Prediction of the formability of metastable low nickel austenitic stainless steel sheets

Raj, Amrit; Padmanabhan, K. A.

doi:10.1016/s0924-0136(99)00106-5

Cited by 3 publications

(1 citation statement)

References 21 publications

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“…Where Y 1i is the i th estimated major strain, e 2i is the i th experimental minor strain, X degree of polynomial providing best fit with least error, a's are the polynomial coefficients. of plots can be accessed in other journal papers written by the authors [Kanniraj et al 1998]. Constraint factor f and error in f were evaluated using Equations 12 and 13 respectively, and plotted against true peak minor strain.…”

Section: Formability Testing and Microstructural Analysismentioning

confidence: 99%

A Formability of Two Copper-Bearing, Cold Rolled, Box Annealed and Temper Rolled Extra-Deep Drawing Low Carbon Aluminium-Killed Steel Sheets of Nagarjuna Steel Limited (Private, Andhra), and a Comparison with that of a Typical Steel Sheets Made by Bokaro Steel Plant (Steel Authority of India Limited, Ministry of Steel, Government of India)

Raj¹,

Tjprc²

2019

IJMPERD

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This market-driven research publication is on the formability of two extra-deep drawing (EDD) steels in whose manufacture scrap addition is present and their chemistry may in turn show the presence of residual copper. It is known that the heat treatment response is significantly affected by the presence of copper. The present study was undertaken to evaluate the formability of two copper-bearing EDD steel sheets (0.07%Cu and 0.13%Cu). With the help of specially fabricated punch-die set up, stretching experiments were performed and in turn forming limit diagram (FLD) was plotted. Preliminary tests assess microstructural features, their behaviour in tension and formability parameters were also performed on both EDD sheets. It has been seen that both the 0.07%Cu and the 0.13%Cu EDD steel sheets displayed poor deep-drawability compared to 0.01%Cu EDD steel, mainly because of their low average plastic strain ratio (ř). The lower ř value (and as a consequences the reduced deep-drawability, especially, in the extra-deep drawing region) observed in the 0.07%Cu and 0.13%Cu EDD steel sheets could be due to poor processing, eg., use of a higher heating rate and reduced annealing time. TEM studies revealed no evidence for Cu precipitation in both the 0.07%Cu and 0.13%Cu EDD steels. Intensities of {111} texture components are low and in turn these heats show low formability.

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Section: Formability Testing and Microstructural Analysismentioning

confidence: 99%

A Formability of Two Copper-Bearing, Cold Rolled, Box Annealed and Temper Rolled Extra-Deep Drawing Low Carbon Aluminium-Killed Steel Sheets of Nagarjuna Steel Limited (Private, Andhra), and a Comparison with that of a Typical Steel Sheets Made by Bokaro Steel Plant (Steel Authority of India Limited, Ministry of Steel, Government of India)

Raj¹,

Tjprc²

2019

IJMPERD

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Sheet metal formability studies at the national institute of standards and technology

Foecke

Banovic

Fields

2001

JOM

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Overview Wrought and SheetSheet-metal forming is a multi-billiondollar industry in the United States, with an overwhelming portion of its use in automotive markets as formed-sheet components. With roughly one-third of the weight of an auto in this form, the Big Three automakers (Ford, General Motors, and Daimler-Chrysler) are looking for lighter, yet highstrength alternative sheet materials. Such materials would reduce the overall weight of vehicles, helping the automakers achieve gas mileage goals set down in the Partnership for a New Generation of Vehicles. Progress has been slow, however, because of a lack of knowledge and experience in forming these new materials. The National Institute of Standards and Technology, in keeping with its mission to assist industry by developing technology and standard test methods, has initiated a program to help the auto industry, as well as other industries that produce and utilize sheet metal, make the transition to these new materials.

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Constitutive Modeling and Finite Element Analysis of the Formability of TRIP Steels

Serri

Cherkaoui

2008

Journal of Engineering Materials and Technology

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The semiphysics constitutive model developed by Cherkaoui et al. (2006, “From Micro to Macroscopic Description of Martensitic Transformation in Steels: A Viscoplastic Model,” Philos. Mag., in press;) has been implemented in the user’s material subroutine of the finite element code ABAQUS∕EXPLICIT (2006, Version 6.6 Manuals, Dassault Systemes) to predict the thermomechanical behavior of unstable transformation induced plasticity (TRIP) steel sheets under conditions of forming, which are essentially composite materials with evolving volume fractions of the individual phases. These steels undergoing α′ martensitic phase transformation exhibit an additional inelastic strain resulting from the phase transformation itself and from the plastic accommodation in parent (austenite) and product (martensite) phases due to different sources of internal stresses. This inelastic strain known as the TRIP strain enhances ductility at an appropriate strength level due to the typical properties of the martensite. A numerical analysis of the effects of the martensitic phase transformation on formability is performed. A validation of the stress-strain behavior and the volume fraction of the martensite are carried out in the case of multiaxial paths at various temperatures. The effects of the stress state and of the kinetics of the martensite phase transformation are analyzed in the case of the cup drawing test. Finally, the numerical predictions are compared to experimental tests on type AISI304 austenitic stainless steels and TRIP800 multiphase industrial steels.

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Prediction of the formability of metastable low nickel austenitic stainless steel sheets

Cited by 3 publications

References 21 publications

Sheet metal formability studies at the national institute of standards and technology

Constitutive Modeling and Finite Element Analysis of the Formability of TRIP Steels

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