Improvement of mechanical properties on metastable stainless steels by reversion heat treatments

Mateo, A.; Zapata, A; Fargas, Gemma

doi:10.1088/1757-899x/48/1/012001

Cited by 7 publications

(8 citation statements)

References 7 publications

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“…In metastable ASSs DIM forms during tensile testing and also during fatigue loading. Hard martensite in the soft austenitic matrix is known to improve fatigue strength; e.g., [60,64,98,[186][187][188][189][190][191][192]. The cyclic deformation-induced martensitic transformation depends on the temperature, total strain amplitude and the cumulated plastic strain [186], and significantly on GS as pointed out in the previous section.…”

Section: Cyclic Stabilitymentioning

confidence: 92%

“…Promisingly, for instance for a 301LN ASS, cold rolling reductions as low as 35% to 52% seem to result in excellent strength-ductility combinations (see Table 2 in Section 5.1), even though the GS refinement is not most efficient and the GS obtained is not uniform [23,29]. Even very low reductions such as 10% to 40% have been reported to reduce significantly the average GS in 301LN during complete reversion [60,64].…”

Section: Cold Rolling Stagementioning

confidence: 99%

“…The effect of the GS refinement on fatigue strength has been studied extensively in nano-structured materials and also in metastable ASSs [43,60,64,74,87,[180][181][182][183][184][185][186][187][188][189][190][191][192][193][194][195][196]. GS can be refined by various means in addition to the reversion, too.…”

Section: Fatigue Strengthmentioning

confidence: 99%

“…Topic et al [191] showed that in a 304 ASS (coarse-grained condition), pre-formed DIM is beneficial for fatigue life if its fraction is below 20%. Mateo et al [60,190] found that even a 28% DIM fraction did not impair fatigue strength and Fargas et al [64] reported a clear improvement even with a 38% DIM fraction (obtained by 40% reduction of a coarse-grained annealed sample) in cold rolled specimens.…”

Section: Cyclic Stabilitymentioning

confidence: 99%

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Processing and Properties of Reversion-Treated Austenitic Stainless Steels

Järvenpää

Jaskari

Kisko

et al. 2020

Metals

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Strength properties of annealed austenitic stainless steels are relatively low and therefore improvements are desired for constructional applications. The reversion of deformation induced martensite to fine-grained austenite has been found to be an efficient method to increase significantly the yield strength of metastable austenitic stainless steels without impairing much their ductility. Research has been conducted during thirty years in many research groups so that the features of the reversion process and enhanced properties are reported in numerous papers. This review covers the main variables and phenomena during the reversion processing and lists the static and dynamic mechanical properties obtained in laboratory experiments, highlighting them to exceed those of temper rolled sheets. Moreover, formability, weldability and corrosion resistant aspects are discussed and finally the advantage of refined grain structure for medical applications is stated. The reversion process has been utilized industrially in a very limited extent, but apparently, it could provide a feasible processing route for strengthened austenitic stainless steels.

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Section: Cyclic Stabilitymentioning

confidence: 92%

Section: Cold Rolling Stagementioning

confidence: 99%

Section: Fatigue Strengthmentioning

confidence: 99%

Section: Cyclic Stabilitymentioning

confidence: 99%

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Processing and Properties of Reversion-Treated Austenitic Stainless Steels

Järvenpää

Jaskari

Kisko

et al. 2020

Metals

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“…높은 온도에서는 결정립이 성장하여 균질한 조직이 된다 [7,8]. 또한 냉간압연 공정 후 압연 방향에 의한 재료의 원 하지 않은 이방적인 특성이 발생하기 때문에 냉간압연 후 열처리를 통해 이방성을 줄이고 결정립 미세화를 통해 기 계적 특성을 향상 시킬 수 있어 매우 효과적이다 [9][10][11].…”

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Influence of Heat Treatment on Mechanical Properties for Cold Worked 304 Austenitic Stainless Steel

Park¹,

Kim²,

Jang³

et al. 2018

Korean J. Met. Mater.

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Austenitic stainless steels are widely used in a variety of industries, such as power plants, aerospace, automotive, construction and electronics, due to their excellent mechanical properties including ductility, toughness and corrosion resistance. For application in various industries, many parts and products require plastic processes such as cold rolling, cold forging and bending. These processes cause a phenomenon in which the strength is increased but the toughness is lowered by the plastic deformation. However, heat treatment of the plastic-deformed material can improve mechanical properties by grain refinement due to recrystallization and phase transformation. In this study, the effect of grain refinement and phase transformation by heat treatment of cold-worked austenitic stainless steels were evaluated in order to improve mechanical properties such as toughness and strength. After the cold working process, strength and hardness were increased by the phase transformation of martensite from austenite, and an increase in dislocations by plastic deformation. After heat treatment, the ductility and toughness of the austenitic stainless steels strengthened by cold working process were increased due to grain refinement caused by recrystallization of the remaining austenite, and the reverse transformation from martensite to austenite induced by heat treatment.

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Quantitative assessment of structural and compositional colors induced by femtosecond laser: A case study on 301LN stainless steel surface

Shi

Huang

Laakso

et al. 2019

Applied Surface Science

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The topic of durable coloration and passivation of metal surfaces using state-of-theart techniques has gained enormous attention and devotion with unremitting efforts of researchers worldwide. Although femtosecond laser marking has been performed on many metals, the related coloration mechanisms are mainly referred to structural colors produced by the interaction of visible light with periodic surface structures. Yet, general quantitative determination of the resulting colors and their origins remain elusive. In this work, we realized quantitative separations of structural colors and compositional pigmentary colors on 301LN austenitic stainless steel surfaces that were treated by femtosecond laser machining. The overall color information was extracted from surface reflectance, with structural color given by numerical simulations, and oxide compositions by chemical state analysis. It was shown that the laser-induced apparent colors of 301LN steel surfaces were combinations of structural and compositional colorations, with the former dominating the angular response and the latter setting up the brownish bases. In addition to the quantification of colors, the analysis method in this work may be useful for the generation and specification of tailored color palettes for practical coloration on metal surfaces by femtosecond laser marking.

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Improvement of mechanical properties on metastable stainless steels by reversion heat treatments

Cited by 7 publications

References 7 publications

Processing and Properties of Reversion-Treated Austenitic Stainless Steels

Processing and Properties of Reversion-Treated Austenitic Stainless Steels

Influence of Heat Treatment on Mechanical Properties for Cold Worked 304 Austenitic Stainless Steel

Quantitative assessment of structural and compositional colors induced by femtosecond laser: A case study on 301LN stainless steel surface

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