Dynamic Recrystallization of Austenite in 18-8 Stainless Steel and 18 Ni Maraging Steel and Its Related Phenomena

Maki, Tadashi; Akasaka, Koichi; Okuno, Koji; Tamura, Imao

doi:10.2355/tetsutohagane1955.66.12_1659

Cited by 21 publications

(11 citation statements)

References 10 publications

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“…(1) from elevated temperature tensile tests for 18Ni maraging steel and 188 stainless steel respectively. 10) Obtained exponent n def in this study is similar to those although they are not given from same material. In various kinds of pure metal and alloy, larger value compared to selfdiffusion energy or volume diffusion of alloying element is obtained in case that dynamic recrystallization is dominant mechanism of dynamic restoration.…”

Section: Deformation Behaviorsupporting

confidence: 77%

High Temperature Deformation and Dynamic Recrystallization Behavior of Alloy718

Matsui¹

2013

Mater. Trans.

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Ni base superalloy is one of the representative heat resistant materials for high temperature environment in various industrial applications. As for cast and wrought material, thermo-mechanical processing during hot forging has a significant role to control and optimize crystal grain structure in order to attain required critical properties. The essential deformation and dynamic recystallization behavior of Ni base superalloy, Alloy718 during hot forging were revealed through hot compression tests and quantitative relations among various parameters that were available for numerical calculation were derived. Dynamically recrystallized grain diameter depended on temperature, strain rate and was independent of initial grain diameter and strain. And the grain diameter was expressed as a function of the temperature compensated strain rate, i.e., ZenerHollomon parameter quantitatively. Avrami-type equation was available for comprehensive and quantitative expression of dynamic recrystallization transition tendency. And the fraction of dynamic recrystallization was a function of the given strain and the strain for 50% recrystallization which depended on the initial grain diameter and ZenerHollomon parameter.

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Section: Deformation Behaviorsupporting

confidence: 77%

High Temperature Deformation and Dynamic Recrystallization Behavior of Alloy718

Matsui¹

2013

Mater. Trans.

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“…Metallographic examination revealed that dynamic recrystallisation started at a fraction of approximately 0.8 of the peak strain, originated by local bulging of grain boundaries. A similar study was performed by Maki and colleagues [36,37]. These authors analyzed the DRX behavior of austenite in an 18-8 stainless steel and an 18 Ni maraging steel by microstructural observations of the water-quenched specimens deformed under tensile deformation, applying different strain rates and temperatures, ranging from 1073 K (800 • C) to 1473 K (1200 • C) and from 1.0 × 10 −3 to 1.0 × 10 −1 s −1 , respectively.…”

Section: Metallographic Determinationsupporting

confidence: 55%

Critical Strain for Dynamic Recrystallisation. The Particular Case of Steels

Varela-Castro

Cabrera

Prado

2020

Metals

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The knowledge of the flow behavior of metallic alloys subjected to hot forming operations has particular interest for metallurgists in the practice of industrial forming processes involving high temperatures (e.g., rolling, forging, and/or extrusion operations). Dynamic recrystallisation (DRX) occurs during high temperature forming over a wide range of metals and alloys, and it is known to be a powerful tool that can be used to control the microstructure and mechanical properties. Therefore, it is important to know, particularly in low stacking fault energy materials, the precise time at which DRX is available to act. Under a constant strain rate condition, and for a given temperature, such a time is defined as a critical strain (εc). Unfortunately, this critical value is not always directly measurable on the flow curve; as a result, different methods have been developed to derive it. Focused on carbon and microalloyed steels subjected to laboratory-scale testing, in the present work, the state of art on the critical strain for the initiation of DRX is reviewed and summarized. A review of the different methods and expressions for assessing the critical strain is also included. The collected data are well suited to feeding constitutive models and computational codes.

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“…As temperature could be controlled precisely using proposed heating and rolling equipment, it could be helpful to realize precise control of microstructure of stainless steel. [7][8][9][10] Microstructure control of austenitic stainless steel is really important because SUS304 steel does not exhibit microstructure change due to phase transformation.…”

Section: Change In Microstructure After Continuous Heat-mentioning

confidence: 99%

Continuous Heating System Using Electric Resistance Heating for the Hot Rolling of Stainless Steels.

Asano

Nishi

2002

ISIJ International

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Electric resistance of metals increases according to the elevation in temperature. Non-uniform temperature distribution in cross-section can be automatically sacrificed if we use electric resistance heating, and uniformly distributed cross-sectional temperature can be easily obtained. A continuous heating system using electronic resistance heating is developed, and its characteristics to the heating of stainless steel are examined through a series of basic experiments. Through the investigation, it has become clear that uniform continuous heating of stainless steel can be realized by proposed heating system. Although the composition of heating system is quite simple, high rate in temperature elevation can be obtained. Also, we can precisely control the temperature distribution in feeding (rolling) direction by continuous electric resistance heating, because temperature of metals can be rapidly changed only by changing the degree of electric current and time to impose electric current.

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Dynamic Recrystallization of Austenite in 18-8 Stainless Steel and 18 Ni Maraging Steel and Its Related Phenomena

Cited by 21 publications

References 10 publications

High Temperature Deformation and Dynamic Recrystallization Behavior of Alloy718

High Temperature Deformation and Dynamic Recrystallization Behavior of Alloy718

Critical Strain for Dynamic Recrystallisation. The Particular Case of Steels

Continuous Heating System Using Electric Resistance Heating for the Hot Rolling of Stainless Steels.

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