Characterization of Cold Rolled Austenitic Stainless Steel by Ultrasonic Longitudinal Velocity

2012 ◽  
Vol 510-511 ◽  
pp. 475-480
Author(s):  
S.H. Khan ◽  
Aamer Nusair Khan
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Cold Rolling ◽  
Longitudinal Velocity ◽  
Life Assessment ◽  
Material Structure ◽  
Velocity Measurements ◽  
Cold Rolled ◽  
Non Destructive

Ultrasonic testing has a strong application in defect detection. An efficient tool for characterizing and life assessment of material structure and components by nondestructive ultrasonic velocity was developed about thirty years ago. Cold rolling results in increase in strength and hardness. The work discussed here is to study quantitative ultrasonic longitudinal velocity for characterizing a change in microstructure due to cold rolling in austenitic stainless steel samples. Samples were cold rolled upto 80 percent in 10 percent step. It was found that the use of velocity measurements is a useful quantitative and non-destructive tool for characterizing amount of cold rolled austenitic stainless steel.

Microstructural Characterization of Oxide Scale Formed by Early Stage of Oxidation of 17%Cr-Mn-Ni Austenitic Stainless Steel

2007 ◽  
Vol 561-565 ◽  
pp. 99-102
Author(s):  
Takayuki Oshima ◽  
Yutaka Yamaguchi ◽  
Kotaro Kuroda
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Oxide Scale ◽  
Spinel Structure ◽  
Early Stage ◽  
Microstructural Characterization ◽  
The Third ◽  
Cold Rolled ◽  
Mn Oxides

The microstructure of oxide scale formed in the early stage of oxidation of cold-rolled sheets of 17%Cr-Mn-Ni austenitic stainless steel was examined using SEM and TEM. Samples were oxidized at 973 to1373K for 1 to 15min. Nodules were observed on the surfaces of specimens oxidized at 1173K. The nodules were composed of two layers, which comprised Fe oxides and Cr-rich Fe-Cr-Mn oxides, respectively. The other scale was composed of two layers of Fe-Cr-Mn oxides with different compositions. Nodules were not observed on the surfaces of the specimens oxidized at 973 and 1373K. After oxidation at 1373K for 1min, the scale was composed of three layers. The first layer consisted of Fe-Mn oxides with a spinel structure, the second consisted mainly of Cr oxides, and the third consisted of Cr-Mn oxides containing a small amount of Fe.

Non-Destructive Characterization of Nickel-Base Hardface Deposit on Austenitic Stainless Steel Through Eddy Current and Magnetic Barkhausen Techniques

2012 ◽  
Vol 56 (11-12) ◽  
pp. 59-65 ◽  
Author(s):  
Gopa Chakraborty ◽  
Adurthi Viswanath ◽  
Chandan Kumar Mukhopadhyay ◽  
Velayutham Ramasubbu ◽  
Shaju Kattukaram Albert ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Eddy Current ◽  
Nickel Base ◽  
Non Destructive ◽  
Non Destructive Characterization

Predicting the Microstructural Evolution of an Austenitic Stainless Steel by Hybrid Modeling

2014 ◽  
Vol 783-786 ◽  
pp. 2154-2159 ◽  
Author(s):  
Andreas Johnsson ◽  
Mats Karlberg
Keyword(s):  
Heat Treatment ◽  
Grain Size ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Cold Rolling ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Sheet Material ◽  
Annealing Heat Treatment ◽  
Cold Rolled

During the annealing heat treatment following cold rolling of a 304L austenitic stainless steel sheet material, the material goes through changes in microstructure and mechanical properties. The cold rolling history together with the time/temperature trajectory in the annealing furnace can be used to model the final microstructure. In this work, physically based models for recrystallization and the following grain growth was created for the prediction of the microstructure evolution-both grain size and grain size distribution-, and an artificial neural network, ANN, was added for secondary effects. This is more commonly referred to as a hybrid model. The microstructure hybrid model was tested and validated against cold rolled and annealed production sheet material of various thicknesses and reductions, where the grain size and grain size distribution was measured by Electron Back Scatter Diffraction, EBSD. The recrystallization and grain growth parameters and functionality were fitted for non-isothermal conditions, against experimental tests of cold rolled material. Given process history and time/temperature data from the annealing heat treatment, the model can predict the microstructure, average grain size and grain size distribution with high accuracy and the executing time is short which makes it suitable for in-line use.

