Analysis of Tensile Stress-Strain and Work-Hardening Behavior in 9Cr-1Mo Ferritic Steel

Choudhary, B.K.; Palaparti, D.P. Rao; Samuel, E. Isaac

doi:10.1007/s11661-012-1385-0

Cited by 44 publications

(39 citation statements)

References 38 publications

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“…7) and in the variations of work hardening parameters associated with Voce equation (Figs. 9e12) for P92 steel are in agreement with those reported for 9% Cr ferritic steels [22,23,27]. The observed three temperature regimes in P92 steel also compare favourably with those reported for the flow and work hardening behaviour of austenitic stainless steel [29,30].…”

Section: Variations Of Instantaneous Work Hardening Rate With Stresssupporting

confidence: 88%

“…Also, rapid increase in n V,Voce (Fig. 11) [22,23]. A change in controlling mechanism from cross-slip to dislocation climb and subboundary migration at high temperatures leads to high n V,Voce values [22,23] as observed in the present investigation.…”

Section: Variations Of Instantaneous Work Hardening Rate With Stresssupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

“…One of the important gains from the applicability of Voce equation has been shown by the equivalence between the predicted flow parameters such as initial and saturation stresses with the respective strength values obtained from the tensile test [22,23]. It has been suggested that the use of Voce equation as a single flow relationship to describe the true stressetrue plastic strain behaviour in P9 and P91 steels for the entire temperature range of interest is useful for engineering applications [22,23]. In this paper, the applicability of Voce equation [6] for describing the true stress (s)-true plastic strain (ε) behaviour of P92 ferritic steel has been examined for the strain rates ranging from 3.16 Â 10 À5 to 1.26 Â 10 À3 s À1 over a temperature range 300e923 K. The work hardening behaviour has been investigated in terms of the variations of instantaneous work hardening rate (q ¼ ds/dε) with true stress for the range of temperatures and strain rates used in this study.…”

Section: Introductionmentioning

confidence: 99%

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Applicability of Voce equation for tensile flow and work hardening behaviour of P92 ferritic steel

Sainath

Choudhary

Christopher

et al. 2015

International Journal of Pressure Vessels and Piping

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Section: Variations Of Instantaneous Work Hardening Rate With Stresssupporting

confidence: 88%

Section: Variations Of Instantaneous Work Hardening Rate With Stresssupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Applicability of Voce equation for tensile flow and work hardening behaviour of P92 ferritic steel

Sainath

Choudhary

Christopher

et al. 2015

International Journal of Pressure Vessels and Piping

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“…2,9,10 The DSS microstructure generally consists of around 50 % d-ferrite and 50 % g-austenite, which gives them excellent properties, but also provides for a narrow window in the hot-working process. During hot working, ferrite and ferritic stainless steels undergo dynamic recovery (DRV), 11 which means that subgrains develop in the microstructure, as is the case for the hot working of duplex stainless steels, 12 while austenite and austenitic stainless steels undergo a high degree of strain hardening and then dynamic recrystallization (DRX). 8 While the austenite is dominated by high-angle grain boundaries (HAB), ferrite shows a substantial amount of subgrain boundaries, i.e., low-angle grain boundaries (LAB).…”

Section: Introductionmentioning

confidence: 99%

Hot tensile testing of SAF 2205 duplex stainless steel

Tehovnik¹,

Žužek²,

Burja³

2016

Mater. Tehnol.

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The changes to the microstructure of the duplex stainless steel SAF 2205 during hot tensile tests were investigated. The dominant restoration mechanisms for ferrite and austenite were dynamic recovery (DRV) and dynamic recrystallization (DRX), respectively. Also, the effect of temperature on the deleterious phase precipitation was investigated. The specimens were tested with hot tensile deformation tests in the temperature range from 800°C to 1100°C. The tensile strength of the investigated steel decreased rapidly in the temperature range from 800°C to 950°C and slowly at the testing temperatures from 1000°C to 1100°C. It was found that SAF 2205 has excellent hot-working properties at temperatures between 950°C and 1100°C. The differences in the mechanical properties of austenite and ferrite along with the precipitation of the s-phase represent the most important restrictions during hot working. Optical microscopy was used for the microstructure-evolution analysis in the duplex stainless steel during the hot tensile tests. Keywords: duplex stainless steel, hot tensile test, microstructural evolution, intermetallic phases, s-phase Preiskovali smo spremembe mikrostrukture dupleks nerjavnega jekla SAF 2205 med vro~imi nateznimi preskusi. Prevladujo~a mehanizma meh~anja v feritu in avstenitu sta bila dinami~na poprava in/ali dinami~na rekristalizacija. V dupleks nerjavnem jeklu je bil raziskan vpliv temperature na izlo~anje {kodljivih faz. Vzorce smo vro~e natezno presku{ali v temperaturnem obmo~ju med 800°C in 1100°C. Natezna trdnost preiskanega jekla se je hitro zni`ala v temperaturnem obmo~ju med 800°C in 950°C ter po~asneje pri temperaturah preskusov med 1000°C in 1100°C. Ugotovili smo, da ima SAF 2205 odli~ne vro~e preoblikovalne lastnosti v temperaturnem obmo~ju med 950°C in 1100°C. Najve~je omejitve pri preoblikovanju predstavljajo razlike v mehanskih lastnostih med avstenitom in feritom ter izlo~anje s-faze. V raziskavi je bila uporabljena opti~na mikroskopija za analizo razvoja mikrostrukture v dupleks nerjavnem jeklu med vro~imi nateznimi preskusi. Klju~ne besede: dupleks nerjavno jeklo, vro~i natezni preskusi, razvoj mikrostrukture, intermetalne faze, s-faza

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Synergistic Strengthening by Severe Plastic Deformation and Post‐Heat Treatment of a Low‐Carbon Steel

Soleimani

Kazeminezhad

2018

steel research int.

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Low-carbon steel sheets are severely plastic deformed to strains of up to %3.48 and subsequently heat treated by conventional annealing followed by water-quenching. Four temperatures are chosen for the annealing below and over the A c1 and A c3 transformation lines. The effects of post-deformation heat treatment are investigated by evaluating the microstructure and mechanical properties, including strength, ductility, work hardening capability, and hardness. A maximum increase of 86% in the strength is obtained through intercritical annealing and quenching of the samples subjected to strain of 1.16. It is interesting that both the elongation and ultimate tensile strength values are higher after heat treatment at a variety of temperatures in comparison with those of the non-treated samples; up to 197% for the former and up to 33% for the latter. These would be achieved in combination with yield ratios even lower than that of the as-received material, demonstrating the higher deformation capability of the specimens. However, these beneficial outcomes are deteriorated toward higher amounts of strain. Despite the heat treated undeformed low-carbon steels, the stress À strain curves for heat treated deformed samples show little or no discontinuous yielding correlated to variations of mobile dislocations density as a result of microstructural evolution.

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Analysis of Tensile Stress-Strain and Work-Hardening Behavior in 9Cr-1Mo Ferritic Steel

Cited by 44 publications

References 38 publications

Applicability of Voce equation for tensile flow and work hardening behaviour of P92 ferritic steel

Applicability of Voce equation for tensile flow and work hardening behaviour of P92 ferritic steel

Hot tensile testing of SAF 2205 duplex stainless steel

Synergistic Strengthening by Severe Plastic Deformation and Post‐Heat Treatment of a Low‐Carbon Steel

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