scholarly journals Insight to the Influence of Ti Addition on the Strain-Induced Martensitic Transformation in a High (about 7 wt.%) Mn Stainless Steel

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 568
Author(s):  
Saeed Sadeghpour ◽  
Vahid Javaheri ◽  
Ahmad Kermanpur ◽  
Jukka Kömi
Keyword(s):  
Stainless Steel ◽  
Cold Rolling ◽  
Volume Fraction ◽  
Close Correlation ◽  
Rolling Process ◽  
Dislocation Cell ◽  
Rolling Pass ◽  
Strain Induced Martensite ◽  
Steel Grades ◽  
Kinetics Of

The kinetics of strain-induced martensite (SIM) formation in a Ti-bearing 201L stainless steel were evaluated and compared to the existing results of two conventional stainless steel grades; i.e., 201L and 304L AISI. The effects of strain rate and rolling pass reduction on the kinetics of SIM formation during cold rolling were investigated. The Ti-microalloying was found to be intensifying the transformation due to lowering the stacking fault energy. It was seen that decreasing the rolling pass reduction strongly affected the variation of SIM volume fraction. Furthermore, a close correlation between the hardness and strain-induced transformation was found arising from microstructural evolution during the cold rolling process. Three stages in the hardening behavior were detected associated with lath-type martensite formation, transition stage of martensite laths break up and formation of dislocation-cell-type martensite.

Numerical Simulation and Parameter Design of Strip Cold Rolling Process of 301L Stainless Steel in 20-Roll Mill

2020 ◽  
Vol 51 (4) ◽  
pp. 1370-1383
Author(s):  
Junchen Li ◽  
Xutao Huang ◽  
Guocai Ma ◽  
Junwei Wang ◽  
Jixiang Pan ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Stainless Steel ◽  
Cold Rolling ◽  
Rolling Process ◽  
Parameter Design ◽  
Roll Mill

Effect of Pre-Shot Peening on Plasma Nitriding Kinetics of Austenitic Stainless Steel

2013 ◽  
Vol 634-638 ◽  
pp. 2955-2959 ◽  
Author(s):  
Lie Shen ◽  
Liang Wang ◽  
Jiu Jun Xu ◽  
Ying Chun Shan
Keyword(s):  
Stainless Steel ◽  
Surface Layer ◽  
Austenitic Stainless Steel ◽  
Shot Peening ◽  
Plasma Nitriding ◽  
Nitrogen Diffusion ◽  
X Ray Diffraction ◽  
304 Austenitic Stainless Steel ◽  
Strain Induced Martensite ◽  
Kinetics Of

The fine grains and strain-induced martensite were fabricated in the surface layer of AISI 304 austenitic stainless steel by shot peening treatment. The shot peening effects on the microstructure evolution and nitrogen diffusion kinetics in the plasma nitriding process were investigated by optical microscopy and X-ray diffraction. The results indicated that when nitriding treatments carried out at 450°C for times ranging from 0 to 36h, the strain-induced martensite transformed to supersaturated nitrogen solid solution (expanded austenite), and slip bands and grain boundaries induced by shot peening in the surface layer lowered the activation energy for nitrogen diffusion and evidently enhanced the nitriding efficiency of austenitic stainless steel.

scholarly journals Effect of Manganese on the Structure-Properties Relationship of Cold Rolled AHSS Treated by a Quenching and Partitioning Process

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1122 ◽  
Author(s):  
Simone Kaar ◽  
Daniel Krizan ◽  
Reinhold Schneider ◽  
Coline Béal ◽  
Christof Sommitsch
Keyword(s):  
Mechanical Properties ◽  
Volume Fraction ◽  
Bainitic Ferrite ◽  
Total Elongation ◽  
Process Window ◽  
Quenching And Partitioning ◽  
Strain Behavior ◽  
Strain Induced Martensite ◽  
Steel Grades ◽  
Mn Content

The present work focuses on the investigation of both microstructure and resulting mechanical properties of different lean medium Mn Quenching and Partitioning (Q&P) steels with 0.2 wt.% C, 1.5 wt.% Si, and 3–4 wt.% Mn. By means of dilatometry, a significant influence of the Mn-content on their transformation behavior was observed. Light optical and scanning electron microscopy (LOM, SEM) was used to characterize the microstructure consisting of tempered martensite (α’’), retained austenite (RA), partially bainitic ferrite (αB), and final martensite (α’final) formed during final cooling to room temperature (RT). Using the saturation magnetization measurements (SMM), a beneficial impact of the increasing Mn-content on the volume fraction of RA could be found. This remarkably determined the mechanical properties of the investigated steels, since the larger amount of RA with its lower chemical stabilization against the strain-induced martensite transformation (SIMT) highly influenced their overall stress-strain behavior. With increasing Mn-content the ultimate tensile strength (UTS) rose without considerable deterioration in total elongation (TE), leading to an enhanced combination of strength and ductility with UTS × TE exceeding 22,500 MPa%. However, for the steel grades containing an elevated Mn-content, a narrower process window was observed due to the tendency to form α’final.

Effect of Cold Rolling Process on the Microstructure and Corrosion Behaviors of 316L Stainless Steel in Simulated Body Fluids

2014 ◽  
Vol 548-549 ◽  
pp. 310-315
Author(s):  
W.M.F.W. Mohamad ◽  
M.Z. Selamat ◽  
B. Bundjali ◽  
M. Musa
Keyword(s):  
Stainless Steel ◽  
Cold Rolling ◽  
316L Stainless Steel ◽  
Rolling Process ◽  
Optical Microscope ◽  
Body Fluids ◽  
Breakdown Potential ◽  
Corrosion Behaviors ◽  
Cold Rolled ◽  
Simulated Body Fluids

This present paper is aims to study the influence of cold rolling process on the microstructure and corrosion behaviors of 316L stainless steel using potentiodynamics polarization testing techniques. The steel with initial thickness of 2.0 mm was unidirectional cold rolled to 10%, 30% and 50% reduction in thickness. The corrosion behaviors of the cold rolled steels were evaluated in phosphate buffered saline (PBS) as their simulated body fluids environment. The pH and temperature of the solution was maintained at 7.31 and 37°C and took approximately 5 hours for each individual test. The microstructure observations of the steels were studied using optical microscope and scanning electron microscopy (SEM). The results showed that the cold rolling process has modified the microstructure of 316L stainless steel by producing extensive surface defects. The microstructure modifications of the cold-rolled steel caused to enhance the corrosion resistance by lowering its corrosion rate to 23% and reduce the pitting resistance by lowering its breakdown potential to 61%. The pit corrosion was extensively appeared after reaching the breakdown potential.

Investigation of cold rolling variables on the formation of strain-induced martensite in 201L stainless steel

2013 ◽  
Vol 46 ◽  
pp. 49-53 ◽  
Author(s):  
A. Rezaee ◽  
A. Kermanpur ◽  
A. Najafizadeh ◽  
M. Moallemi ◽  
H. Samaei Baghbadorani
Keyword(s):  
Stainless Steel ◽  
Cold Rolling ◽  
Strain Induced Martensite

Thermal Scratch on Surface of SUS430 Stainless Steel Strip in Cold Rolling Process

2014 ◽  
Vol 21 (3) ◽  
pp. 282-286 ◽  
Author(s):  
Chang-sheng Li ◽  
Jin-shan Chen ◽  
Wen-long Han ◽  
You-yuan Li ◽  
Bo Fu
Keyword(s):  
Stainless Steel ◽  
Cold Rolling ◽  
Steel Strip ◽  
Rolling Process ◽  
Thermal Scratch
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