Metallurgical Characterization of Duplex Steel by Non Destructive Techniques

2010 ◽  
Vol 442 ◽  
pp. 330-334
Author(s):  
S.H. Khan ◽  
Aamer Nusair Khan ◽  
K. Mahmood
Keyword(s):  
Ultrasonic Velocity ◽  
Eddy Current ◽  
Cold Working ◽  
Longitudinal Velocity ◽  
X Ray ◽  
Duplex Steel ◽  
Cold Rolled ◽  
Metallurgical Characterization ◽  
Non Destructive

This paper describes the application of eddy current and ultrasonic velocity technique for the study of cold rolled duplex steel. Samples are cold rolled up to 80 percent and then tested for X-Ray diffractrometeric analysis, hardness testing, ultrasonic longitudinal velocity and for eddy-current testing. It was observed that eddy current impedance and longitudinal velocity is affected due to variation in micro-structure induced by cold working. It is suggested that eddy current and ultrasonic velocity techniques are useful tools for the characterization of duplex steel during cold working operation.

scholarly journals Non-destructive Micro-structural Characterization of Metallic Specimens with a Portable X-ray Diffraction based Residual Stress Analyzer

2015 ◽  
Vol 2 (1) ◽  
pp. 22 ◽  
Author(s):  
P. Ganesh ◽  
D. C. Nagpure ◽  
Rakesh Kaul ◽  
R. K. Gupta ◽  
L. M. Kukreja
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Crystallographic Texture ◽  
Diffraction Peak ◽  
Surface Microstructure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Non Destructive

Non-destructive characterization of surface microstructure of an engineering component is an important parameter to assess its fitness to function in the given service conditions. The paper describes various case studies performed in authors’ laboratory involving use of portable X-ray diffraction based residual stress analysis system to examine and understand the micro-structural state of the investigated surface. A significant decrease in full width at half maximum (FWHM) of gamma(311) diffraction peak from about 4.2° in the cold worked state to about 2.5° in the annealed/surface melted state was recorded for austenitic stainless steel. In case of 0.4% carbon steel there is sharp increase in FWHM of alpha(211) diffraction peak from about 2° in the as received condition to about 5-6° in the laser hardened condition. Crystallographic texture developed during electro-plating of chromium on stainless steel, could be detected from the strong intensity of alpha (211) peak of chromium at about 19° to the surface normal with respect to all other X-ray inclination angles (ѱ) during residual stress measurement. The results show that FWHM and intensity variation of the diffraction peak are two sensitive parameters for characterization of surface microstructure. Change in FWHM has been used to detect machining-induced cold deformation and evolution of re-crystallized grains in austenitic stainless steel and formation of hard martensite in laser transformation hardened ferritic steel. Variation in the intensity of diffracted peak with respect to X-ray inclination angle provided valuable information regarding crystallographic texture in hard chrome plated deposits.

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.

A TEM microscopical investigation of the magnetic domain structure of a metastable austenitic stainless steel

1994 ◽  
Vol 52 ◽  
pp. 696-697
Author(s):  
G. Fourlaris ◽  
T. Gladman
Keyword(s):  
Tensile Strength ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Cold Rolling ◽  
Solution Treatment ◽  
Magnetic Domain ◽  
High Strength ◽  
Medium Carbon Steel ◽  
Magnetic Characteristics ◽  
Metastable Austenitic Stainless Steel

Stainless steels have widespread applications due to their good corrosion resistance, but for certain types of large naval constructions, other requirements are imposed such as high strength and toughness , and modified magnetic characteristics.The magnetic characteristics of a 302 type metastable austenitic stainless steel has been assessed after various cold rolling treatments designed to increase strength by strain inducement of martensite. A grade 817M40 low alloy medium carbon steel was used as a reference material.The metastable austenitic stainless steel after solution treatment possesses a fully austenitic microstructure. However its tensile strength , in the solution treated condition , is low.Cold rolling results in the strain induced transformation to α’- martensite in austenitic matrix and enhances the tensile strength. However , α’-martensite is ferromagnetic , and its introduction to an otherwise fully paramagnetic matrix alters the magnetic response of the material. An example of the mixed martensitic-retained austenitic microstructure obtained after the cold rolling experiment is provided in the SEM micrograph of Figure 1.

Sign in / Sign up

Export Citation Format

Share Document