Samples of 316L austenitic stainless steel with bimodal grain size distributions are elaborated using two distinct routes. The first one is based on powder metallurgy using spark plasma sintering of two powders with different particle sizes. The second route applies the reverse-annealing method: it consists in inducing martensitic phase transformation by plastic strain and further annealing in order to obtain two austenitic grain populations with different sizes. Microstructural analy ses reveal that both methods are suitable to generate significative grain size contrast and to control this contrast according to the elaboration conditions. Mechanical properties under tension are then characterized for different grain size distributions. Crystal plasticity finite element modelling is further applied in a configuration of bimodal distribution to analyse the role played by coarse grains within a matrix of fine grains, considering not only their volume fraction but also their spatial arrangement.

1.
H.
Gleiter
,
Prog. Mater. Sci.
33
,
223
315
,
1989
.
2.
M.A.
Meyers
,
A.
Mishra
and
D.J.
Benson
,
Progr. Mater. Sci.
51
,
427
556
,
2006
.
3.
A.
Pineau
,
A.A.
Benzerga
,
T.
Pardoen
,
Acta Mater.
107
,
508
544
,
2016
.
4.
L.
Lu
,
Y.
Shen
,
X.
Chen
,
L.
Qian
,
K.
Lu
,
Science
304
,
422
426
,
2004
.
5.
S.
Sabooni
,
F.
Karimzadeh
,
M.H.
Enayati
,
A.H.W.
Ngan
,
Mater. Sci. Engng A
636
,
221
230
,
2015
.
6.
Z.
Zhang
,
D.
Orlov
,
S. K.
Vajpai
,
B.
Tong
,
K.
Ameyama
,
Adv. Engng Mater.
17
,
791
795
,
2015
.
7.
C.
Keller
,
K.
Tabalaiev
,
G.
Marnier
,
J.
Noudem
,
X.
Sauvage
,
E.
Hug
,
Mater. Sci. Engng A
665
,
125
134
,
2016
.
8.
G.
Marnier
,
C.
Keller
,
J.
Noudem
,
E.
Hug
,
Mater. Design
63
,
633
640
,
2014
.
9.
R.
Quey
,
P.R.
Dawson
,
F.
Barbe
,
Comput. Meth. Appl. Mech. Engng.
200
,
1729
1745
,
2011
.
10.
L.
Meric
,
G.
Cailletaud
,
J. Engng. Mater. Technol.
113
,
171
182
,
1991
.
11.
F.
Barbe
,
R.
Quey
,
Int. J. Plasticity
27
,
823
840
,
2011
.
12.
B.
Flipon
,
F.
Barbe
,
C.
Keller
,
R.
Quey
,
Eur. Mech. Mater. Conf.
15
, Brussels, 7-9 September
2016
.
13.
B. R.
Kumar
,
S.
Sharma
,
B. P.
Kashyap
,
N.
Prabhu
,
Mater. Design
68
,
63
71
,
2015
.
14.
F.
Forouzan
,
A.
Najafizadeh
,
A.
Kermanpur
,
A.
Hedayati
,
R.
Surkialiabad
,
Mater. Sci. Engng A
527
,
7334
7339
,
2010
.
This content is only available via PDF.
You do not currently have access to this content.