scholarly journals Elucidating the Effect of Bimodal Grain Size Distribution on Plasticity and Fracture Behavior of Polycrystalline Materials

2020 ◽  
Vol 11 (04) ◽  
pp. 2050007
Author(s):  
Fabrice Barbe ◽  
Ivano Benedetti ◽  
Vincenzo Gulizzi ◽  
Mathieu Calvat ◽  
Clément Keller
Keyword(s):  
Grain Size ◽  
Stainless Steel ◽  
Tensile Properties ◽  
Fracture Behavior ◽  
316L Stainless Steel ◽  
Scale Model ◽  
Coarse Grain ◽  
Polycrystalline Materials ◽  
Element Modeling ◽  
Bimodal Grain Size

The refinement of grains in a polycrystalline material leads to an increase in strength but as a counterpart to a decrease in elongation to fracture. Different routes are proposed in the literature to try to overpass this strength-ductility dilemma, based on the combination of grains with highly contrasted sizes. In the simplest concept, coarse grains are used to provide relaxation locations for the highly stressed fine grains. In this work, a model bimodal polycrystalline system with a single coarse grain embedded in a matrix of fine grains is considered. Numerical full-field micro-mechanical analyses are performed to characterize the impact of this coarse grain on the stress-strain constitutive behavior of the polycrystal: the effect on plasticity is assessed by means of crystal plasticity finite element modeling [B. Flipon, C. Keller, L. Garcia de la Cruz, E. Hug and F. Barbe, Tensile properties of spark plasma sintered AISI 316L stainless steel with unimodal and bimodal grain size distributions, Mater. Sci. Eng. A 729 (2018) 248–256] while the effect on intergranular fracture behavior is studied by using boundary element modeling [I. Benedetti and V. Gulizzi, A grain-scale model for high-cycle fatigue degradation in polycrystalline materials, Int. J. Fract. 116 (2018) 90–105]. The analysis of the computational results, compared to the experimentally characterized tensile properties of a bimodal 316L stainless steel, suggests that the elasto-plastic interactions taking place prior to micro-cracking may play an important role in the mechanics of fracture of this steel.

Effect of Temperature and Grain Size on the Corrosion Behavior of 316L Stainless Steel in Seawater

2011 ◽  
Vol 299-300 ◽  
pp. 175-178 ◽  
Author(s):  
Sen Sen Xin ◽  
Jian Xu ◽  
Feng Jun Lang ◽  
Mou Cheng Li
Keyword(s):  
Grain Size ◽  
Stainless Steel ◽  
Corrosion Behavior ◽  
316L Stainless Steel ◽  
Seawater Temperature ◽  
Effect Of Temperature ◽  
Coarse Grain ◽  
Pitting Potential ◽  
Fine Grain ◽  
Different Grain Size

The corrosion behavior of 316L stainless steel was investigated in seawater at different temperature by using cyclic anodic polarization. The results indicated that two 316L specimens with different grain size showed similar pitting potential at 25°C. The increase of seawater temperature led to the linear decrease of pitting potential and repassivation potential. Because the pitting resistance of fine grain steel reduced larger than that of coarse grain steel with increasing temperature, the latter had a higher pitting potential about 60 mV at 85°C. Compared with the coarse grain steel, the fine grain steel showed a longer induction time for pitting at 65°C.

BIODUR 316LS

Alloy Digest ◽  
1995 ◽  
Vol 44 (6) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
316L Stainless Steel ◽  
Heat Treating ◽  
Vacuum Arc ◽  
Improve Corrosion Resistance ◽  
Type 316L ◽  
Type 316L Stainless Steel

Abstract BioDur 316LS stainless steel is a modified version of Type 316L stainless steel to improve corrosion resistance for surgical implant applications. The alloy is vacuum arc remelted. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-596. Producer or source: Carpenter.

scholarly journals Contrasting the Role of Pores on the Stress State Dependent Fracture Behavior of Additively Manufactured Low and High Ductility Metals

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3657
Author(s):  
Alexander E. Wilson-Heid ◽  
Erik T. Furton ◽  
Allison M. Beese
Keyword(s):  
Stainless Steel ◽  
Stress State ◽  
Pore Size ◽  
Fracture Behavior ◽  
316L Stainless Steel ◽  
Equivalent Stress ◽  
Failure Behavior ◽  
High Ductility ◽  
State Dependent ◽  
Fracture Models

This study investigates the disparate impact of internal pores on the fracture behavior of two metal alloys fabricated via laser powder bed fusion (L-PBF) additive manufacturing (AM)—316L stainless steel and Ti-6Al-4V. Data from mechanical tests over a range of stress states for dense samples and those with intentionally introduced penny-shaped pores of various diameters were used to contrast the combined impact of pore size and stress state on the fracture behavior of these two materials. The fracture data were used to calibrate and compare multiple fracture models (Mohr-Coulomb, Hosford-Coulomb, and maximum stress criteria), with results compared in equivalent stress (versus stress triaxiality and Lode angle) space, as well as in their conversions to equivalent strain space. For L-PBF 316L, the strain-based fracture models captured the stress state dependent failure behavior up to the largest pore size studied (2400 µm diameter, 16% cross-sectional area of gauge region), while for L-PBF Ti-6Al-4V, the stress-based fracture models better captured the change in failure behavior with pore size up to the largest pore size studied. This difference can be attributed to the relatively high ductility of 316L stainless steel, for which all samples underwent significant plastic deformation prior to failure, contrasted with the relatively low ductility of Ti-6Al-4V, for which, with increasing pore size, the displacement to failure was dominated by elastic deformation.

scholarly journals Size-dependent stochastic tensile properties in additively manufactured 316L stainless steel

2020 ◽  
Vol 32 ◽  
pp. 101090 ◽  
Author(s):  
Ashley M. Roach ◽  
Benjamin C. White ◽  
Anthony Garland ◽  
Bradley H. Jared ◽  
Jay D. Carroll ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Tensile Properties ◽  
316L Stainless Steel ◽  
Size Dependent
Sign in / Sign up

Export Citation Format

Share Document