Generation of Nanostructures on 316L Stainless Steel and Its Effect on Mechanical Behavior

2005 ◽  
Vol 490-491 ◽  
pp. 625-630 ◽  
Author(s):  
T. Roland ◽  
Delphine Retraint ◽  
K. Lu ◽  
Jian Lu
Keyword(s):  
Residual Stress ◽  
Mechanical Behavior ◽  
316L Stainless Steel ◽  
Mechanical Response ◽  
High Strength ◽  
Nanostructured Material ◽  
Surface Mechanical Attrition Treatment ◽  
Metallic Materials ◽  
Mechanical Attrition ◽  
Compressive Residual Stresses

Improved mechanical behavior of surface nanostructured metallic materials produced by means of a surface mechanical attrition treatment (S.M.A.T) is investigated experimentally. Based on microscopic observations and residual stress measurements, factors leading to the high strength and yielding are discussed. The effects due to treatment, as compressive residual stresses, are in that way studied for a better understanding of their influence on the global mechanical response of the nanostructured material. In regards of this, a simple way to increase the ductility of such a nanostructured material is also presented.

scholarly journals In Situ Formation of Carbon Nanomaterials on Bulk Metallic Materials

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
J. Y. Xu ◽  
X. C. Lei ◽  
R. Yang ◽  
Z. Z. Fan
Keyword(s):  
Stainless Steel ◽  
316L Stainless Steel ◽  
Carbon Nanomaterials ◽  
Pure Nickel ◽  
Surface Mechanical Attrition Treatment ◽  
Metallic Materials ◽  
Pure Cobalt ◽  
Mechanical Attrition ◽  
In Situ Formation

Carbon nanomaterials were synthesized in situ on bulk 316L stainless steel, pure cobalt, and pure nickel by hybrid surface mechanical attrition treatment (SMAT). The microstructures of the treated samples and the resulted carbon nanomaterials were investigated by SEM and TEM characterizations. Different substrates resulted in different morphologies of products. The diameter of carbon nanomaterials is related to the size of the nanograins on the surface layer of substrates. The possible growth mechanism was discussed. Effects of the main parameters of the synthesis, including the carbon source and gas reactant composition, hydrogen, and the reaction temperature, were studied. Using hybrid SMAT is proved to be an effective way to synthesize carbon nanomaterials in situ on surfaces of metallic materials.

Ultrasonic Evaluation of Compressive Residual Stress of Surface Treated Metals

2005 ◽  
Vol 490-491 ◽  
pp. 184-189 ◽  
Author(s):  
Farid Belahcene ◽  
Xiaolai Zhou ◽  
Jian Lu
Keyword(s):  
Experimental Data ◽  
Residual Stresses ◽  
Nondestructive Evaluation ◽  
Subsurface Layer ◽  
Surface Mechanical Attrition Treatment ◽  
Shallow Subsurface ◽  
Ultrasonic Evaluation ◽  
Mechanical Attrition ◽  
Machine Parts ◽  
Compressive Residual Stresses

Shot peening is an effective method of improving fatigue performance of machine parts in the industry by producing a thin surface layer of compressive residual stresses that prevents crack initiation and retards crack growth during service. Nondestructive evaluation of the prevailing compressive residual stresses in the shallow subsurface layer is realized by the critically refracted longitudinal (Lcr) waves. This paper presents experimental data obtained on SMAT (surface mechanical attrition treatment) steel alloy S355 sample. Comparative travel-time shows that there are statistically significant differences in treated and untreated specimen. With knowledge of the acoustoelastic constants which are obtained by a test calibration, the experimental data indicates that compressive residual stresses are distributed near subsurface (hundreds of micron). These stress results show that the Lcr technique is efficient for evaluation of residual stresses after the surface treatment.

scholarly journals A numerical investigation on the effects of porosity on the plastic anisotropy of additive manufactured stainless steel with various crystallographic textures

2021 ◽  
Author(s):  
Jiaojiao Wu ◽  
Wenqi Liu ◽  
Napat Vajragupta ◽  
Alexander Hartmaier ◽  
Junhe Lian
Keyword(s):  
Stainless Steel ◽  
Numerical Investigation ◽  
316L Stainless Steel ◽  
Mechanical Response ◽  
Plastic Anisotropy ◽  
High Strength ◽  
Anisotropic Plasticity ◽  
Deformation And Failure ◽  
Mechanical Responses ◽  
Microstructure Model

