scholarly journals Surface Grain Refinement of 304L Stainless Steel by Combined Severe Shot Peening and Reversion Annealing Treatment

Coatings ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 470 ◽  
Author(s):  
Xuanpei Wu ◽  
Zeyou Qi ◽  
Zhiling Zhou ◽  
Hongcheng Zhang ◽  
Weijie Wu ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Grain Refinement ◽  
Shot Peening ◽  
Annealing Treatment ◽  
304L Stainless Steel ◽  
H2so4 Solution ◽  
Combined Method ◽  
Surface Layers ◽  
Novel Method ◽  
Severe Shot Peening

The present study proposes a novel method, i.e., combined severe shot peening (SP) and reversion annealing treatment, to grain-refine the surface layers of 304L austenitic stainless steel. Steel specimens were shot-peened at 0.7 MPa for 30 min, introducing 40% vol. α′ martensite, and then were annealed at 700 or 800 °C for different durations (30 s). As annealing reversed α′ martensite to austenite, the obtained surface layers consist of fully austenitic ultrafine grains. The smallest grain size obtained is about 500 nm at the top surface. SP elevates the microhardness to more than 500 HV. Although the grain-refined surface layers produced by the combined method are not as hard as that treated by only SP, they are harder (e.g., the specimen annealed at 700 °C for 30 s using a heating rate of 50 °C/s exhibited a peak microhardness of 400 HV) than the untreated surface layer (225 HV) due to grain refinement. Moreover, due to the absence of α′ martensite, they have higher corrosion resistance in H2SO4 solution than that treated by only SP.

Nanoscale surface modification of AISI 316L stainless steel by severe shot peening

2016 ◽  
Vol 102 ◽  
pp. 68-77 ◽  
Author(s):  
Sara Bagherifard ◽  
Sebastian Slawik ◽  
Inés Fernández-Pariente ◽  
Christoph Pauly ◽  
Frank Mücklich ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Surface Modification ◽  
Shot Peening ◽  
316L Stainless Steel ◽  
Aisi 316L ◽  
Aisi 316L Stainless Steel ◽  
Severe Shot Peening

XRD and EBSD studies of severe shot peening induced martensite transformation and grain refinements in austenitic stainless steel

2020 ◽  
Vol 168 ◽  
pp. 110574 ◽  
Author(s):  
Hongfei Liu ◽  
Yuefan Wei ◽  
Chee Kiang Ivan Tan ◽  
Dennise T. Ardi ◽  
Dennis C.C. Tan ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Shot Peening ◽  
Martensite Transformation ◽  
Severe Shot Peening

CHARACTERIZATION OF FRICTION WELDED TITANIUM ALLOY AND STAINLESS STEEL WITH A NOVEL INTERLAYER GEOMETRY

2016 ◽  
Vol 24 (05) ◽  
pp. 1750064
Author(s):  
R. KUMAR ◽  
M. BALASUBRAMANIAN
Keyword(s):  
Stainless Steel ◽  
Research Work ◽  
Metal Loss ◽  
304L Stainless Steel ◽  
Surface Geometry ◽  
Optical Micrograph ◽  
Minimum Number ◽  
Novel Method ◽  
Non Destructive

The main purpose of the current research work is to identify and investigate a novel method of holding an intermediate metal and to evaluate its metallurgical and mechanical properties. Copper was used as an interlayer material for the welding of this dissimilar Ti–6Al–4V (Ti alloy) and 304L stainless steel (SS). The study shows that the input parameters and surface geometry played a very significant role in producing a good quality joints with minimum heat affected zone and metal loss. A sound weld was achieved between Ti–6Al–4V and SS304L, on the basis of the earlier experiments conducted by the authors in their laboratory, by using copper rod as intermediate metal. Box–Behnken method was used for performing a minimum number of experiments for the study. In the present study, Ti–6Al–4V alloy and SS304L were joined by a novel method of holding the interlayer and new surface geometry for the interlayer. Initially, the drop test was used for determining the quality of the fabricated joint and, subsequently, non-destructive techniques like radiography and C-scan were used. Further optical micrograph, SEM–EDS, hardness and tensile test were done for understanding the performance of the joint.

Two-step annealing treatment for grain refinement of cold-worked AISI 316L stainless steel

2020 ◽  
Vol 111 (8) ◽  
pp. 676-680
Author(s):  
Hamed Mirzadeh ◽  
Kamyar Sharifian ◽  
Sara Kheiri ◽  
Meysam Naghizadeh
Keyword(s):  
Stainless Steel ◽  
Grain Refinement ◽  
Retained Austenite ◽  
Mechanical Response ◽  
Annealing Treatment ◽  
Primary Recrystallization ◽  
Annealing Process ◽  
Aisi 316L ◽  
316L Austenitic Stainless Steel ◽  
Cold Worked

Abstract Two-step annealing after cold rolling is proposed for the optimization of the annealing process of AISI 316L austenitic stainless steel toward more intense grain refinement. It was revealed that the first step of the annealing process at lower temperatures (i. e. 750 0C) can be used for the reversion of strain-induced martensite to austenite without uninhibited grain growth and recrystallization of the retained austenite. Afterwards, the primary recrystallization of the retained austenite takes place in the second step of the annealing process at higher temperatures (in the range of 850 to 950 0C). Carefully controlling the second annealing step resulted in a finer grain size and better mechanical response compared to those of a conventional one-step annealing approach.

scholarly journals Study of the effect of Accumulative Angular Drawing deformation route on grain refinement in 304L stainless steel

2020 ◽  
Vol 50 ◽  
pp. 350-354
Author(s):  
Maciej Szymula ◽  
Krzysztof Muszka ◽  
Janusz Majta ◽  
Marek Paćko ◽  
Jerzy Dybich
Keyword(s):  
Stainless Steel ◽  
Grain Refinement ◽  
304L Stainless Steel

scholarly journals Characterization of Surface Modification of 347 Stainless Steel upon Shot Peening

Scanning ◽  
2017 ◽  
Vol 2017 ◽  
pp. 1-4 ◽  
Author(s):  
Kejian Li ◽  
Qiang Zheng ◽  
Chunhong Li ◽  
Bin Shao ◽  
Donglin Guo ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Stainless Steel ◽  
Phase Transformation ◽  
Grain Refinement ◽  
Shot Peening ◽  
Exact Expression ◽  
Electron Backscattered Diffraction ◽  
Transmission Electron ◽  
Ultrasonic Shot Peening ◽  
Two Phases

Plastic deformations, such as those obtained by shot peening on specimen surface, are an efficient way to improve the mechanical behavior of metals. Generally, scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD) are commonly used to observe the complex microstructural evolutions, such as grain refinement and phase transformation, induced by the surface treatment. In this work, the microstructure of 347 stainless steel, after ultrasonic shot peening (USP) treatments, was investigated. SEM, EBSD, transmission electron microscopy, and X-ray diffraction were used to observe the microstructural evolutions, such as grain refinement and phase transformation. Deformation depth after the USP treatment was about 200 μm. Grain size on the treated surface layer was about 100 nm, with two phases: austenite and α′-martensite. The percentages of the austenite and α′-martensite phases were 54% and 46%, respectively, which constitute an exact expression of the degree of plastic deformation on austenitic stainless steel.

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