Analysis of Microstructure and Orientation in X80 Line Pipe Steels
Microstructures in X80 line pipe were classified by SEM analysis. The experimental results showed that the microstructures in X 80 line pipe steels were complicated consisting of polygonal ferrite, bainite and acicular ferrite. Orientation relation within acicular ferrite was investigated systematically by means of EBSD-OIM. The sub-structures were observed maximum in acicular ferrite which gives high strength and high toughness to line pipe steels. The K-S orientation relation was generally observed between acicular ferrite and austenite during γ →α phase transformation. The low energy CSL boundary characterized by Σ3 orientation relation according to Brandon criterion appeared with higher probability, which was benefit to improve the mechanical properties of line pipe steels. The orientations or texture of initial austenite grains could be deduced based on the Σ3 orientation relationship of acicular ferrite variants.
Acicular ferrite EBSD K-S orientation relation TMCP
JI Ling-kang LI Yang MENG Li LI He-lin
School of Material Science and Engineering, Xi’an Jiaotong University, Xi’an 710049;CNPC Tubular Goo CNPC Tubular Goods Research Institute, Xi’an 710065; School of Material Science and Engineering, Uni School of Material Science and Engineering, University of Science and Technology Beijing , Beijing 1 CNPC Tubular Goods Research Institute, Xi’an 710065
国际会议
The 6th International Conference on High Strength Low Alloy Steels(第六届高强度低合金钢国际会议HSLA Steels2011)
北京
英文
885-888
2011-05-31（万方平台首次上网日期，不代表论文的发表时间）