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A new method of characterizing equivalent strain for equal channel angular processing

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ZHAO Jun(ÕÔ  ¾ü), WANG Zhen-hua(ÍõÕñ»ª), SUN Shu-hua(ËïÊ绪),
ZHAO De-li(ÕÔµÂÀû), REN Li-guo(ÈÎÀû¹ú), FU Wan-tang(¸µÍòÌÃ)
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1. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University,
Qinhuangdao 066004, China;
2. College of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004, China;
3. North China Institute of Aerospace Engineering, Langfang 065000, China)

Abstract: In order to establish the quantitative  relationship between equivalent strain and the performance index of the deformed
material within the range of certain passes for equal channel angular processing (ECAP), a new approach to characterize the
equivalent strain was proposed. The results show that there exists better accordance between mechanical property (such as hardness
or strength) and equivalent strain after  rolling and ECAP in a certain range of deformation amount, and Gauss equation can be
satisfied among the equivalent strain and the mechanical properties for ECAP. Through regression analysis on the data of hardness
and strength after the deformation, a more generalized expression of equivalent strain for ECAP is proposed as: ¦Å=k0exp[−(k1M−k2)2],
where M is the strength or hardness of the material, k1 is the modified coefficient (k1 (0, ¡Ê  1)), k0and k2 are two parameters dependent on the critical strain and mechanical property that reaches saturation state for the material, respectively. In this expression the equivalent strain for ECAP is characterized novelly through the mechanical parameter relating to material property rather than  the classical geometry equation.

Key words: equal channel angular processing (ECAP); equivalent strain; mechanical property; characterizing method
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xiaogounihao(½ð±Ò+1):лл 2010-06-09 12:58:04
zjys5887(½ð±Ò+20):лл°ïÖú£¬×£Äú¹¤×÷˳Àû¡£ 2010-06-09 14:10:35
Òѱ»SCI&EI¼ìË÷
SCI:
±êÌâ: A new method of characterizing equivalent strain for equal channel angular processing
×÷Õß: Zhao, J; Wang, ZH; Sun, SH, et al.
À´Ô´³ö°æÎï: JOURNAL OF CENTRAL SOUTH UNIVERSITY OF TECHNOLOGY   ¾í: 16   ÆÚ: 3   Ò³: 349-353   ³ö°æÄê: 2009
±»ÒýƵ´Î: 0
IDS ºÅ: 455RJ
ISSN: 1005-9784
DOI: 10.1007/s11771-009-0059-6


EI:
A new method of characterizing equivalent strain for equal channel angular processing
Zhao, Jun (State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China); Wang, Zhen-Hua; Sun, Shu-Hua; Zhao, De-Li; Ren, Li-Guo; Fu, Wan-Tang Source: Journal of Central South University of Technology (English Edition), v 16, n 3, p 349-353, June 2009
Database: Compendex

        DOI:                10.1007/s11771-009-0059-6
        Database:                Compendex

[ Last edited by truewz on 2010-6-9 at 12:24 ]
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