Microstructure evolution in a pearlitic structured high carbon steel during equal channel angular pressingChinese Full Text
GUO Zhi-qiang1,XIONG Yi1,2,HE Hong-yu1,LU Yan-jun3(1.School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471003,China; 2.Henan Key Laboratory of Advanced Non-Ferrous Metals,Luoyang 471003,China; 3.Guangzhou Civil Aviation College,Aircraft Maintenance Engineering College,Guangzhou 510403,China)
Abstract: A T8 steel with a fully pearlitic structure was studied by equal channel angular pressing（ECAP） via route Bc at 650 ℃.The microstructure evolution of the cementite lamellae after processing was analyzed by SEM,TEM and atomic force microscopy.The results show that the cementite in the pearlite has higher plastic deformation capability.The severe shear deformation of ECAP is accommodated by bending,shearing and shearing fracture etc in the pearlite lamellae.After four passes,an ultrafine microduplex structure（ferrite + cementite） with a grain size at the sub-micrometer level is observed.The cementite particle size distribution is bimodal.The microstructure evolution of the cementite lamellae is observed in three dimensions and is consistent with the results observed in two dimensions.
- DOI：
10.13289/j.issn.1009-6264.2013.08.016
- Series：
- Subject：
- Classification Code：
TG379
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