The Effects of Cold Work on the Microstructure and Mechanical Properties of Intermetallic Strengthened Alumina-Forming Austenitic Stainless Steels

Hu, Bin; Trotter, Geneva; Baker, I.; Miller, M.K.; Yao, Liang; Chen, S.; Cai, Zhonghou

doi:10.1007/s11661-015-2981-6

Cited by 20 publications

(35 citation statements)

References 27 publications

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“…This paper calls the alloy 'AFA26,' which is similar to the title designated by Yamamoto et al in [18]. AFA26 with the additions of C or B has been studied previously by Hu et al and is referred to as 'AFA29' [19].…”

Section: Introductionmentioning

confidence: 88%

“…The γ/γ' microstructure observed in AFA26 is common in Ni-based superalloys[28]. Analogous to the analysis of AFA29 stainless steel[19] and other alloys that have been strengthened by γ'-Ni 3 (Al,Ti) precipitates[15] the orientation relationship between the γ' phase and the f.c.c. matrix in AFA26 was determined to be cube-on-cube (i.e.…”

mentioning

confidence: 95%

“…The lattice parameter estimates for the γ', f.c.c. matrix, and B2-NiAl in AFA26 are similar to the synchrotron XRD measured values for AFA29 after being aged for 240 h (γ', a = 0.3599 nm, f.c.c., a = 0.3609 nm, B2-NiAl a = 0.2892 nm) [19].…”

mentioning

confidence: 97%

“…It has been observed that when γ' particles have a low misfit (less than 0.5%) they tend to be spherical while at higher misfits they tend to be cuboidal [29]. In an AFA29 sampled annealed for 240 h after a thermomechanical treatment, spherical γ' particles were present with a 0.28% γ/γ' misfit [19].…”

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confidence: 99%

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Precipitation kinetics during aging of an alumina-forming austenitic stainless steel

Trotter

Sun

et al. 2016

Materials Science and Engineering: A

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The microstructural evolution of DAFA26, an alumina-forming austenitic (AFA) stainless steel, was investigated during aging. The effect of aging at 750°C and 800°C on the growth of spherical γ'-Ni 3 (Al, Ti) particles present in the as-processed state was studied extensively using X-ray diffraction, microhardness testing, scanning electron microscopy, transmission electron microscopy, and atom probe tomography. The γ' particles had a cube-on-cube orientation relationship with the matrix (i.e. (m // p , m // p)). The coarsening kinetics of γ'-Ni 3 Al particles were in agreement with the Lifshitz, Slyozof-Wagner theory. Coarse Laves phase particles were also present in the as-processed state, and during the aging process both smaller Laves phase precipitates and B2-NiAl precipitates formed on both the grain boundaries and in the matrix. The γ' precipitates were determined to have the most impact on the room temperature hardness.

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Section: Introductionmentioning

confidence: 88%

mentioning

confidence: 95%

mentioning

confidence: 97%

mentioning

confidence: 99%

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Precipitation kinetics during aging of an alumina-forming austenitic stainless steel

Trotter

Sun

et al. 2016

Materials Science and Engineering: A

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“…These desired properties would position SAS as a favorable candidate for structural applications in different branches of industries, in particular as a corrosion resistant alloy (CRA) in oil and gas ones . In addition, to optimize the properties of any austenitic steel, different thermomechanical processing (TMP) cycles have been proposed to control the final microstructure in terms of grain morphology, crystallographic texture, and mechanical properties . In this regards, the previous researches confirm that the deliberated thermomechanical processing may play an effective role in the modification of microstructural characteristics in different type of austenite steels.…”

Section: Introductionmentioning

confidence: 97%

Microstructural Evolution and Texture Analysis in a Thermomechanically Processed Low SFE Super‐Austenitic Steel (Alloy‐28)

2018

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Microstructural evolution and texture analysis after 80% cold rolling and subsequent annealing in the temperature range of 750-1050 C is surveyed in Alloy-28. This is precisely studied through electron back scattered diffraction and also is declared through elaborating the hardness map. The occurrence of partially recrystallization is clearly evident in the microstructure which was treated 850 C annealing for 30 min. The recrystallization process is completed at 950 C even after 3 min, but in an inhomogeneous manner, that is, coexistence of relatively large and fine recrystallized grains. This microstructure contains a high volume of special grain boundaries ended to the complete and homogenous recrystallization at 1050 C, where further grain growth is occurred with increasing time. Texture analysis shows the retaining of Goss texture after annealing at 850 C and this component is introduced as the main reason for retarding recrystallization and, therefore, creation of inhomogeneous microstructure. Finally, the specimens processed at 1050 C indicate the α-fiber texture due to occurrence of grain growth. The mechanical properties improvement is mainly attributed to the development of S component and also formation of high fraction of annealing twin. Although, predominant the appearance of Goss texture and grain growth are also known as the main reason for deteriorating strength.

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Effects of aluminum additions on the microstructure and mechanical properties of alumina‐forming austenitic stainless steels

Sun,

Liu,

Zhou

et al. 2023

Materialwissenschaft Werkst

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The mechanical properties, including tensile and impact properties at different testing temperatures of alumina‐forming austenitic steels (25 % nickel, 20 % chromium) with different aluminum contents (0, 2.5 %, 5 % and 8 %) were investigated. Scanning and transmission electron microscopy together with tensile and impact properties tests were conducted. The results showed that the tensile strength of steels at 298 K increased obviously along with aluminum contents increasing, while plasticity decreased at the same, which attributed to the higher volume fraction and number density of spherical NiAl precipitation together with main ferrite in matrix. In addition, spherical NiAl particles dispersed easily in ferrite. In particular, the ultimate tensile strength of the sample with 8 % aluminum could reach 1398 MPa, with the elongation of 14 % at 298 K. However, NiAl precipitations would lose strengthening effects at high temperatures, but the plasticity could be improved. In addition, the sample with 5 % aluminum showed better comprehensive properties by comparison to other samples, and the ultimate tensile strength was 1018 MPa and 491 MPa at 298 K and 973 K with the elongation of 26 % and 43 %, respectively, enabling it to be promising material for industrial application in advanced nuclear systems.

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The Effects of Cold Work on the Microstructure and Mechanical Properties of Intermetallic Strengthened Alumina-Forming Austenitic Stainless Steels

Cited by 20 publications

References 27 publications

Precipitation kinetics during aging of an alumina-forming austenitic stainless steel

Precipitation kinetics during aging of an alumina-forming austenitic stainless steel

Microstructural Evolution and Texture Analysis in a Thermomechanically Processed Low SFE Super‐Austenitic Steel (Alloy‐28)

Effects of aluminum additions on the microstructure and mechanical properties of alumina‐forming austenitic stainless steels

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