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Study on the Anisotropic Size Change by Austenitizing and Tempering Heat Treatment of STD11 Tool Steel Using Dilatometry  

Hong, Ki-Jung (Reliability Assessment Research Center, RIST)
Kang, Won-Guk (Andong National University, School of Advanced Materials Engineering)
Song, Jin-Hwa (Reliability Assessment Research Center, RIST)
Chung, In-Sang (School of Materials Science and Engineering, Kyungpook National University)
Lee, Kee-Ahn (Andong National University, School of Advanced Materials Engineering)
Publication Information
Korean Journal of Metals and Materials / v.46, no.12, 2008 , pp. 800-808 More about this Journal
Abstract
Heat treatment is an important step for tool manufacture, but unavoidably generates dimensional distortion. This study investigated the continuous dimensional change and the anisotropic behavior of STD11 tool steel during austenitizing and tempering heat treatment especially using quenching dilatometer. Dilatometric results represented that the dimensional change along longitudinal direction was larger than that along transverse direction. Anisotropic phase transformation strain was produced in forged STD11 tool steel during heat treatment. Anisotropic dimensional change increased with increasing austenitizing temperature. After tempering, anisotropic distortion was partially reduced. FactSage thermodynamic equilibrium phase simulation and microstructural observation (FE-SEM, TEM) showed that large ($7{\sim}80{\mu}m$) elongated $M_7C_3$ carbides could be formed along rolling direction. The resolution of elongated carbides during austenitizing was found to be related with the change of martensite transformation temperature after heat treatment. Anisotropic size change of STD11 tool steel was mainly attributed to large elongated carbides produced during rolling process. Using dilatometric and metallographic examination, the possible mechanism of the anisotropic size change was also discussed.
Keywords
anisotropy; STD11; tool steel; quenching dilatometer; austenitizing and tempering;
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  • Reference
1 W. R. Jones, Proc. 16th ASM Heat Treating Conference, p. 161, Materials Park, ASM International (1996)
2 F. Hoffmann, T. Lbben, and P. Mayr, Heat Treatment of Metals 26, 63 (1999)
3 J. Wei, O. Kessler, M. Hunkel, F. Hoffmann, and P. Mayr, Steel research int. 75, 759 (2004)   DOI
4 S. G. Fletcher, Met. Treating 19, 3 (1968)
5 R. B. Dixon, Proc. 16th ASM Heat Treating Conference, p. 187, Materials Park, ASM International (1996)
6 N. Hirose, S. Yamato, and K. Itakura, Proc. 37th Japan Congress on Materials Research 33, 188 (1992)
7 T. Nishimura, J. The Japan Society for Heat Treatment 41, 327 (2001)
8 J. Wei, O. Kessler, M. Hunkel, F. Hoffmann, and P. Mayr, Materials Science and Technology 20, 909 (2004)   DOI   ScienceOn
9 S. J. Oh, S. J. Kwon, and H. S. Oh, J. Kor. Inst. Met & Mater. 37, 931 (1999)
10 J. Wei, O. Kessler, F. Hoffmann and P. Mayr, Proc. Fourth International Conference on Quenching and the Control of Distortion, p.347 (2003)
11 H. Berns and H. Pinto, the 5th int. Conf. on Quenching and Control of Distortion and the European Conf. on Heat Treatment, p.221 (2007)
12 J. Krejicik , Conference on Heat Treatment'81 p.15 (1981)
13 J. Frehser, Arch. Eisenhitt. 24, 483 (1953)