Hydrogen Effects on the Microstructure Evolution of High Manganese Steel during Tensile Deformation
Hydrogen effects on the microstructure evolution of tensile deformed Fe-22Mn-0.6C TWIP steel have been characterized using coupled electron channeling contrast imaging (ECCI) and electron backscatter diffraction (EBSD) techniques.While ECCI observations revealed the evolution of dislocations,stacking faults and deformation twins with respect to the developed strain gradient,EBSD analysis gave additional information on the crystallographic orientation relevance.The results show that diffusive hydrogen at the level of 20 ppm has a conspicuous effect on activating multiple deformation twinning systems in the grains close to the <111>//RD and <111>…<001>//RD orientations in the investigated steel.In addition,hydrogen also raises the twinning density and facilitates the growth of twinning lamellar from thinner to thicker ones.Eventually,the interaction between deformation twins and grain boundaries leads to deteriorated resistance to delayed fracture in the Fe-Mn-C grades.
hydrogen deformation mechanisms TWIP steel
GUO Xiaofei ZAEFFERER Stefan ARCHIE Fady WU Hao PRAHI Ulrich BLECK Wolfgang
Steel Institute, RWTH Aachen University, Aachen,Germany Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf,Germany
国际会议
成都
英文
151-154
2016-11-16（万方平台首次上网日期，不代表论文的发表时间）