Nano-size Precipitates during Relaxation and Refinement of Bainite
The evolution of dislocations in austenitic region during deformation has a close relationship with the processing of precipitates.During the appropriate relaxation time after being deformed,the strain induced nano-size precipitates can pin the dislocation networks forcefully.The above mentioned experimental results were simulated by Fe-40Ni alloy called austenitic model steel.Therefore,thermo-simulation test,metallographic analysis,quantitative measurement and transmission electron microscope (TEM) technique were used to study the variation of bainite and precipitates during relaxation processing after being deformed in microalloyed steel.The experimental results demonstrate that the microstructures (mixed ultra-fine bainite and martensite) of the tested steel have been refined effectively during relaxation processing.The optimum refinement could be obtained at 60-200s during relaxation processing after being deformed.Meanwhile,the dislocations were pinned by the strain-induced precipitates whose sizes were less than 10nm.The experimental results obtained from the tested steel are in a good agreement with that of the Fe-40Ni alloy simulations.
nano-size precipitates relaxation refinement bainite
YUAN Shaoqiang ZHANG Xiaojuan LIANG Guoli
Department of Electromechanical Engineering, Tangshan College, Tangshan 063000, China
国际会议
中国微米纳米技术学会第14届学术年会、第3届国际年会暨第6届微米纳米技术“创新与产业化国际研讨与展览会(CSMNT2012 & ICMAN2012)
杭州
英文
1-5
2012-11-04（万方平台首次上网日期，不代表论文的发表时间）