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

scholarly journals Gradient Microstructure Design in Stainless Steel: A Strategy for Uniting Strength-Ductility Synergy and Corrosion Resistance

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2356
Author(s):  
Qiong He ◽  
Wei Wei ◽  
Ming-Sai Wang ◽  
Feng-Jiao Guo ◽  
Yu Zhai ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
High Strength ◽  
Back Stress ◽  
High Yield ◽  
Surface Mechanical Attrition Treatment ◽  
Steel Sheets ◽  
Mechanical Attrition ◽  
Gradient Microstructure ◽  
Nano Grains

Martensite transformation and grain refinement can make austenitic stainless steel stronger, but this comes at a dramatic loss of both ductility and corrosion resistance. Here we report a novel gradient structure in 301 stainless steel sheets, which enables an unprecedented combination of high strength, improved ductility and good corrosion resistance. After producing inter-layer microstructure gradient by surface mechanical attrition treatment, the sheet was annealed at high temperature for a short duration, during which partial reverse transformation occurred to form recrystallized austenitic nano-grains in the surface layer, i.e., introducing extra intra-layer heterogeneity. Such 3D microstructure heterogeneity activates inter-layer and inter-phase interactions during deformation, thereby producing back stress for high yield strength and hetero-deformation induced (HDI) hardening for high ductility. Importantly, the recrystallized austenitic nano-grains significantly ameliorates the corrosion resistance. These findings suggest an effective route for evading the strength–ductility and strength–corrosion tradeoffs in stainless steels simultaneously.

scholarly journals Microstructural Investigation of Co-Rolled Nanocrystalline Stainless Steel Sheets

2011 ◽  
Vol 702-703 ◽  
pp. 127-130 ◽  
Author(s):  
Delphine Retraint ◽  
M. Zakaria Quadir ◽  
Wan Qiang Xu ◽  
Laurent Waltz ◽  
Michael Ferry
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Composite Structure ◽  
High Strength ◽  
Steel Plates ◽  
Surface Mechanical Attrition Treatment ◽  
Microstructural Investigation ◽  
Steel Sheets ◽  
Mechanical Attrition ◽  
Duplex Process

It is possible to produce a nanocrystalline, multilayered composite structure with enhanced mechanical properties by assembling three 316L surface nanostructured stainless steel plates by roll bonding. The Surface Mechanical Attrition Treatment (SMAT) was first used to generate nanocrystalline layers on the elementary plates so that their mechanical properties were improved. They were then assembled through co-rolling. A composite structure of nanocrystalline layers of high strength alternating with more ductile layers was obtained to achieve both high strength and ductility. Microscopy observations and EBSD measurements were carried out and the bonding interfaces were analysed in detail to explore the mechanisms involved during the SMAT/Co-rolling duplex process.

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 Microstructure Evolution and Mechanical Properties of Austenite Stainless Steel with Gradient Twinned Structure by Surface Mechanical Attrition Treatment

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1624
Author(s):  
Aiying Chen ◽  
Chen Wang ◽  
Jungan Jiang ◽  
Haihui Ruan ◽  
Jian Lu
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Stainless Steel ◽  
Stainless Steels ◽  
Surface Mechanical Attrition Treatment ◽  
Spatial Distributions ◽  
Gradient Structure ◽  
Mechanical Attrition ◽  
Gradient Microstructure ◽  
Strength And Plasticity

Gradient structures in engineering materials produce an impressive synergy of strength and plasticity, thereafter, have recently attracted extensive attention in the material families. Gradient structured stainless steels (SS) were prepared by surface mechanical attrition treatment (SMAT) with different impacting velocities. The microstructures of the treated samples are characterized by gradient twin fraction and phase constituents. Quantitative relations of gradient microstructure with impacting time and mechanical properties are analyzed according to the observations of SEM, TEM, XRD, and tests of mechanical property. The processed SSs exhibited to be simultaneously stiff, strong, and ductile, which can be attributed to the co-operation of the different spatial distributions of multi-scaled structures. The formation of gradient twinned structure is resolved and the strengthening by gradient structure is explored.

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.

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