Improvement of the forgability of 17-4 precipitation hardening stainless steel by ausforming

Isogawa, Sachihiro; Yoshida, Hiroaki; Hosoi, Yuzô; Tozawa, Yasuhisa

doi:10.1016/s0924-0136(97)00286-0

Cited by 26 publications

(16 citation statements)

References 2 publications

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“…Analysis of the correlation coefficient (R 2 ) of these regression values reveals that Eq. [12] has better fit to experimental data. Therefore, the activation energy of hot working was considered to be 337 kJ/mol.…”

Section: F Activation Energy Of Hot Workingmentioning

confidence: 92%

“…The linear regression of these data results in the average values of 337, 543, and 442 kJ/mol for activation energy from Eqs. [12], [13], and [14], respectively. There is a significant difference between these values.…”

Section: F Activation Energy Of Hot Workingmentioning

confidence: 99%

“…[1,2] Despite the extensive work carried out on some aspects of 17-4 PH stainless steel, [2][3][4][5][6][7][8][9][10][11] very few studies have been reported on high-temperature deformation of this alloy. [12,13] The martensitic PH stainless steels such as 17-4 PH are used in aerospace, chemical, petrochemical, and food processing applications and commonly viewed as bar alloys. Industrial hot deformation processing such as forging for these steels is conducted in the temperature range of stability of austenite phase.…”

Section: Introductionmentioning

confidence: 99%

“…Industrial hot deformation processing such as forging for these steels is conducted in the temperature range of stability of austenite phase. [12][13][14] Due to low stacking fault energy of austenite in the 17-4 PH stainless steel, the major restoration process during hot deformation is dynamic recrystallization (DRX). Determination of hot flow behavior and deformation resistance is quite important for successful production of this steel in accordance with aerospace specifications.…”

Section: Introductionmentioning

confidence: 99%

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Flow Curve Analysis of 17-4 PH Stainless Steel under Hot Compression Test

Mirzadeh

Najafizadeh

Moazeny

2009

Metall Mater Trans A

133

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The hot compression behavior of a 17-4 PH stainless steel (AISI 630) has been investigated at temperatures of 950°C to 1150°C and strain rates of 10 À3 to 10 s À1 . Glass powder in the Rastegaev reservoirs of the specimen was used as a lubricant material. A step-by-step procedure for data analysis in the hot compression test was given. The work hardening rate analysis was performed to reveal if dynamic recrystallization (DRX) occurred. Many samples exhibited typical DRX stress-strain curves with a single peak stress followed by a gradual fall toward the steady-state stress. At low Zener-Hollomon (Z) parameter, this material showed a new DRX flow behavior, which was called multiple transient steady state (MTSS). At high Z, as a result of adiabatic deformation heating, a drop in flow stress was observed. The general constitutive equations were used to determine the hot working constants of this material. Moreover, after a critical discussion, the deformation activation energy of 17-4 PH stainless steel was determined as 337 kJ/mol.

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Section: F Activation Energy Of Hot Workingmentioning

confidence: 92%

Section: F Activation Energy Of Hot Workingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Flow Curve Analysis of 17-4 PH Stainless Steel under Hot Compression Test

Mirzadeh

Najafizadeh

Moazeny

2009

Metall Mater Trans A

133

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“…The term ausforming, originating from the technology of high strength steels (Franz and Hornbogen, 1998), is a thermomechanical treatment used to improve the microstructure and mechanical properties in terms of strength and toughness of high-alloy steels (Franz and Hornbogen, 1998;Isogawa et al, 1998;Hornbogen, 1999). Otherwise ausforging consists in heating the material until the austenitization temperature is reached.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of ausforged 27MnSiVS6 microalloyed steel

Caminaga

Button

2013

Rem: Rev. Esc. Minas

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ResumoOs processos de forjamento a quente aplicados aos aços microligados, também conhecidos como aços de alta resistência e baixa liga (ARBL), têm uma extensa aplicação na produção de componentes automotivos. O objetivo desse trabalho foi o de estudar o comportamento microestrutural por microscopia óptica e o comportamento mecânico, em termos de propriedades de resistência e tenacidade do aço microligado 27MnSiVS6, quando empregado no processo denominado "ausforging", a fim de se analisarem o desempenho do processo e a qualidade dos produtos, comparando-os com os processos de forjamento a quente e a morno. Os produtos forjados provenientes do "ausforging" que foram submetidos aos ensaios de tração unidirecional, fadiga em flexão rotativa e tenacidade à fratura, apresentaram as melhores propriedades mecânicas. Os testes estatísticos aplicados aos resultados permitiram concluir que os produtos obtidos por "ausforging" apresentaram a melhor combinação de resistência mecânica e qualidade superficial dos produtos forjados, sem aumentar a carga de forjamento.Palavras-chave: "Ausforging", forjamento, metalurgia física. Abstract

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Hardness and Microstructure of a Newly Developed Stainless Steel after Ausforming

Seifert

Botzet

Theisen

2017

steel research int.

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In this work, ausforming is applied to a newly developed stainless steel. This process consists of austenitisation, quenching to a deformation temperature above room temperature, deformation of the metastable austenitic microstructure without the formation of martensite, and subsequent quenching in liquid nitrogen. The investigated steel is explicitly developed to be processed by ausforming and manufactured as a laboratory size test melt. The aim is to achieve a steel having a high hardness as well as a high corrosion resistance. Instead of conventional quenching and tempering, conventional processing is followed by ausforming. A parameter study incorporating the austenitisation temperature and time, deformation temperature, deformation speed, and degree of deformation is performed to achieve maximum hardness. Furthermore, the influence of soft annealing prior to ausforming is also investigated. The hardness of ausformed specimens is measured and correlated to the parameters used for processing. The microstructure of selected specimens is also investigated. Surprisingly, small amounts of martensite are found after ausforming, although a hardness of about 600 HV10 is achieved. In fact, a highly deformed austenitic microstructure is found predominantly.

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Improvement of the forgability of 17-4 precipitation hardening stainless steel by ausforming

Cited by 26 publications

References 2 publications

Flow Curve Analysis of 17-4 PH Stainless Steel under Hot Compression Test

Flow Curve Analysis of 17-4 PH Stainless Steel under Hot Compression Test

Mechanical properties of ausforged 27MnSiVS6 microalloyed steel

Hardness and Microstructure of a Newly Developed Stainless Steel after Ausforming

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