Analysis of Distortion Mechanism of a Cold Work Tool Steel During Quenching and Deep Cryogenic Treatment

다국어 초록 (Multilingual Abstract)

The microstructure distribution and distortion behavior of a cold work tool steel cylindrical specimen with keyway afterquenching (QT) and deep cryogenic treatment (DCT) were evaluated in detail. Furthermore, from the viewpoints of thermaland volumetric strains, an attempt was made to reveal its distortion mechanism during QT and DCT. The results suggestthat DCT can effectively improve the dimensional stability of specimen and eliminate the distortion caused by QT. Duringthe QT and DCT processes, the bending direction and the curvature change of specimen are closely associated withthe competition between the thermal strain induced by thermal contraction and the volumetric strain caused by martensitetransformation. After DCT, the average thermal and volumetric strains of specimen are respectively about − 0.0051 mm/mm and 0.0049 mm/mm, which are decreased by about 100% and increased by around 25% compared with that of QT,respectively. During QT, the distortion behavior of specimen is governed primarily by the volumetric strain and it mainlyundergoes an expansion deformation. While, during DCT, the distortion behavior of specimen is dominated by the thermalstrain and it primarily encounters a contraction deformation. However, compared with the expansion deformation during QT,the contraction deformation of specimen during DCT is much more significant, which further proves that DCT is feasibleto improve the dimensional stability of specimen.

참고문헌 (Reference)

1 J.R. Cho, 153–154 : 476-481, 2004

2 D. J. Kamody, 154 : 215-218, 1998

3 A. Sugianto, 19 : 194-206, 2010

4 M. Preciado, 176 : 41-44, 2006

5 F. J. Da Silva, 261 : 674-685, 2006

6 V. Leskovsek, 29 : 72-76, 2002

7 H. Li, 662 : 356-362, 2016

8 C. H. Surberg, 48 : 42-47, 2008

9 M. Villa, 65 : 383-392, 2014

10 M. Araghchi, 689 : 48-52, 2017

11 T. Sonar, 20 : 113-118, 2018

12 M. Jung, 60 : 525-536, 2012

13 D.K. Ju, 438–440 : 246-250, 2006

14 A. Sugianto, 209 : 3597-3609, 2009

15 H. H. Bok, 58 : 154-183, 2014

16 D. N. Collins, 23 : 40-42, 1996

17 D. Das, 22 : 474-480, 2007

18 S. Zhirafar, 186 : 298-303, 2007

19 V. G. Gavriljuk, 61 : 1705-1715, 2013

20 S. H. Li, 732 : 167-177, 2018

21 L. C. F. Canale, 24 : 4-52, 2005

22 K. Arimoto, 4 : 168-186, 2009

23 J. W. Li, 47 : 653-666, 2013

24 J. W. Li, 23 : 4237-4250, 2014

25 C. Şimşir, 44 : 588-600, 2008

26 S. J. Lee, 56 : 1482-1490, 2008