典型文献
Effect of Cooling Rate on Microstructure and Effective Grain Size fora Ni-Cr-Mo-B High-Strength Steel
文献摘要：
The effect of cooling rate on microstructure and effective grain size(EGS)of a Ni-Cr-Mo-B high-strength steel has been studied by dilatometer,field emission scanning electron microscopy(FESEM),transmission electron microscopy(TEM)and electron backscattered diffraction(EBSD).The results show that the microstructure of the Ni-Cr-Mo-B steel is dependent on cooling rate in the following sequence:lath martensite(LM),mixed LM and lath bainite(LB),mixed LB and granular bainite(GB)and GB.The critical cooling rates for appearance of LB and GB are about 10℃/s and 0.5℃/s,respectively.The LM(＞10℃/s)consists of few blocky regions with a width of several micros.Compared with the lath regions,the blocky regions in LM form at higher actual transformation temperatures during cooling.The blocky region area percentage in LM keeps almost constant about 8％at different cooling rates(＞10℃/s)due to similar martensite transformation start-ing temperature(Ms).The LB percentage in mixed LM/LB increases gradually with decreasing cooling rate(10-0.5℃/s).The EBSD results show that different microstructures have different EGS.The mixed LM/LB exhibits the smallest EGS due to the separation of the prior austenite grains by the pre-formed LB and the refinement of the LM.Meanwhile,the mixed LM/LB at different cooling rates(10-0.5℃/s)exhibits almost the same EGS because the LB and LM in the mixed LM/LB have a similar high-angle grain boundary density and similar EGS.Because the blocky regions contain few high-angle grain boundaries and have similar area percentages in the LM,the LM at different cooling rates(＞10℃/s)exhibits almost the same EGS.The ferrite in GB exhibits as a whole with few high-angle grain boundaries;thus,the mixed LB/GB exhibits the largest EGS.
文献关键词：
中图分类号：
作者姓名：
Shouqing Zhang;Xiaofeng Hu;Haichang Jiang;Lijian Rong
作者机构：
CAS Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China
文献出处：
引用格式：
[1]Shouqing Zhang;Xiaofeng Hu;Haichang Jiang;Lijian Rong-.Effect of Cooling Rate on Microstructure and Effective Grain Size fora Ni-Cr-Mo-B High-Strength Steel)[J].金属学报（英文版）,2022(11):1862-1872
A类：
dilatometer
B类：
Cooling,Rate,Microstructure,Effective,Grain,Size,fora,Mo,High,Strength,Steel,cooling,effective,size,EGS,strength,steel,has,been,studied,by,field,emission,scanning,electron,microscopy,FESEM,transmission,TEM,backscattered,diffraction,EBSD,results,show,that,dependent,following,sequence,lath,martensite,LM,mixed,bainite,LB,granular,critical,rates,appearance,about,respectively,consists,few,blocky,regions,width,several,Compared,higher,actual,transformation,temperatures,during,area,keeps,almost,constant,different,due,similar,start,Ms,increases,gradually,decreasing,microstructures,have,exhibits,smallest,separation,prior,austenite,grains,pre,formed,refinement,Meanwhile,same,because,angle,boundary,density,Because,contain,boundaries,percentages,ferrite,whole,thus,largest
AB值：
0.398172
相似文献
机标中图分类号，由域田数据科技根据网络公开资料自动分析生成，仅供学习研究参考。