For additive manufacturing materials, different process parameters might cause non-negligible microstructural defects. Due to the deficient or surplus energy input during the process, porosity would result in significantly different mechanical responses. In addition, the heterogeneity of the microstructure of additive manufactured material could increase the anisotropic behavior in both deformation and failure stages. The aim of this study is to perform a numerical investigation of the anisotropic plasticity affected by the microstructural features, in particular, texture and porosity. The coupling of the synthetic microstructure model and the crystal plasticity method is employed to consider the microstructural features and to predict the mechanical response at the macroscopic level, including both flow curve and r-value evolution. The additive manufactured 316L stainless steel is chosen as the reference steel in this study. Porosity decreases the stress of material, however, it reduces the anisotropy of material with both two types of textures. Regardless of porosity, grains with <111>//BD fiber of reference material is preferable for high strength requirement while the random orientations are favorable for homogeneous deformation in applications.

High-strength GWZ1031K alloy with gradient structure induced by surface mechanical attrition treatment

2020 ◽  
Vol 170 ◽  
pp. 110701
Author(s):  
Xiaoyu Xue ◽  
Yujuan Wu ◽  
Ning Su ◽  
Xiangwen Heng ◽  
Qingchen Deng ◽  
...  
Keyword(s):  
High Strength ◽  
Surface Mechanical Attrition Treatment ◽  
Gradient Structure ◽  
Mechanical Attrition

Influence of Surface Mechanical Attrition Treatment on the oxidation behaviour of 316L stainless steel

2018 ◽  
Vol 136 ◽  
pp. 188-200 ◽  
Author(s):  
S. Benafia ◽  
D. Retraint ◽  
S. Yapi Brou ◽  
B. Panicaud ◽  
J.L. Grosseau Poussard
Keyword(s):  
Stainless Steel ◽  
316L Stainless Steel ◽  
Oxidation Behaviour ◽  
Surface Mechanical Attrition Treatment ◽  
Mechanical Attrition

Mechanical Properties of 316L Stainless Steel with Nanostructure Surface Layer Induced by Surface Mechanical Attrition Treatment

2007 ◽  
Vol 353-358 ◽  
pp. 1810-1813 ◽  
Author(s):  
Xiao Hua Yang ◽  
Wei Zhen Dui ◽  
Gang Liu
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Wear Resistance ◽  
Surface Layer ◽  
316L Stainless Steel ◽  
Hardened Layer ◽  
Surface Mechanical Attrition Treatment ◽  
Mechanical Attrition ◽  
Nanostructure Surface ◽  
Nanocrystalline Layer

The mechanical properties of the 316L stainless steel subjected to surface mechanical attrition treatment (SMAT) have been studied, these properties are hardness, tensile properties and wear resistance. The research shows that the thickness of the hardened layer increases with the increasing of the treating time. The refined microstructure in the treated layer led to increasing in hardness, strength, and wear resistance. It is obvious that the surface layer hardness and bulk yield strength are increasing when the SMAT time reaches 5 minutes. The increase of surface layer wear resistance is obvious when the SMAT time is 15 minutes. The SEM observation of the wear scars shows that the nanocrystalline layer might reduce the effect of adhesive wear of 316L stainless steel. Therefore, the wear mechanism changes from adhesive abrasion to grinding particle abrasion after SMAT.

Study of the Tensile Strength of Nanostructured Copper Obtained by Electrodeposition and SMAT

2007 ◽  
Author(s):  
H. L. Chan ◽  
J. Lu
Keyword(s):  
Grain Size ◽  
Tensile Strength ◽  
Yield Strength ◽  
Nanostructured Material ◽  
Experimental Results ◽  
Surface Mechanical Attrition Treatment ◽  
Engineering Applications ◽  
Mechanical Attrition ◽  
Nanostructured Copper

The tensile strength of nanostructured Cu obtained by electrodeposition and Surface Mechanical Attrition Treatment (SMAT) was studied. Cu after electrodeposition had been first studied. Electrodeposited Cu had the well-known reduction on the grain size and as well as the improvement on the strength compared with the bulk hard copper. After SMAT, although the ductility had dropped, the yield strength is further enhanced up to 50% (350MPa) to obtain a stronger material. Since the parameters of the electrodeposition affects the properties of the materials obtained, rooms for improvement could be expected, for example, increasing the duration of the electrodeposition may increase the ductility significantly, in the later stage of this study, experimental results proved this saying. The present study demonstrates the potential process for developing a novel surface nanostructured material with electrodeposited Copper with SMAT for engineering applications.

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