The present work employs nano-indentation technique to investigate the C partitioning in a medium Mn steel subjected to quenching and tempering process. It is found that the C partitioning between martensite and austenite is inhomogeneous. Particularly, the large lenticular martensite has negligible C partitioning into the austenitic matrix as it maintains an ultra-high nanohardness comparable to the one without tempering. Strategies to suppress the formation of large martensite are discussed.
SpeerJ., MatlockD., De CoomanB. and SchrothJ.: Acta Mater., 2003, 51, (9), 2611–2622. doi: 10.1016/S1359-6454(03)00059-4
3.
ClarkeA. J., SpeerJ. G., MillerM. K., HackenbergR. E., EdmondsD. V., MatlockD. K., RizzoF. C., ClarkeK. D. and De MoorE.: Acta Mater., 2008, 56, (1), 16–22. doi: 10.1016/j.actamat.2007.08.051
4.
MoorE. D., SpeerJ. G., MatlockD. K., KwakJ.-H. and LeeS.-B.: ISIJ Int., 2011, 51, (1), 137–144. doi: 10.2355/isijinternational.51.137
5.
EdmondsD., HeK., RizzoF., De CoomanB., MatlockD. and SpeerJ.: Mater. Sci. Eng., A, 2006, 438–440, 25–34. doi: 10.1016/j.msea.2006.02.133
6.
WangX., ZhongN., RongY., HsuT. and WangL.: J. Mater. Res., 2009, 24, (01), 260–267. doi: 10.1557/JMR.2009.0029
7.
ZhongN., WangX., WangL. and RongY.: Mater. Sci. Eng., A, 2009, 506, (1), 111–116. doi: 10.1016/j.msea.2008.11.014
8.
YiH., ChenP., HouZ., HongN., CaiH., XuY., WuD. and WangG.: Scripta Mater., 2013, 68, (6), 370–374. doi: 10.1016/j.scriptamat.2012.10.018
9.
HeB., LuoH. and HuangM.: Int. J. Plast., 2016, 78, 173–186. doi: 10.1016/j.ijplas.2015.11.004
10.
BaglianiE. P., SantofimiaM., ZhaoL., SietsmaJ. and AnelliE.: Mater. Sci. Eng., A, 2013, 559, 486–495. doi: 10.1016/j.msea.2012.08.130
11.
MolaJ. and De CoomanB. C.: Scr. Mater., 2011, 65, (9), 834–837. doi: 10.1016/j.scriptamat.2011.07.041
12.
SeoE. J., ChoL. and De CoomanB. C.: Metall. Mater. Trans. A, 2015, 46, (1), 27–31. doi: 10.1007/s11661-014-2657-7
13.
ChoL., SeoE. J. and De CoomanB. C.: Scr. Mater., 2016, 123, 69–72. doi: 10.1016/j.scriptamat.2016.06.003
14.
XiongX. C., ChenB., HuangM. X., WangJ. F. and WangL.: Scr. Mater., 2013, 68, (5), 321–324. doi: 10.1016/j.scriptamat.2012.11.003
15.
TsuchiyamaT., TobataJ., TaoT., NakadaN., and TakakiS.: Mater. Sci. Eng., A, 2012, 532, 585–592. doi: 10.1016/j.msea.2011.10.125
16.
HeB. B. and HuangM. X.: Metall. Mater. Trans. A, 2016, 1–8.
HeB. B., HuangM. X., LiangZ. Y., NganA. H. W., LuoH. W., ShiJ., CaoW. Q. and DongH.: Scr. Mater., 2013, 69, (3), 215–218. doi: 10.1016/j.scriptamat.2013.03.030
20.
de Diego-CalderónI., De KnijfD., MonclúsM., Molina-AldareguiaJ., SabirovI., FöjerC., and PetrovR.: Mater. Sci. Eng., A, 2015, 630, 27–35. doi: 10.1016/j.msea.2015.01.077
21.
OliverW. C. and PharrG. M.: J. Mater. Res., 1992, 7, (6), 1564–1583. doi: 10.1557/JMR.1992.1564
22.
GreenwoodG. W. and JohnsonR. H.: Proc. R. Soc. London A, 1965, 283, (1394), 403–422. doi: 10.1098/rspa.1965.0029
23.
LeeS. and De CoomanB. C.: Metall. Mater. Trans. A, 2016, 1–8.
