Correlation Between Microstructure and Mechanical Properties Before and After Reversion of Metastable Austenitic Stainless Steels

Fargas, Gemma; Zapata, A; Roa, J.J.; Sapezanskaia, Ina; Mateo, A.

doi:10.1007/s11661-015-3178-8

Cited by 20 publications

(32 citation statements)

References 59 publications

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“…Moreover, this layer only appears at the wear track, whereas there are no indications of ultrafine-grains outside the track, as evidenced in Figure 8d. The formation of this layer due to plastic deformation is in agreement with a previous study carried out by the authors [20] where the cross-section analysis of shot peened specimens of the same here studied stainless steel conditions revealed the formation of an ultrafine-grain layer of 0.5 to 1 μm of thickness. These observations are also corroborated by several studies which describe that severe plastic deformation (SPD)…”

Section: Figure 7 A) Location Of the Regions Studied By Fib: The Edgsupporting

confidence: 92%

“…The most widely accepted interpretation [36,37,38,39] is that not only the total amount of induced martensite is significant, but also the rate of transformation for a given plastic strain and at which point it takes place, are the factors that govern the ductility. In this sense, our previous study [20] showed that for cold rolled specimens martensite transformation occurs rapidly in comparison with the same situation for annealed specimens, resulting in abrupt work hardening and, consequently, premature fracture. Considering the foregoing, it seems clear that plowing volume of 20CR and 40CR specimens decreases progressively as increasing sliding distance.…”

Section: Figure 4 Amount Of Martensite Considering the Initial Percementioning

confidence: 69%

“…The experimental material was a commercial AISI 301 LN austenitic stainless steel elsewhere [20] and also summarized in Table 1. For wear tests, specimens were polished up to roughness values lower than R a = 0.7 m, following the guidelines of ASTM G99 standard [31].…”

Section: Experimental Processmentioning

confidence: 99%

“…Numerous investigations have shown that pre-existing martensite enhance mechanical properties [14,15,16,17,18,19,20]. In this sense, the higher the percentage of martensite, the higher the values of yield stress, ultimate strength, and hardness.…”

Section: Introductionmentioning

confidence: 99%

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Influence of pre-existing martensite on the wear resistance of metastable austenitic stainless steels

Fargas

Roa

Mateo

2016

Wear

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The effect of pre-existing martensite on the sliding wear behaviour of a commercial metastable austenitic stainless steel was investigated. Two different steel conditions were considered: annealed (with a fully austenitic microstructure) and cold rolled, consisting of mixtures of austenite and martensite. Wear tests were carried out using ball on disc technique at constant velocity and different sliding distances. Correlation between microstructure and wear mechanisms was performed by X-ray diffraction, electron back-scattered diffraction and focus ion beam. Results show that wear resistance decrease at increasing the amount of pre-existing martensite. In this sense, the strain-induced martensite developed at higher degree for cold rolled samples which strengths the surface and consequently reduces plowing wear mechanism, typical of ductile abrasive wear. The detailed analysis of the wear track demonstrated the formation of ultrafine-grains layer just below the surface not only for annealed but also for cold rolled steel conditions. For both cases, the main wear mechanism developed for the studied sliding distances was tribocorrosion. WEAR Confirmation of AuthorshipPlease save a copy of this MS Word file, complete and upload as the "Confirmation of Authorship" file.As corresponding author, I Gemma Fargas, hereby confirm on behalf of all authors that:1) The authors have obtained the necessary authority for publication.2) The paper has not been published previously, that it is not under consideration for publication elsewhere, and that if accepted it will not be published elsewhere in the same form, in English or in any other language, without the written consent of the publisher. 3) The paper does not contain material which has been published previously, by the current authors or by others, of which the source is not explicitly cited in the paper.Upon acceptance of an article by the journal, the author(s) will be asked to transfer the copyright of the article to the publisher. This transfer will ensure the widest possible dissemination of information. AbstractThe effect of pre-existing martensite on the sliding wear behaviour of a commercial metastable austenitic stainless steel was investigated. Two different steel conditions were considered: annealed (with a fully austenitic microstructure) and cold rolled, consisting of mixtures of austenite and martensite. Wear tests were carried out using ball on disc technique at constant velocity and different sliding distances. Correlation between microstructure and wear mechanisms was performed by X-ray diffraction, electron back-scattered diffraction and focus ion beam. Results show that wear resistance decrease at increasing the amount of pre-existing martensite. In this sense, the strain-induced martensite developed at higher degree for cold rolled samples which strengths the surface and consequently reduces plowing wear mechanism, typical of ductile abrasive wear. The detailed analysis of the wear track demonstrated the formation of ultrafine-grains layer ...

