교차롤압연된 Ni-10Cr 합금의 결정립 미세화와 성형성 향상 = Enhancement of Grain Refinement and Formability of Cross-Roll-Rolled Ni-10Cr Alloy

다국어 초록 (Multilingual Abstract)

This study evaluated the enhancement of microstructural and mechanical properties of a cross rolled Ni-10Cr alloy, comparing with conventionally rolled material. Cold rolling was carried out to 90% thickness reduction and the specimens were subsequently annealed at $700^{\circ}C$ for 30 min to obtain a fully recrystallized microstructure. Cross roll rolling was carried out at a tilted roll mill condition of $5^{\circ}$ from the transverse direction in the RD-TD plane. In order to observe the deformed microstructures of the cold rolled materials, transmission electron microscopy was employed. For annealed materials after rolling, in order to investigate the grain boundary characteristic distributions, an electron back-scattering diffraction technique was applied. Application of cold rolling to the Ni-10Cr alloy contributed to notable grain refinement, and consequently the average grain size was refined from 135 ${\mu}m$ in the initial material to 9.4 and 4.2 ${\mu}m$ in conventionally rolled and cross rolled materials, respectively, thus showing more significantly refined grains in the cross rolled material. This refined grain size led to enhanced mechanical properties such as yield and tensile strengths, with slightly higher values in the cross rolled material. Furthermore, the <111>//ND texture in the CRR material was better developed compared to that of the CR material, which contributed to enhanced mechanical properties and formability.

참고문헌 (Reference)

1 G. S. Was, 46 : 319-, 1990

2 W. J. Kim, 49 : 333-, 2003

3 D. G. Brandon, 14 : 1479-, 1966

4 K. Neishi, 325 : 54-, 2002

5 S. Komura, 14 : 4044-, 1999

6 Y. Chino, 473 : 195-, 2007

7 J. J. Nah, 58 : 500-, 2008

8 A. Mishra, 55 : 13-, 2007

9 A. Kundu, 58 : 235-, 2008

10 C. M. Cepeda-Jiménez, 528 : 7938-, 2011

11 K. H. Song, 52 : 1070-, 2011

12 J. B. Lee, 161 : 166-, 2009

13 T. Hebesberger, 53 : 393-, 2005

14 Y. Chino, 441 : 349-, 2006

15 P. Van Houtte, Netherlands Society for Materials Science 7-, 1984

16 S. H. Kim, 508 : 121-, 2009

17 D. G. Kim, 509 : 9413-, 2011

18 이성희, "저변형률속도에서 ARB가공된 무산소동의 미세조직 및 기계적 성질" 한국재료학회 17 (17): 521-525, 2007

19 W. F. Smith, "Structure and Properties of Engineering Alloys" McGraw-Hill 498-, 1994