Impact of the thermomechanical load on subsurface phase transformations during cryogenic turning of metastable austenitic steels

Hotz, Hendrik; Kirsch, Benjamin; Aurich, Jan C.

doi:10.1007/s10845-020-01626-6

Cited by 13 publications

(6 citation statements)

References 53 publications

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“…Hence, transformation of austenite to martensite cannot be observed in this regime and only plastic deformation of austenite can be possible. 1,33,34,41,42,[52][53][54][55]…”

Section: Thermodynamics Of Austenite To Martensite Transformationmentioning

confidence: 99%

A critical review on deformation-induced transformation kinetics of austenitic stainless steels

Jain,

Varshney

2024

Materials Science and Technology

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Deformation-induced austenite to martensite transformation is an important phenomenon during the deformation of metastable fully austenitic transformation induced plasticity (TRIP) steels. The kinetics of austenite to martensite transformation influence the deformation behaviour of austenitic stainless steels but is often neglected by the materials community. In this paper, after an initial discussion on thermodynamics and mechanism, the importance of deformation-induced transformation kinetics is briefly outlined and the influence of various parameters like grain size, deformation temperature, strain rate, stress state and prior austenite deformation on the transformation kinetics is critically assessed. Variation of transformation kinetics with various parameters has been identified and justified. These variations could act as a ready reference for designing austenitic stainless steels with the desired set of mechanical properties and deformation behaviour. Further in this paper, selected models that can predict the transformation kinetics are reviewed and compared. In the end, research fronts related to transformation kinetics that can be further explored have been identified.

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“…Hence, transformation of austenite to martensite cannot be observed in this regime and only plastic deformation of austenite can be possible. 1,33,34,41,42,[52][53][54][55]…”

Section: Thermodynamics Of Austenite To Martensite Transformationmentioning

confidence: 99%

A critical review on deformation-induced transformation kinetics of austenitic stainless steels

Jain,

Varshney

2024

Materials Science and Technology

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“…The increase of the feed rate, as well as the cutting‐edge radius led to a higher passive force and therefore favored the deformation‐induced martensite formation. However, these adjustments also led to an increase in surface roughness due to process kinematics and ploughing effects [29, 30].…”

Section: Experimental Setup and Approachmentioning

confidence: 99%

Influence of cryogenic turning strategies on the surface morphology and resulting wear behavior of metastable AISI 347 austenitic stainless steel

Zhu,

Smaga,

Thielen

et al. 2024

Materialwissenschaft Werkst

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Cryogenic turning of metastable austenitic stainless steels can improve wear resistance of the resulting surface due to the phase transformation of γ‐austenite into α’‐ and/or ϵ‐martensite in the near surface layer. By using a cryogenic two‐step turning process, the amount of deformation‐induced α’‐martensite in the subsurface regime can be further increased. To determine the influence of the implemented and optimized two‐step turning strategy on the tribological properties of countersurfaces for radial shaft seals, an evaluation of wear behavior of the shaft seal countersurface as well as microstructural analyses in subsurface regime is presented and compared to the cryogenic single step turning process. The results show that not only the integral phase transformation in the overall subsurface region, but also the local phase distribution plays an important role when it comes to the surface performance in tribological applications.

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“…The thermodynamics required for the phase transformation from austenite γ to martensite α is shown in Figure 1 [5]. The phase transformation mainly occurs in one of the following three ways: (a) temperatures below the critical temperature M s , (b) temperatures above M s while elastic stress provides kinetic phase transformation, or (c) temperatures above M s while plastic tensile force provides kinetic phase transformation.…”

Section: Introductionmentioning

confidence: 99%

Constitutive Models for the Strain Strengthening of Austenitic Stainless Steels at Cryogenic Temperatures with a Literature Review

He,

Wang,

2023

Metals

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Austenitic stainless steels are widely used in cryogenic pressure vessels, liquefied natural gas pipelines, and offshore transportation liquefied petroleum gas storage tanks due to their excellent mechanical properties at cryogenic temperatures. To meet the lightweight and economical requirements, pre-strain of austenitic stainless steels was conducted to improve the strength at cryogenic temperatures. The essence of being strengthened by strain (strain strengthening) and the phase-transformation mechanism of austenitic stainless steels at cryogenic temperatures are reviewed in this work. The mechanical properties and microstructure evolution of austenitic stainless steels under different temperatures, types, and strain rates are compared. The phase-transformation mechanism of austenitic stainless steels during strain at cryogenic temperatures and its influence on strength and microstructure evolution are summarized. The constitutive models of strain strengthening at cryogenic temperatures were set to calculate the volume fraction of strain-induced martensite and to predict the mechanical properties of austenitic stainless steels.

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Impact of the thermomechanical load on subsurface phase transformations during cryogenic turning of metastable austenitic steels

Cited by 13 publications

References 53 publications

A critical review on deformation-induced transformation kinetics of austenitic stainless steels

A critical review on deformation-induced transformation kinetics of austenitic stainless steels

Influence of cryogenic turning strategies on the surface morphology and resulting wear behavior of metastable AISI 347 austenitic stainless steel

Constitutive Models for the Strain Strengthening of Austenitic Stainless Steels at Cryogenic Temperatures with a Literature Review

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