The Evolution of Hardness Homogeneity in Commercially Pure Ti Processed by ECAP  

作　　者：刘晓燕 ZHAO Xicheng YANG Xirong JIA Jiangping QI Boli 

机构地区：[1]School of Metallurgical Engineering, Xi'an University of Architecture and Technology [2]Xi'an Shaangu Power Co.,Ltd

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2014年第3期578-584,共7页武汉理工大学学报（材料科学英文版）

基　　金：Funded partly by the National Natural Science Foundation of China(No.5043430);Specialized Research Fund for the Doctoral Program of Higher Education of China(No.20116120110012);the Natural Science Foundation of Shaanxi Province of China(No.2010JM6010)

摘　　要：The evolution of hardness homogeneity in commercially pure titanium processed by equal channel angular pressing （ECAP） for up to 4 passes following route C at room temperature using a die of 90° was investigated by recording the microhardness on the cross-sectional and longitudinal planes of each billet. The results show that the hardness increases significantly after the first pass although there is a region of lower hardness on the cross-section running in a band near the bottom surface of the billet, and then increases by very small amounts in subsequent passes. With increasing numbers of passes, the lower hardness region near the bottom surface disappears and the microhardness values are distributed homogeneously throughout the cross- sectional and longitudinal planes after 4 passes of ECAP. The microhardness values in the central regions of the billet are slightly lower than those of the top and bottom surfaces. The results show that good homogeneity may be achieved throughout the billets after 4 passes of ECAP following route C.The evolution of hardness homogeneity in commercially pure titanium processed by equal channel angular pressing （ECAP） for up to 4 passes following route C at room temperature using a die of 90° was investigated by recording the microhardness on the cross-sectional and longitudinal planes of each billet. The results show that the hardness increases significantly after the first pass although there is a region of lower hardness on the cross-section running in a band near the bottom surface of the billet, and then increases by very small amounts in subsequent passes. With increasing numbers of passes, the lower hardness region near the bottom surface disappears and the microhardness values are distributed homogeneously throughout the cross- sectional and longitudinal planes after 4 passes of ECAP. The microhardness values in the central regions of the billet are slightly lower than those of the top and bottom surfaces. The results show that good homogeneity may be achieved throughout the billets after 4 passes of ECAP following route C.

关 键 词：commercially pure titanium equal channel angular pressing HARDNESS HOMOGENEITY 

分 类 号：TG379[金属学及工艺—金属压力加工]