Strengthening of Metastable 16-10 Austenitic Stainless Steel by Ultra Grain Refining

Takaki, Setsuo; Tanimoto, Seiji; Tomimura, Kouki; Tokunaga, Youichi

doi:10.2355/tetsutohagane1955.74.6_1058

Cited by 20 publications

(4 citation statements)

References 5 publications

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“…The

Δ G^{α - γ}

of Fe–Cr–Ni alloys, which is calculated from a regular solution model, is determined by Equation

Δ G^{α - γ} = \sum normalΔ G_{i}^{normalα - normalγ} + \sum Ω_{i j}^{normalα - normalγ} X_{i} X_{j}

where

Δ G^{α - γ}

is the difference in free energy between the α and γ phases in pure metal ( i ),

{normalΩ}_{i j}^{α - γ}

is the difference in interaction parameter between α and γ phases in the i – j binary system and X is the atomic fraction. Using thermodynamic data reported by S. Takaki et al, the Equation can be derived for the ternary Fe–Cr–Ni system steels by

\begin{matrix} left \\ Δ G^{α - γ} (J mo {normall}^{- 1}) = 10^{- 2} Δ G_{Fe}^{α - γ} (100 - Cr - Ni) - 97.5 Cr + 2.02 C {normalr}^{2} - 108.8 Ni + 0.52 N {normali}^{2} \\ \begin{array}{c} center & \begin{array}{c} center \end{array} \end{array} - 0.05 CrNi + 10^{- 3} T (73.3 Cr - 0.67 C {normalr}^{2} + 50.2 Ni - 0.84 N {normali}^{2} - 1.51 CrNi) \end{matrix}

where T is the tempering temperature (K) and Ni and Cr in this equ...…”

Section: Resultsmentioning

confidence: 99%

Reverse Transformation Mechanism of Martensite to Austenite in 00Cr15Ni7Mo2WCu2 Super Martensitic Stainless Steel

Jiang

et al. 2014

steel research int.

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The reverse transformation mechanism of martensite to austenite in 00Cr15Ni7Mo2WCu2 super martensitic stainless steel has been studied. The experimental results indicated that the volume fraction of reversed austenite in 00Cr15Ni7Mo2WCu2 super martensitic stainless steel increased first and then decreased with increasing tempering temperature over a range of 550–750 °C after quenching at 1050 °C. The reversed austenite formed along the martensite lath boundaries. When the tempering temperature was below 700 °C, the reversed austenite grew with a Ni‐enrichment; when the temperature was above 700 °C, the reversed austenite re‐dissolved and transformed to martensite and a part of the reversed austenite divided the original wider martensitic laths into a number of thinner ones. The basic mechanism for formation of the reversed austenite is diffusion in 00Cr15Ni7Mo2WCu2 super martensitic stainless steel.

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“…The

Δ G^{α - γ}

of Fe–Cr–Ni alloys, which is calculated from a regular solution model, is determined by Equation

Δ G^{α - γ} = \sum normalΔ G_{i}^{normalα - normalγ} + \sum Ω_{i j}^{normalα - normalγ} X_{i} X_{j}

where

Δ G^{α - γ}

is the difference in free energy between the α and γ phases in pure metal ( i ),

{normalΩ}_{i j}^{α - γ}

\begin{matrix} left \\ Δ G^{α - γ} (J mo {normall}^{- 1}) = 10^{- 2} Δ G_{Fe}^{α - γ} (100 - Cr - Ni) - 97.5 Cr + 2.02 C {normalr}^{2} - 108.8 Ni + 0.52 N {normali}^{2} \\ \begin{array}{c} center & \begin{array}{c} center \end{array} \end{array} - 0.05 CrNi + 10^{- 3} T (73.3 Cr - 0.67 C {normalr}^{2} + 50.2 Ni - 0.84 N {normali}^{2} - 1.51 CrNi) \end{matrix}

where T is the tempering temperature (K) and Ni and Cr in this equ...…”

Section: Resultsmentioning

confidence: 99%

Reverse Transformation Mechanism of Martensite to Austenite in 00Cr15Ni7Mo2WCu2 Super Martensitic Stainless Steel

Jiang

et al. 2014

steel research int.

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“…[1,2] Despite of possessing superior mechanical properties, austenitic stainless steels are still suffering from a host of problems like low yield strength discouraging the usage of this steel in structural applications. [6][7][8][9][10][11] The key point in grain refinement of ASSs is producing a higher amount of deformation-induced martensite. [4,5] Strengthening by grain refinement is more desirable, because grain refinement improves the yield strength while providing a reasonable ductility.…”

Section: Introductionmentioning

confidence: 99%

A Significant Improvement in the Mechanical Properties of AISI 304 Stainless Steel by a Combined RCSR and Annealing Process

et al. 2016

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The effect of a new severe plastic deformation method, "repetitive corrugation and straightening by rolling (RCSR)" on AISI 304 stainless steel is investigated. A thermo-mechanical treatment based on the reversion of a 0 -martensite is applied to produce fine-grained structure. Microstructural characterizations are conducted by X-ray diffraction and electron backscattered diffraction. Mechanical properties are investigated by measuring uniaxial tensile properties. It is found that the amount of strain-induced martensite increases monotonically with increasing of applied strain, yielding up to 90 vol% of martensite after 30 cycles of the RCSR process. By applying a subsequent annealing, austenite grain size is decreased considerably, which leads to substantial strengthening.

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“…Grain refinement can be accomplished in an industrial scale utilizing thermomechanical processing, which involves multistage deformation and annealing processes which are optimized to achieve the most effective condition [3]. In this regards, Takaki et al suggested a new thermomechanical method based on heavy cold rolling and subsequent annealing (called martensite process) to obtain nano/submicron austenite grain size [4]. The formation of deformation induced martensite is closely related to shear bands produced in the rolling process.…”

Section: Introductionmentioning

confidence: 99%

Study on the Wear Behavior of Ultrafine Grained 304L Stainless Steel

Dehsorkhi

Sabooni

Karimzadeh

et al. 2013

AMR

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An ultrafine grained 304L stainless steel with average grain size of 650±100 nm was produced by a combination of cold rolling and annealing. Wear behavior of the steel was examined by dry sliding wear tests under different loads. Different microstructural characterizations were conducted on the ultrafine grained structure after thermomechanical processing and wear tests. The results demonstrated that the steel had yield strength of 720 MPa and total elongation of 47%, which is almost twice higher than typical coarse grained strength. Also, wear tests results showed a good linear relation between the cumulative wear loss and distance in each normal load. Wear rate was about 0.024, 0.043 and 0.093 mg/m for normal loads of 10, 20 and 30N, respectively. Wear mechanism was also recognized as delamination (in the early stage) and mixture of delamination and abrasion in higher distances.

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Strengthening of Metastable 16-10 Austenitic Stainless Steel by Ultra Grain Refining

Cited by 20 publications

References 5 publications

Reverse Transformation Mechanism of Martensite to Austenite in 00Cr15Ni7Mo2WCu2 Super Martensitic Stainless Steel

Reverse Transformation Mechanism of Martensite to Austenite in 00Cr15Ni7Mo2WCu2 Super Martensitic Stainless Steel

A Significant Improvement in the Mechanical Properties of AISI 304 Stainless Steel by a Combined RCSR and Annealing Process

Study on the Wear Behavior of Ultrafine Grained 304L Stainless Steel

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