Hot Deformation Constitutive Equation and Plastic Instability of 30Cr4MoNiV Ultra-High-Strength Steel

In this work, the hot deformation behavior of 30Cr4MoNiV ultra-high-strength steel is investigated by isothermal compression tests using the Gleeble-3500 thermal simulation machine (Dynamic Systems Inc., New York, NY, USA) at a temperature range of 1173–1373 K under the strain rate of 0.01–10 s<s...

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Main Authors: Gang Chen, Yuanchao Yao, Yuzhen Jia, Bin Su, Guoyue Liu, Bin Zeng
Format: Article
Language:English
Published: MDPI AG 2021-05-01
Series:Metals
Subjects:
Online Access:https://www.mdpi.com/2075-4701/11/5/769
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spelling doaj-09e98124620b4e0b9b852b9631203de32021-05-31T23:24:28ZengMDPI AGMetals2075-47012021-05-011176976910.3390/met11050769Hot Deformation Constitutive Equation and Plastic Instability of 30Cr4MoNiV Ultra-High-Strength SteelGang Chen0Yuanchao Yao1Yuzhen Jia2Bin Su3Guoyue Liu4Bin Zeng5College of Materials Science and Engineering, Hunan University, Changsha 410082, ChinaCollege of Materials Science and Engineering, Hunan University, Changsha 410082, ChinaSawing Engineering Research Center of Hunan Province, Changsha 410200, ChinaCollege of Materials Science and Engineering, Hunan University, Changsha 410082, ChinaSawing Engineering Research Center of Hunan Province, Changsha 410200, ChinaHunan Valin Lianyuan Iron and Steel Co., Ltd., Loudi 417000, ChinaIn this work, the hot deformation behavior of 30Cr4MoNiV ultra-high-strength steel is investigated by isothermal compression tests using the Gleeble-3500 thermal simulation machine (Dynamic Systems Inc., New York, NY, USA) at a temperature range of 1173–1373 K under the strain rate of 0.01–10 s<sup>−1</sup>. A constitutive equation with strain-dependent constants and processing maps suitable for 30Cr4MoNiV ultra-high-strength steel are established. The results show that the combination of the hyperbolic sine function and the Zener-Hollomon parameter can accurately represent the influences of deformation temperature, strain rate, and strain on the flow stress of the 30Cr4MoNiV ultra-high-strength steel. The applicability of plastic instability criteria such as <i>m</i>, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mover><mi>m</mi><mo>˙</mo></mover></semantics></math></inline-formula>, <i>S</i>, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mover><mi>S</mi><mo>˙</mo></mover></semantics></math></inline-formula> and the instability parameter <i>ξ</i> are analyzed, the stability and instability regions are clarified accurately, and the optimized processing regions are given in the stability regions. The optimized regions are verified by the uniform equiaxed grains, and the plastic instability is validated by dynamic strain aging and the microstructure of the voids.https://www.mdpi.com/2075-4701/11/5/769ultra-high-strength steelhot deformationconstitutive equationprocessing mapsplastic instability
collection DOAJ
language English
format Article
sources DOAJ
author Gang Chen
Yuanchao Yao
Yuzhen Jia
Bin Su
Guoyue Liu
Bin Zeng
spellingShingle Gang Chen
Yuanchao Yao
Yuzhen Jia
Bin Su
Guoyue Liu
Bin Zeng
Hot Deformation Constitutive Equation and Plastic Instability of 30Cr4MoNiV Ultra-High-Strength Steel
Metals
ultra-high-strength steel
hot deformation
constitutive equation
processing maps
plastic instability
author_facet Gang Chen
Yuanchao Yao
Yuzhen Jia
Bin Su
Guoyue Liu
Bin Zeng
author_sort Gang Chen
title Hot Deformation Constitutive Equation and Plastic Instability of 30Cr4MoNiV Ultra-High-Strength Steel
title_short Hot Deformation Constitutive Equation and Plastic Instability of 30Cr4MoNiV Ultra-High-Strength Steel
title_full Hot Deformation Constitutive Equation and Plastic Instability of 30Cr4MoNiV Ultra-High-Strength Steel
title_fullStr Hot Deformation Constitutive Equation and Plastic Instability of 30Cr4MoNiV Ultra-High-Strength Steel
title_full_unstemmed Hot Deformation Constitutive Equation and Plastic Instability of 30Cr4MoNiV Ultra-High-Strength Steel
title_sort hot deformation constitutive equation and plastic instability of 30cr4moniv ultra-high-strength steel
publisher MDPI AG
series Metals
issn 2075-4701
publishDate 2021-05-01
description In this work, the hot deformation behavior of 30Cr4MoNiV ultra-high-strength steel is investigated by isothermal compression tests using the Gleeble-3500 thermal simulation machine (Dynamic Systems Inc., New York, NY, USA) at a temperature range of 1173–1373 K under the strain rate of 0.01–10 s<sup>−1</sup>. A constitutive equation with strain-dependent constants and processing maps suitable for 30Cr4MoNiV ultra-high-strength steel are established. The results show that the combination of the hyperbolic sine function and the Zener-Hollomon parameter can accurately represent the influences of deformation temperature, strain rate, and strain on the flow stress of the 30Cr4MoNiV ultra-high-strength steel. The applicability of plastic instability criteria such as <i>m</i>, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mover><mi>m</mi><mo>˙</mo></mover></semantics></math></inline-formula>, <i>S</i>, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mover><mi>S</mi><mo>˙</mo></mover></semantics></math></inline-formula> and the instability parameter <i>ξ</i> are analyzed, the stability and instability regions are clarified accurately, and the optimized processing regions are given in the stability regions. The optimized regions are verified by the uniform equiaxed grains, and the plastic instability is validated by dynamic strain aging and the microstructure of the voids.
topic ultra-high-strength steel
hot deformation
constitutive equation
processing maps
plastic instability
url https://www.mdpi.com/2075-4701/11/5/769
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