Flow behaviour and constitutive modelling of a ferritic stainless steel at elevated temperatures

The tensile test of casting ferritic stainless steel was conducted on SHIMADZU AG-10 at different temperatures of 300, 500, 600, 700, 800, and 950°C, respectively. The engineering stress-strain curves with the thermal deformation at the different temperatures, the tensile strength and elongation curves were obtained. Metallographic test samples were prepared and the morphology of deforming zone was observed by optical microscopy. The experimental results showed that the tensile strength of the test samples decreased with increasing temperature. From 300 to 500°C, the work hardening occurred and the tensile strength increased with increasing engineering strain. The softening occurred and the tensile strength decreased with increasing engineering strain at temperatures from 600 to 950°C. The strength of 430 stainless steel decreased, and the plasticity increased with the increase in temperature. The fractures were basically intergranular fractures within the range of 300~950°C. A transition occurred to the form of fracture from the ductile to the brittle, which might be related to the nitrogen atom in the 430. Grain deformation along specimen tensile direction concentrated in the necking region, where appeared banded structure in martensite. The organization at the edge of the sample was fine, while the organization at the central region was coarser.

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Strain Rate Sensitivity Behaviour of a Chrome-Nickel Austentic-Ferritic Stainless Steel and its Constitutive Modelling

ISIJ International ◽

10.2355/isijinternational.isijint-2018-051 ◽

2018 ◽

Vol 58 (10) ◽

pp. 1840-1849 ◽

Cited By ~ 2

Author(s):

Amit Kumar ◽

Aman Gupta ◽

Rajesh Kisni Khatirkar ◽

Nitish Bibhanshu ◽

Satyam Suwas

Keyword(s):

Stainless Steel ◽

Strain Rate ◽

Strain Rate Sensitivity ◽

Ferritic Stainless Steel ◽

Rate Sensitivity ◽

Constitutive Modelling

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Material Characterisation and Constitutive Modelling of a Copper Alloy and Stainless Steel at Cryogenic and Elevated Temperatures

Materials Science Forum ◽

10.4028/www.scientific.net/msf.830-831.242 ◽

2015 ◽

Vol 830-831 ◽

pp. 242-245

Author(s):

A.K. Asraff ◽

S. Sheela ◽

Krishnajith Jayamani ◽

S. Sarath Chandran Nair ◽

R. Muthukumar

Keyword(s):

Stainless Steel ◽

Copper Alloy ◽

High Performance ◽

Elevated Temperatures ◽

Outer Wall ◽

Constitutive Modelling ◽

Rocket Engines ◽

Structural Elements ◽

Thrust Chamber ◽

High Thrust

High performance rockets are developed using cryogenic technology. High thrust cryogenic rocket engines operating at elevated temperatures and pressures are the backbone of such rockets. The thrust chamber of such engines, which produce the thrust for the propulsion of the rocket, can be considered as structural elements. Often double walled construction is employed for these chambers for better cooling and enhanced performance. The thrust chamber investigated here has its hot inner wall fabricated out of a high conductivity high ductility copper alloy and outer wall made of a ductile stainless steel. The engine is indigenously designed and developed by ISRO and is undergoing hot tests. Inner wall is subjected to high thermal and pressure loads during operation of engine due to which it will be in the plastic regime. Evaluation of tensile properties of the copper alloy and stainless steel up to fracture, at cryogenic, ambient and elevated temperatures in parent metal and welded forms is of paramount importance for its constitutive modelling and thermo structural analysis of the thrust chamber.

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Low-cycle Fatigue Behavior and Constitutive Relations for a Ferritic Stainless Steel at Elevated Temperatures

Current Journal of Applied Science and Technology ◽

10.9734/cjast/2020/v39i330512 ◽

2020 ◽

pp. 34-46

Author(s):

S. M. Humayun Kabir ◽

Tae-In Yeo

Keyword(s):

Numerical Simulation ◽

Stainless Steel ◽

Ferritic Stainless Steel ◽

Constitutive Equations ◽

Elevated Temperatures ◽

Low Cycle Fatigue ◽

Fatigue Behavior ◽

Constitutive Relations ◽

Peak Stress ◽

Effect Of Temperature

In this paper, the tensile and strain-controlled cyclic deformation behavior of a ferritic stainless steel which is developed for the exhaust manifold of automobiles is evaluated experimentally at different temperatures. The effect of temperature on monotonic tensile responses such as yield strength and ultimate tensile strength and the effect of temperature and strain amplitude on the evolution of peak stress are assessed. The objective of this study is also to reveal the mixed mode of cyclic hardening–softening behavior of the ferritic stainless steel under strain-controlled fatigue test conditions. A parameter, critical accumulated plastic strain, is introduced to the constitutive equations for the material for describing the hardening - softening responses. The nonlinear constitutive equations for describing the cyclic responses are implemented into Finite Element code using determined parameters for obtaining numerical simulation. The stabilized hysteretic responses obtained from experiment and predicted from numerical simulation are compared and found to be realistic.

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Buckling response of ferritic stainless steel columns at elevated temperatures

Research and Applications in Structural Engineering, Mechanics and Computation ◽

10.1201/b15963-266 ◽

2013 ◽

pp. 557-558 ◽

Cited By ~ 2

Keyword(s):

Stainless Steel ◽

Ferritic Stainless Steel ◽

Elevated Temperatures ◽

Steel Columns

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OUTOKUMPU MODA 439/4510

Alloy Digest ◽

10.31399/asm.ad.ss1341 ◽

2021 ◽

Vol 70 (11) ◽

Keyword(s):

Stainless Steel ◽

Corrosion Resistance ◽

Physical Properties ◽

Tensile Properties ◽

Ferritic Stainless Steel ◽

Intergranular Corrosion ◽

Elevated Temperatures ◽

Heat Treating ◽

Automotive Exhaust ◽

Corrosive Environments

Abstract Outokumpu Moda 439/4510 is a titanium-stabilized 17% chromium ferritic stainless steel that exhibits improved corrosion resistance, formability, and weldability when compared to Outokumpu Moda 430/4016. It is best suited for mildly corrosive environments. Because of its titanium alloying, Outokumpu Moda 439/4510 can be welded in all dimensions without becoming susceptible to intergranular corrosion. It is possible to use Outokumpu Moda 439/4510 at elevated temperatures, for example the cold end of automotive exhaust systems. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-1341. Producer or source: Outokumpu Oyj.

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