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Section: Figure 7 A) Location Of the Regions Studied By Fib: The Edgsupporting

confidence: 92%

Section: Figure 4 Amount Of Martensite Considering the Initial Percementioning

confidence: 69%

Section: Experimental Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of pre-existing martensite on the wear resistance of metastable austenitic stainless steels

Fargas

Roa

Mateo

2016

Wear

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“…The effect of grain size on the mechanical properties of ASSs has been studied so far . Misra et al studied the mechanical behavior of AISI 301LN austenitic steel with grain sizes in the range of 0.6 to 1.6 μm.…”

Section: Introductionmentioning

confidence: 99%

Effects of Grain Size on Mechanical Properties and Work‐Hardening Behavior of AISI 304 Austenitic Stainless Steel

Naghizadeh

Mirzadeh

2019

steel research int.

120

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Grain size effects on the properties of AISI 304 austenitic stainless steel are studied. Yield stress (YS) and ultimate tensile strength (UTS) increased with decreasing grain size (Hall–Petch law) while the difference between YS and UTS decreased. Three distinct stages for work‐hardening rate are identified: I) initial rapid fall until reaching a minimum value, II) subsequent rise to a maximum due to the transformation‐induced plasticity (TRIP) effect, which is found to enhance by increasing grain size, and III) final fall until the onset of necking. More in‐depth analysis on the mechanical stability of austenite reveals that for below‐average grain size of ≈50 μm, by decreasing grain size, the TRIP effect diminishes; whereas for grain size larger than ≈50 μm, by increasing grain size, the TRIP effect becomes less pronounced. Due to the strong TRIP effect, high incremental work‐hardening exponents (n‐values of higher than 0.8) and low‐yield ratios (smaller than 0.5) are observed. It is also found that when the average grain size increases, the tensile toughness and the size and depth of dimples increase. The latter is responsible for the tardiness of the microcavity coalescence, which is indicative of high ductility of this austenitic alloy.

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Dilatometric Study of Continuous Annealing of a Cold‐Rolled Austenitic Stainless Steel

Hayoune,

Maredj,

Fajoui

et al. 2023

steel research int.

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The sequence of structural changes produced in two deformed microstructures of austenitic stainless steel elaborated by a multipass unidirectional cold rolling (CR) and a two‐step one, to a 75% thickness reduction, is followed by dilatometric experiments. The two materials show different dilatometric behaviors. X‐ray diffraction and microhardness measurements are performed to underlie the observed dilatometric behaviors. The material subjected to multipass unidirectional CR shows an unusual dilatometric behavior. The first heating stage leads to the occurrence of the recovery reaction in competition with the ε‐martensite reversion. When the temperature increases between 550 and 780 °C, the reversion of deformation‐induced α‐martensite takes place and leads to a complicated dilatometric anomaly. Further increase in temperature leads to the occurrence of the recrystallization transformation. However, the material subjected to two‐step CR shows a quite usual dilatometric behavior which is explained by the occurrence of several reactions in the following order: 1) T < 300 °C, the recovery reaction, 2) 300 < T < 680 °C, the ferro‐ to paramagnetic transformation of α‐martensite, the reversion of ε‐martensite, and the athermal reversion of α‐martensite, 3) 680 < T < 760 °C, thermal reversion of DIM, and then 4) at T > 760 °C, the recrystallization.

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Correlation Between Microstructure and Mechanical Properties Before and After Reversion of Metastable Austenitic Stainless Steels

Cited by 20 publications

References 59 publications

Influence of pre-existing martensite on the wear resistance of metastable austenitic stainless steels

Influence of pre-existing martensite on the wear resistance of metastable austenitic stainless steels

Effects of Grain Size on Mechanical Properties and Work‐Hardening Behavior of AISI 304 Austenitic Stainless Steel

Dilatometric Study of Continuous Annealing of a Cold‐Rolled Austenitic Stainless Steel

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