Strain rate sensitivity behaviour of Fe�21Cr-1.5Ni�5Mn alloy and its constitutive modelling

Dandekar, TR and Khatirkar, RK and Gupta, A and Bibhanshu, N and Bhadauria, A and Suwas, S (2021) Strain rate sensitivity behaviour of Fe�21Cr-1.5Ni�5Mn alloy and its constitutive modelling. In: Materials Chemistry and Physics, 271 .

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Abstract

In the present investigation, hot deformation behaviour of Fe�21Cr-1.5Ni�5Mn alloy was studied by performing isothermal unidirectional hot compression tests. The tests were carried out at strain rates of 0.01, 0.1, 1, 5 and 10 s�1 and at temperatures of 675, 750, 825, 900, 975 and 1050 °C. The samples were deformed up to 50 height reduction (ε = 0.7). The flow softening behaviour was modelled using Arrhenius hyperbolic sine law approach. The predicted flow stresses and the experimental flow stresses were found to be comparable indicating that the developed model can accurately portray flow behaviour of Fe�21Cr-1.5Ni�5Mn alloy. As-received and deformed specimens showed elongated grain structure. The correlation coefficient (R2) of the experimental and predicted results for Arrhenius hyperbolic sine law model was ~0.97, while the average absolute relative error (AARE) was found to be 7.31. The hot deformation activation energy for peak stress was found to be 508.3 kJ mol�1. The maximum value of �m� (0.227) was obtained in the temperature range 975 °C�1050 °C and strain rates between 0.1 s�1 to 1 s�1. �m� value between 0.1 and 0.2 is considered to be optimum for hot working. Deformation at 975 °C also gave the best match between experimental and predicted flow stress with m values between 0.1 and 0.2 and hence was considered optimum. © 2021 Elsevier B.V.

Item Type:	Journal Article
Publication:	Materials Chemistry and Physics
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Elsevier Ltd
Keywords:	Activation energy; Alloys; Compression testing; Hot pressing; Hot working; Plastic flow; Strain rate, Arrheniu hyperbolic sine law; Arrhenius; Fe�21cr-1.5ni�5mn alloy; Flow softening; Height reduction; Hot deformation behaviors; Hot-compression tests; Softening behavior; Strain-rate sensitivity; Strain-rates, Constitutive models
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	09 Dec 2021 09:28
Last Modified:	09 Dec 2021 09:28
URI:	http://eprints.iisc.ac.in/id/eprint/69583

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