scholarly journals Analysis of the influence of the anisotropy induced by cold rolling on duplex and super-austenitic stainless steels

2010 ◽  
Vol 4 (13) ◽  
pp. 24-30 ◽  
Author(s):  
Angelo Finelli ◽  
Martino Labanti
Keyword(s):  
Cold Rolling ◽  
Stainless Steels ◽  
Austenitic Stainless Steels

Regularities of Microstructure Evolution and Strengthening Mechanisms of Austenitic Stainless Steels Subjected to Large Strain Cold Working

2016 ◽  
Vol 879 ◽  
pp. 224-229 ◽  
Author(s):  
Andrey Belyakov ◽  
Marina Odnobokova ◽  
Iaroslava Shakhova ◽  
Rustam Kaibyshev
Keyword(s):  
Martensitic Transformation ◽  
Yield Strength ◽  
Cold Rolling ◽  
Stainless Steels ◽  
Cold Working ◽  
Large Strain ◽  
Austenitic Stainless Steels ◽  
Nanocrystalline Structures ◽  
Stable Austenite ◽  
Dislocation Strengthening

The deformation microstructures and their effects on mechanical properties of austenitic stainless steels processed by cold rolling at ambient temperature to various total strains were studied. The cold working was accompanied by the development of strain-induced martensitic transformation because of meta-stable austenite at room temperature. The strain-induced martensitic transformation and deformation twinning promoted the grain refinement during cold rolling, leading to nanocrystalline structures consisting of a mixture of austenite and martensite grains with their transverse grain sizes of 50-150 nm containing high dislocation densities. The rolled samples experienced substantial strengthening resulted from high density of strain induced grain/phase boundaries and dislocations. The yield strength of austenitic stainless steels could be increased to 2000 MPa after rolling to total strains of about 4. The martensite and austenite provided almost the same contribution to overall yield strength. The dislocation strengthening was much higher than the grain boundary strengthening at small to moderate strains of about 2, whereas the latter gradually increased approaching the level of dislocation strengthening with increasing the strain.

Application of Thermo-Mechanical Process to Achieve Nanostructure in 301 Austenitic Stainless Steels

2011 ◽  
Vol 312-315 ◽  
pp. 51-55
Author(s):  
A. Shokohfar ◽  
S. M. Abbasi ◽  
Ali Yazdani ◽  
Behnam Rabiee
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Cold Rolling ◽  
Tensile Properties ◽  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Mechanical Process ◽  
Cold Rolling And Annealing ◽  
Cold Rolled ◽  
Austenite Grains

In this study, cold rolling and annealing are used to refine the austenite grains of 301 austenitic stainless steel. The 301 austenitic stainless steel was cold rolled for 70 and 90% strain and then annealed. Effects of cold rolling factors and temperatures and annealing times on microstructure, hardness and tensile properties have been studied.

Processing of Submicron Grained Microstructures and Enhanced Mechanical Properties by Cold-Rolling and Reversion Annealing of Metastable Austenitic Stainless Steels

2007 ◽  
Vol 539-543 ◽  
pp. 4875-4880 ◽  
Author(s):  
Mahesh C. Somani ◽  
L. Pentti Karjalainen ◽  
Antero Kyröläinen ◽  
Tero Taulavuori
Keyword(s):  
Mechanical Properties ◽  
Cold Rolling ◽  
Stainless Steels ◽  
Magnetic Measurements ◽  
Austenitic Stainless Steels ◽  
Tensile Tests ◽  
X Ray Diffraction ◽  
Strain Induced Martensite ◽  
Austenite Grains ◽  
Nucleation And Growth Mechanism

The effects of chemical composition, cold rolling and subsequent annealing parameters on the reversion of strain-induced martensite to austenite were investigated in three experimental Mn and Si-free Cr-Ni austenitic stainless steels and two commercial Type 301 and Type 301LN grades by optical and electron microscopy, X-ray diffraction and magnetic measurements. Hardness and tensile tests were performed to determine the mechanical properties achieved. In cold rolling, completely martensitic structure could be obtained in the experimental heats, but only partially in 301 and 301LN grades at reasonable reductions. Upon annealing, in 301LN the reversion took place by the nucleation and growth mechanism, and submicron austenite grains were formed within a few seconds at temperatures above 700°C. In the other steels, reversion took place by the shear mechanism, and ultra-fine grains were formed by the recrystallization of austenite at temperatures of 900°C or above. Partial reversion resulted in an excellent combination of yield strength and elongation in 301LN, and also in 301 such ones were attained in the reverted structure even before any profound formation of submicron grains.

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