On the Reversion and Recrystallization of Austenite in the Interstitially Alloyed Ni-Free Nano/Ultrafi ne Grained Austenitic Stainless Steels

다국어 초록 (Multilingual Abstract)

The martensite reversion treatment was conducted on two grades of Ni-free austenitic stainless steels interstitially alloyed withC and N. The hot rolled sheets of steels were cold rolled up to 80% thickness reduction to acquire strain-induced α′-martensiteand subsequently reversion annealed at temperatures from 700 to 850 °C for 1 to 1000 s to revert the α′-martensite to austenite.
Microstructural evolution was investigated using optical microscopy, X-ray diff raction, electron backscatter diff raction,and magnetic measurement techniques. Mechanical properties were measured using tensile tests at room temperature.
The resultant microstructures contained both reverted and recrystallized austenite when reverted at 700 and 750 °C withthe annealing time less than 100 s. A nonuniform grain structure was characterized under these conditions consisting ofnano/ultrafi ne grains formed via α′-martensite reversion and coarser grains by recrystallization of the retained austenite.
However, a more uniform austenite grain size with average size of 1 μm was obtained at 850 °C for 1000 s. The specimenshaving nonuniform grain structure exhibited excellent combinations of strength and ductility. A variety of mechanical propertieswas achieved depending on the annealing condition. The work hardening behavior aff ected UTS and ductility of thestudied steels. The shift of the work hardening peaks to the higher strains was found suitable for ductility. Addition of C toN-containing Ni-free steels deteriorated mechanical properties. Best combination of strength and elongation was obtainedin the test material with lower C/N ratio.

참고문헌 (Reference)

1 K.H. Lo, 65 (65): 39-104, 2009

2 A. F. Padilha, 43 (43): 135-143, 2003

3 M. Talha, 33 (33): 3563-3575, 2013

4 D. Leem, 45 : 767-772, 2001

5 Y. Lee, 19 : 393-399, 2003

6 K. Tomimura, 31 (31): 1431-1437, 1991

7 M. C. Somani, 40 (40): 729-744, 2009

8 V. S. A. Challa, 649 : 153-157, 2016

9 P. Behjati, 592 : 77-82, 2014

10 M. Eskandari, 63 (63): 1442-1444, 2009

11 R. D. K. Misra, 41 (41): 2162-2174, 2010

12 S. Rajasekhara, 527 (527): 1986-1996, 2010

13 S. Srikanth, 2 (2): 203-213, 2013

14 A. Di Schino, 37 (37): 4561-4565, 2002

15 F. Forouzan, 05 : 383-390, 2012

16 M. Eskandari, 519 (519): 46-50, 2009

17 M. Moallemi, 530 (530): 378-381, 2011

18 H. Samaei Baghbadorani, 636 : 593-599, 2015

19 A. Rezaee, 528 (528): 5025-5029, 2011

20 M. Sumita, 24 (24): 753-760, 2004

21 R. P. Reed, 41 (41): 16-21, 1989

22 P. J. Uggowitzer, 36 (36): 901-908, 1996

23 M. O. Speidel, 37 (37): 875-880, 2006

24 F. B. Pickering, 21 : 42-, 1976

25 J. Rawers, 207 (207): 188-194, 1996

26 Z. Yuan, 475 (475): 202-206, 2008

27 G. Balachandran, 41 (41): 1018-1027, 2001

28 V.G. Gavriljuk, 481–482 (481–482): 707-712, 2008

29 H. Berns, 78 (78): 714-719, 2007

30 V. G. Gavriljuk, 78 (78): 720-723, 2007

31 B. D. Shanina, 78 (78): 724-728, 2007

32 T. -H. Lee, 43 (43): 4455-4459, 2012

33 H. -Y. Ha, 80 : 488-492, 2009

34 J. Kang, 610 : 427-435, 2014

35 H. Feichtinger, 318–320 : 261-270, 1999

36 Y. Murata, 33 (33): 711-720, 1993

37 Y. Hosoi, 179–181 (179–181): 143-147, 1991

38 Y. Hosoi, 191–194 : 686-690, 1992

39 K. Miyahara, 212 : 766-771, 1994

40 L. Mújica Roncery, 59 (59): 6275-6286, 2011

41 V. G. Gavriljuk, 36 (36): 738-745, 1996

42 Q.X. Dai, 385 (385): 445-448, 2004

43 J. Talonen, 36 : 421-432, 2005

44 T. Masumura, 84 : 330-338, 2015

45 Y. Matsuoka, 53 (53): 1224-1230, 2013

46 D. P. Escobar, 4 (4): 162-170, 2015

47 S. Sadeghpour, 584 : 177-183, 2013

48 V. G. Gavriljuk, 48 (48): 3879-3893, 2000

49 A. Kisko, 578 : 408-416, 2013

50 P. Behjati, 63 : 500-507, 2014

51 R. E. Schramm, 6 (6): 1345-1351, 1975

52 P.J. Brofman, 9A : 879-880, 1978

53 R. P. Reed, 23 : 1359-1362, 1989

54 B. Ravi Kumar, 45 (45): 6027-6038, 2014

55 L. F. M. Martins, 38 (38): 572-579, 1998

56 L. Kaufman, 11 (11): 323-335, 1963

57 H. Berns, "High Interstitial Stainless Austenitic Steels" Springer 2013

58 J. Black, "Handbook of Biomaterials Properties" Chapman & Hall 1998

59 "ASTM E8-00, Standard Method for Tension Testing of Metallic Materials"