pipeline steel dynamic plastic deformation behavior was investigated, by means of insitu SEM and insitu EEBSD analysis. The results show that, the microstructure of the two pipelines is mainly composed of acicular ferrite, granular bainite and M/A island. During the tensile process, acicular ferrite deforms firstly of the X100 microstructure. With the strain increase, the variable accumulation of the acicular ferrite leads to granular bainite deformation. Subsequently, inclusion nucleates micro crack nucleation core and extends with the externally applied stress increase. Micro-cracks connection leads to crack through the matrix until failure. Correspondingly, during insitu tensile process, the slide bands of the microstructure of the X80 pipeline run through the grains and deform cooperatively till fracture. By in-situ EBSD orientation of the X100 pipe, crystals after deformation rotate along the rolling surface for the {111} plane direction along the direction of tensile deformation.
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Received: 19 December 2011
Published: 28 September 2012
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