Microstructure-tensile property correlation in 304 stainless steel after cold deformation and austenite reversion

Mallick, P.; Tewary, N.K.; Ghosh, S. K.; Chattopadhyay, Partha

doi:10.1016/j.msea.2017.09.070

Cited by 30 publications

(7 citation statements)

References 46 publications

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“…The slip bands appear along with the selected directions. Similar observations were presented in [ 19 , 27 , 28 , 29 ]. Subsequently, microstructural studies were carried out for selected configurations of the B-type samples.…”

Section: Appendix A1 Experimental Investigation On the Influence Of I...supporting

confidence: 90%

“…The slip bands appear along with the selected directions. Similar observations were presented in [ 19 , 27 , 28 , 29 ].…”

Section: Appendix A1 Experimental Investigation On the Influence Of I...supporting

confidence: 90%

“…Stainless austenitic and ferritic austenitic steels, when plastic deformed, show an interesting combination of high strength and formability, making it possible to reduce the weight of the parts. The mechanical properties of AISI 304L can be improved if the stainless steel is cold-formed before basic forming [ 25 , 26 , 27 , 28 ]. This property makes the material well suited for the production of roll-formed profiles to reduce the weight of the structures they are used in.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Initial Predeformation on the Plastic Properties of Rolled Sheets of AISI 304L Austenitic Steel

Szusta

Zubelewicz

2022

Materials

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This paper presents research on the influence of material anisotropy caused by the technological process of its manufacturing on the plastic properties of the material. In the experimental study, samples cut from an AISI 304L rolled sheet in the rolling direction, transverse, and at a 45° angle to the rolling direction were predeformed by axial deformation at 18 and 30%. The principal specimens extracted from the pre-deformed plates, cut in the longitudinal, transverse, and 45° angle directions, were subjected to tensile loading until failure. The data thus obtained allowed for the analysis of the plastic flow mechanism using the author’s calculation procedure. The CR coefficient analysis provided information on the state of plastic anisotropy caused by the pre-deformation. For the specimens predeformed in the rolling direction, plastic flow isotropy was observed at a strain of 35%. For the specimens predeformed in the transverse direction—the plastic anisotropy is completely removed at a strain of 33%. For the specimens predeformed at 45 degrees to the rolling direction, it was found that the strain completely removed the plastic anisotropy induced by rolling. The calculations provided information that due to an abrupt change in the strain path, a strong reconfiguration of the plastic flow mechanism occurs, causing the removal of anisotropy generated by rolling.

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Section: Appendix A1 Experimental Investigation On the Influence Of I...supporting

confidence: 90%

“…The slip bands appear along with the selected directions. Similar observations were presented in [ 19 , 27 , 28 , 29 ].…”

Section: Appendix A1 Experimental Investigation On the Influence Of I...supporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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Effect of Initial Predeformation on the Plastic Properties of Rolled Sheets of AISI 304L Austenitic Steel

Szusta

Zubelewicz

2022

Materials

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“…The mechanical properties of these steels are successfully improved relative to the initial values by plastic deformation and (or) by thermomechanical treatments [4][5][6]. Under conditions of cold plastic deformation in metastable austenitic steels, dislocation gliding is not the only deformation mechanism of plastic deformation; there are also strain-induced γ → ε (face-center-cubic (fcc) → hexagonal-closed-packed (hcp)) and γ → ε → α (fcc → hcp → body-center-cubic (bcc)) martensitic transformations [1,2,5,[7][8][9][10][11]. In austenitic steels with low stacking fault (SF) energy under these conditions, a high density of microtwin packets is formed [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Structural Transformations and Mechanical Properties of Metastable Austenitic Steel under High Temperature Thermomechanical Treatment

Litovchenko

Аккузин

Polekhina

et al. 2021

Metals

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The effect of high-temperature thermomechanical treatment on the structural transformations and mechanical properties of metastable austenitic steel of the AISI 321 type is investigated. The features of the grain and defect microstructure of steel were studied by scanning electron microscopy with electron back-scatter diffraction (SEM EBSD) and transmission electron microscopy (TEM). It is shown that in the initial state after solution treatment the average grain size is 18 μm. A high (≈50%) fraction of twin boundaries (annealing twins) was found. In the course of hot (with heating up to 1100 °C) plastic deformation by rolling to moderate strain (e = 1.6, where e is true strain) the grain structure undergoes fragmentation, which gives rise to grain refining (the average grain size is 8 μm). Partial recovery and recrystallization also occur. The fraction of low-angle misorientation boundaries increases up to ≈46%, and that of twin boundaries decreases to ≈25%, compared to the initial state. The yield strength after this treatment reaches up to 477 MPa with elongation-to-failure of 26%. The combination of plastic deformation with heating up to 1100 °C (e = 0.8) and subsequent deformation with heating up to 600 °C (e = 0.7) reduces the average grain size to 1.4 μm and forms submicrocrystalline fragments. The fraction of low-angle misorientation boundaries is ≈60%, and that of twin boundaries is ≈3%. The structural states formed after this treatment provide an increase in the strength properties of steel (yield strength reaches up to 677 MPa) with ductility values of 12%. The mechanisms of plastic deformation and strengthening of metastable austenitic steel under the above high-temperature thermomechanical treatments are discussed.

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“…However, the main problem in these methods is the formation of stain induced martensite, which lowers the ductility . In this connection, it is important to note that reversion of strain induced martensite improves the ductility in the steels processed under aforesaid routes . During reversion, the formation of fine grains and inhomogeneous distribution of these fine grains lead to strain localization causing improvement in the ductility value .…”

Section: Introductionmentioning

confidence: 99%

Effect of TMCP on Microstructure and Mechanical Properties of 304 Stainless Steel

Mallick¹,

Tewary²,

Ghosh³

et al. 2018

steel research int.

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The present study investigates the evolution of microstructure and mechanical properties of 304 stainless steel after thermo‐mechanical controlled processing (TMCP). Three different FRTs (finish rolling temperatures) have been adopted and the micro‐constituents are identified as austenite grains, stacking faults, annealing, and deformation twins. Fine austenite grains in the range of 1–30 μm are obtained at lower FRT (700 °C) whereas at higher FRT, coarse grains are formed. TEM and X‐ray analyses indicate the formation of M23C6 ((Cr, Fe)23C6) precipitates for higher FRT (900 °C). Specimen processed with 700 °C FRT results into 37% enhancement in UTS compared to the base metal which is attributed to fine partially recrystallized grain, extensive deformation twinning and high dislocation density. Maximum elongation (68%) is obtained due to the formation of strain‐free equiaxed grains (≈40 μm) at 900 °C FRT.

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Microstructure-tensile property correlation in 304 stainless steel after cold deformation and austenite reversion

Cited by 30 publications

References 46 publications

Effect of Initial Predeformation on the Plastic Properties of Rolled Sheets of AISI 304L Austenitic Steel

Effect of Initial Predeformation on the Plastic Properties of Rolled Sheets of AISI 304L Austenitic Steel

Structural Transformations and Mechanical Properties of Metastable Austenitic Steel under High Temperature Thermomechanical Treatment

Effect of TMCP on Microstructure and Mechanical Properties of 304 Stainless Steel

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