Next Article in Journal
Previous Article in Journal
Metals 2014, 4(1), 55-63; doi:10.3390/met4010055
Article

Effect of ECAP Deformation Route on the Degree of Anisotropy of Microstructure of Extremely Low CN Fe-20mass%Cr Alloy

1
, 2,*  and 2
Received: 20 December 2013; in revised form: 13 February 2014 / Accepted: 20 February 2014 / Published: 27 February 2014
View Full-Text   |   Download PDF [3106 KB, uploaded 27 February 2014]   |   Browse Figures
Abstract: The effect of the deformation route on the microstructural evolution of low CN Fe-20%Cr alloy by ECAP has been investigated, with a focus on the anisotropy of the microstructure. This alloy was pressed at 423 K from one, two and four passes via routes A, Bc and C, and the microstructure was observed three dimensionally. As has been acknowledged, overall grain fragmentation proceeded most effectively in route Bc, and the highest hardness was obtained following routes C and A. However, the degree of anisotropy of microstructural development is different among the three deformation routes. The fractions of the high angle grain boundary (HAGB) and mean grain boundary misorientation were high and nearly isotropic in route Bc, whereas they are considerably low in one direction and highly anisotropic in routes A and C. Most importantly, those two parameters and hardness are the highest in route C if limited to the transverse direction, i.e., normal to both the insert and extruding directions. This result contrasts with FCC materials which most papers report as having the highest fraction of HAGB in route Bc. This result can be interpreted by the slip irreversibility of screw dislocations which is predominant in BCC metals.
Keywords: EBSD; steel; equal-channel angular processing; grain boundaries; anisotropy EBSD; steel; equal-channel angular processing; grain boundaries; anisotropy
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Export to BibTeX |
EndNote


MDPI and ACS Style

Rifai, M.; Miyamoto, H.; Fujiwara, H. Effect of ECAP Deformation Route on the Degree of Anisotropy of Microstructure of Extremely Low CN Fe-20mass%Cr Alloy. Metals 2014, 4, 55-63.

AMA Style

Rifai M, Miyamoto H, Fujiwara H. Effect of ECAP Deformation Route on the Degree of Anisotropy of Microstructure of Extremely Low CN Fe-20mass%Cr Alloy. Metals. 2014; 4(1):55-63.

Chicago/Turabian Style

Rifai, Muhammad; Miyamoto, Hiroyuki; Fujiwara, Hiroshi. 2014. "Effect of ECAP Deformation Route on the Degree of Anisotropy of Microstructure of Extremely Low CN Fe-20mass%Cr Alloy." Metals 4, no. 1: 55-63.


Metals EISSN 2075-4701 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert