Deformation mechanism and ductile fracture behavior in high strength high ductility nano/ultrafine grained Fe-17Cr-6Ni austenitic steel

Lei, Chengshuai; Li, Xin; Deng, Xiaomin; Wang, Zhaodong; Wang, Guodong

doi:10.1016/j.msea.2017.10.043

Cited by 39 publications

(15 citation statements)

References 48 publications

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“…The choice of proper parameters of this thermomechanical treatment, namely the level of cold deformation and temperature and time of reversion annealing can lead up to ultrafinegrained (UFG) microstructure with an excellent combination of high strength and good ductility -see e.g. [2][3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Cyclic deformation behaviour and stability of grain-refined 301LN austenitic stainless structure

et al. 2018

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Low cycle fatigue (LCF) behaviour of metastable austenitic 301LN stainless steel with different grain sizes – coarse-grained (13 μm), fine-grained (1.4 μm) and ultrafine-grained (0.6 μm) – produced by reversion annealing after prior cold rolling was investigated. Fully symmetrical LCF tests with constant total strain amplitudes of 0.5% and 0.6% were performed at room temperature with a low constant strain rate of 2×10-3 s-1. Microstructural changes in different positions within the gauge part of the specimens were examined by optical microscopy (polarized light) and electron backscatter diffraction (EBSD) technique; for quantitative assessment of the volume fraction of deformation induced martensite (DIM) a Feritscope FMP 30 was adopted. The cyclic stress-strain response and specific changes of hysteresis loop shapes in the very early stage of cycling are confronted with the character of DIM formation and its distribution in the whole volume of the material. A possible effect of strain rate (frequency of cycling) on the destabilization of austenitic structure during cyclic straining of materials with different grain sizes is highlighted.

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Section: Introductionmentioning

confidence: 99%

Cyclic deformation behaviour and stability of grain-refined 301LN austenitic stainless structure

et al. 2018

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“…Ueno et al [9] successfully obtained a bulk nanocrystalline grain structure in a low carbon 316 L stainless steel by means of ECAP at 423 K. They observed a substantial increase of the fatigue limit with values of 570 MPa after 3 ECAP-passes. Furthermore, it is interesting to note that in this study the ratio of fatigue limit to ultimate tensile strength after ECAP is greater than for coarse grain stainless steel, which indicates the best working capacity of the material under cyclic loading Cr-Ni-Ti austenitic stainless steels are meta-stable at room temperature [22][23][24][25]. The strain-induced martensitic transformation may result in so-called transformation-induced plasticity (TRIP) effect and remarkably alter the deformation behavior of the austenitic stainless steels [23][24][25].…”

Section: Introductionmentioning

confidence: 65%

Structural changes in metastable austenitic steel during equal channel angular pressing and subsequent cyclic deformation

Добаткин

Skrotzki

Rybalchenko

et al. 2018

Materials Science and Engineering: A

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The paper reports a substantial improvement of the static and cyclic strength of a Cr-Ni-Ti austenitic stainless steel nanostructured by equal channel angular pressing (ECAP). After ECAP at room temperature or 673 K, the mean grain size decreased from 14 µm to 430 nm or 940 nm, respectively; corresponding ultimate tensile strength increased from 610 MPa to 1230 MPa or 940 MPa, and the fatigue limit increased from 275 MPa to 375 MPa or 475 MPa. These enhanced strength properties result from the grain refinement assisted by the intensive twinning in the austenite during ECAP at room temperature and 673 K as well as partial martensitic transformation during ECAP at room temperature. Moreover, the partial martensitic transformation and an increase in the fraction of high angle grain boundaries during subsequent high-cycle fatigue tests were particularly favorable for the improvement of fatigue properties.

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“…At the third stage, in the majority of the studied microstructure fields of the rod cross section, the block trapezoidal structure is transformed into the equiaxed grain one (Figure 9c), which is probably caused by the rotation of each piece before gaining the equilibrium orientation [31]. In addition, the deformation twins are not detected in the majority of grains, except for the most coarse grains, which is due to the so-called restriction effect [3,32]. In longitudinal section at this stage, the band austenitic-martensitic structure is formed (Figure 9f), which is additionally fragmented with dislocation and interphase borderlines in the transverse direction.…”

Section: Discussionmentioning

confidence: 99%

“…The restriction effect of deformation twins formation caused by the 321 MASS structure refinement was discussed in references [3,32]. Structure refinement reduces the propensity to twinning due to changes in the ratio of stresses related to complete dislocation formation or Shockley partial dislocation, which can be formulated as the expression to define the critical diameter of the FCC-lattice metal grain, in which one strain mechanism is switched with the other [34]:dc=2αμ(b−b1)b1γ, where μ —shear modulus that amounts to 77.4 GPa [2]; b and b 1 —strength of dislocation for complete dislocation and Shockley partial dislocation, which in this case amount to 2.54·10 −10 m and 33·b, respectively [32]; α —Taylor constant taken as equal to 1 [31]; γ—stacking fault energy, which at difference estimates is at the level of 13.2–20.9 mJ/m 2 [26,27,28].…”

Section: Discussionmentioning

confidence: 99%

Metastable Austenitic Steel Structure and Mechanical Properties Evolution in the Process of Cold Radial Forging

Панов

Перцев²,

Смирнов

et al. 2019

Materials

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The article presents the influence of structure formation on the properties of 321 metastable austenitic stainless steel in the process of cold radial forging (CRF). The steel under study after austenitization was subjected to CRF at room temperature with degrees of true strain (e) 0.26, 0.56, 1.00, 1.71 and 2.14. It has been shown that structure formation of the studied steel during CRF consists of three stages: formation of the lamellar structure of austenite, formation of the trapezoidal structure, and formation of the equiaxial grain structure. The kinetics of the strain-induced α’-martensitic transformation is related to the stages of structure evolution. Hardness, ultimate tensile strength and yield strength uniformly increase in all stages of structure formation with a significant decrease of elongation to fracture during the first stage of structure formation while the value of elongation to fracture remains constant in the subsequent stages of deformation. Impact strength of fatigue cracked specimens (KCT) decreases sharply at the first stage of structure formation and smoothly increases at the second and third stages. However, the impact strength of V-notch specimens (KCV) continuously decreases when deformation degree increases in the overall investigated deformation range.

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Deformation mechanism and ductile fracture behavior in high strength high ductility nano/ultrafine grained Fe-17Cr-6Ni austenitic steel

Cited by 39 publications

References 48 publications

Cyclic deformation behaviour and stability of grain-refined 301LN austenitic stainless structure

Cyclic deformation behaviour and stability of grain-refined 301LN austenitic stainless structure

Structural changes in metastable austenitic steel during equal channel angular pressing and subsequent cyclic deformation

Metastable Austenitic Steel Structure and Mechanical Properties Evolution in the Process of Cold Radial Forging

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