THE EFFECT OF TEMPERING PROCESS ON MICROSTRUCTURAL CHARACTERISTICS AND MECHANICAL PROPERTIES OF INDUCTION BEND PIPE
The heat treatment during manufacturing process of induction bend pipe had been simulated.The evolutions of ferrite,M/A island and substructure after tempering at 500~700℃ were characterized by means of optical microscopy,positron annihilation technique,SEM,TEM,XRD and EBSD.The mechanical performance was evaluated by tensile test,Charpy V-notch impact test(-20℃)and Vickers hardness test(10 kgf).Microstructure observations showed that fine and homogenous M/A islands as well as dislocation packages in quasi-polygonal ferrite matrix after tempering at 600~650℃ generated optimal combination of strength and toughness.After tempering at 700℃,the yield strength decreased dramatically.EBSD analysis indicated that the effective grain size diminished with the tempering temperature increasing.It could cause more energy cost during microcrack propagation process with subsequent improvement in impact toughness.Dislocation analysis suggested that the decrease and pile-up of dislocation benefited the combination of strength and toughness.
Bend pipe Tempering Microstructure Mechanical property Dislocation EBSD
Hao Yu Tao Zhou
School of Materials Science and Engineering,University of Science and Technology Beijing,No.30 Xueyu School of Materials Science and Engineering,University of Science and Technology Beijing,No.30 Xueyu
国际会议
Energy Materials 2014(第一届能源材料国际会议)
西安
英文
651-656
2014-11-04（万方平台首次上网日期，不代表论文的发表时间）