Effective grain size refinement of an Fe-24Ni-0.3C metastable austenitic steel by a modified two-step cold rolling and annealing process utilizing the deformation-induced martensitic transformation and its reverse transformation

Mao, Wenqi; Gao, Si; Bai, Yu; Park, Myeong-heom; Shibata, Akinobu; Tsuji, Nobuhiro

doi:10.1016/j.jmrt.2022.02.031

Cited by 23 publications

(15 citation statements)

References 51 publications

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“…Therefore, it is a great importance to control the size of the partially reverted globular austenite. It was reported that, the fully transformed austenite grain size can be refined by cyclic reversion treatment from martensite 1,2) , or cold rolling of the matrix before reversion 2,[4][5][6] . However, rare attention has been paid to refine the partially reverted austenite and the way to refine the partially reverted austenite is unclear yet.…”

Section: Methodsmentioning

confidence: 99%

“…The final structure and mechanical properties of steels are strongly depended on the reverted austenite structures. Austenite reversion from martensite has been initially used for grain refinement [1][2][3][4][5][6] or as a key process for tailoring the structure and properties of advanced high strength steels in recent years [7][8][9][10][11][12][13][14][15] , for example the TM (tempered martensite)-TRIP (TRIP steel with TM matrix) 13,14) or TM-Q&P steel 9,10,15) .…”

Section: Introductionmentioning

confidence: 99%

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A Novel Way Refining the Partially Reverted Globular Austenite in Reversion from Martensite

et al. 2023

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Refining of the partially reverted globular austenite grain is of great importance to obtain high mechanical property of advanced high strength steels and a new approach for such refining, pretempering of initial martensite, is proposed in this study. The pre-tempering results in precipitation of the coarse and alloying-elements partitioned cementite particles in an Fe-2.5Mn-1.5Si-0.35C alloy. The cementite particles with Mn and Si partitioning enhanced the nucleation of globular austenite grains but suppressed its growth during continuous heating. The enhancement in nucleation and restriction in growth of globular austenite resulted in the refinement of partially reverted globular austenite grains and fully transformed austenite grains after reversion. This provides a new strategy to control the growth of partially reverted globular austenite by tailoring coarse and partitioned cementite particles.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Novel Way Refining the Partially Reverted Globular Austenite in Reversion from Martensite

et al. 2023

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“…[4][5][6][7][8][9] However, they exhibit quite low yield strength derived from the coarse γ-austenite (face-centered cubic [FCC]) phase. [9][10][11][12] According to several studies conducted in this research area, the yield strengthening of ASSs can be reached through severe plastic deformation (SPD) methods [6,[11][12][13] via the activation of various strengthening mechanisms, such as grain refining, transformation strengthening, and work hardening. However, these methods are very limited by the fact that mass production of high strength materials is very difficult.…”

Section: Introductionmentioning

confidence: 99%

“…[6,11,13] Therefore, conventional metalworking techniques, where one or more dimensions of the work piece are continuously reduced under processing, can be used instead of complicated SPD methods. [12,13] Furthermore, it has also been reported that ultrafine grained (UFG) ASSs can be fabricated by conventional rolling and annealing processes. [4][5][6][7]9,[11][12][13][14][15][16][17] The principle is to use cold rolling (CR) to produce DIM and the subsequent annealing to revert the DIM back to nano-or ultrafinegrained austenite under specific conditions.…”

Section: Introductionmentioning

confidence: 99%

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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“…The mechanical properties of rolled samples did not show obvious directivity. Mao et al [ 10 ] deeply optimized the cold rolling process of Fe–24Ni–0.3C austenitic steel, and fully induced martensitic transformation by plastic deformation to achieve the effect of grain refinement. Through the combined process of cold rolling and annealing, the difficult difficulty of induced martensitic transformation in the high stability of austenite was successfully overcome.…”

Section: Introductionmentioning

confidence: 99%

Effect of Rolling on Microstructure Evolution and Plastic Deformation Behavior of A473M Martensitic Stainless Steel

Wang

Zhang

Wang

et al. 2022

steel research int.

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Herein, the surface of A473M martensitic stainless steel is strengthened by rolling processing technology. The microstructure evolution and plastic deformation behavior are characterized by electron backscatter diffraction (EBSD). The experimental results indicate that residual compressive stress will be formed on the surface of A473M steel after rolling, and the maximum value can reach 946 MPa. The surface roughness decreases significantly from 383 to 62.7 nm, which is only 1/5 of the matrix. The microstructure of the rolled samples is obviously refined, and <101>//ND texture is formed. The nanohardness of the hardened layer on the sample surface increases from 2.5 to 4.8 GPa, and the elastic modulus increases from 140 to 217 GPa. Compared with the matrix, the tensile strength and yield strength after rolling are increased by 40% and 22%, respectively. EBSD analysis indicates that the texture of the rolled samples after tensile changed from the <101>//TD direction of the matrix to the <101>//TD and <111>//RD directions.

show abstract

Effective grain size refinement of an Fe-24Ni-0.3C metastable austenitic steel by a modified two-step cold rolling and annealing process utilizing the deformation-induced martensitic transformation and its reverse transformation

Cited by 23 publications

References 51 publications

A Novel Way Refining the Partially Reverted Globular Austenite in Reversion from Martensite

A Novel Way Refining the Partially Reverted Globular Austenite in Reversion from Martensite

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

Effect of Rolling on Microstructure Evolution and Plastic Deformation Behavior of A473M Martensitic Stainless Steel

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