Rolling tuning microstructure and tensile properties of nano/microcrystalline 304 stainless steel

The effect of rolling parameters on microstructure and tensile properties of nanocrystalline/microcrystalline 304 stainless steel (SS) casted by the aluminothermic reaction was investigated in this work. It was found that majority of the nanocrystalline austenite of the 304 SS rolled at 700[Formula: see text]C and 900[Formula: see text]C grew up and transformed to sub-microcrystalline. While the nanocrystalline/microcrystalline structure still retained rolled at 900[Formula: see text]C with 40% deformation followed 600[Formula: see text]C with 70% thickness reduction, and microcrystalline austenite grains distributed evenly. The strength and ductility of the various rolled 304 SS were improved compared with the as-casted 304 SS steel. The steel rolled at 900[Formula: see text]C with 80% deformation exhibited a uniform elongation as large as 31.3%, which is almost the same ductility level of counterpart coarse-grained steel. The rolled steel at 700[Formula: see text]C with 80% deformation achieved the maximum tensile strength but the smallest elongation. The sample, two-step rolled at 900[Formula: see text]C with 40% thickness reduction and then 600[Formula: see text]C with 70% thickness reduction, yielded the satisfactory combination of strength and ductility. The yield strength and elongation were appropriate 767 MPa and 22.8%, respectively, which resulted from the optimized nanocrystalline/microcrystalline structure and distribution.

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Superior Strength and Ductility of 304 Austenitic Stainless Steel with Gradient Dislocations

Nanomaterials ◽

10.3390/nano11102613 ◽

2021 ◽

Vol 11 (10) ◽

pp. 2613

Author(s):

Qingsong Pan ◽

Song Guo ◽

Fang Cui ◽

Lijun Jing ◽

Lei Lu

Keyword(s):

Stainless Steel ◽

Mechanical Performance ◽

Uniform Elongation ◽

Deformation Mechanisms ◽

Coarse Grained ◽

304 Stainless Steel ◽

Deformation Twins ◽

304 Austenitic Stainless Steel ◽

Multiple Deformation ◽

Strength And Ductility

Materials with designed gradient nanograins exhibit unprecedented mechanical properties, such as superior strength and ductility. In this study, a heterostructured 304 stainless steel with solely gradient dislocation structure (GDS) in micron-sized grains produced by cyclic-torsion processing was demonstrated to exhibit a substantially improved yield strength with slightly reduced uniform elongation, compared with its coarse grained counterparts. Microstructural observations reveal that multiple deformation mechanisms, associated with the formation of dense dislocation patterns, deformation twins and martensitic phase, are activated upon straining and contribute to the delocalized plastic deformation and the superior mechanical performance of the GDS 304 stainless steel.

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High Strain Rate Tensile Properties of AISI Type 304 Stainless Steel

Journal of Engineering Materials and Technology ◽

10.1115/1.3443147 ◽

1973 ◽

Vol 95 (3) ◽

pp. 182-185 ◽

Cited By ~ 8

Author(s):

J. M. Steichen

Keyword(s):

Stainless Steel ◽

High Strain Rate ◽

Strain Rate ◽

Tensile Properties ◽

High Strain ◽

304 Stainless Steel ◽

Aisi Type ◽

Type 304 ◽

Type 304 Stainless Steel ◽

Strength And Ductility

The high strain rate tensile properties of solution annealed Type 304 stainless steel have been determined experimentally. Tests were performed at strain rates ranging from 3 × 10−5 to 1 × 102 in./in./sec at temperatures from 600 to 1600 deg F. At temperatures to 1000 deg F, the strength and ductility are largely insensitive to variations in strain rate, whereas at temperatures from 1200 to 1600 deg F, significant increases in both strength and ductility are observed with increasing strain rate.

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Effect of multiple warm rolling on microstructure and mechanical properties of 304 stainless steel prepared by aluminothermic reaction

Advances in Mechanical Engineering ◽

10.1177/1687814019850998 ◽

2020 ◽

Vol 12 (5) ◽

pp. 168781401985099 ◽

Cited By ~ 1

Author(s):

H Abdelrahim ◽

HB Mohamed ◽

Peiqing La ◽

Wei Fuma ◽

Fuling Ma ◽

...

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Stainless Steel ◽

Yield Strength ◽

Stainless Steels ◽

Warm Rolling ◽

Thickness Reduction ◽

304 Stainless Steel ◽

Reaction Method ◽

Aluminothermic Reaction

304 stainless steels were prepared by aluminothermic reaction method; first steels are annealed at 1000°C and then rolled at 700°C for different deformation. The microstructures evolution and mechanical properties were distinguished in details. It was found that the steel contains nanocrystalline/submicrocrystalline/microcrystalline austenite and submicrocrystalline ferrite. After rolling to a thickness reduction of 30%, 50%, and 70%, the mechanical properties of the rolled steels were substantially increased, as the deformation increased from 30% to 50%, the tensile strength increased from 650 to 1110 MPa, the yield strength increased from 400 to 665 MPa, and the elongation increased from 8% to 8.5%.

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A correlation between the hot-hardness and the hot-tensile properties of AISI 304 stainless steel

Metallurgical and Materials Transactions B ◽

10.1007/bf02642964 ◽

1974 ◽

Vol 5 (1) ◽

Author(s):

John Moteff ◽

Paul R. Sieber

Keyword(s):

Stainless Steel ◽

Tensile Properties ◽

304 Stainless Steel ◽

Aisi 304 Stainless Steel ◽

Aisi 304 ◽

Hot Hardness

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Effect of Ultrasonic Impact Treatment on the Stress Corrosion Cracking of 304 Stainless Steel Welded Joints

Volume 5: High Pressure Technology; Nondestructive Evaluation Division; Student Paper Competition ◽

10.1115/pvp2008-61079 ◽

2008 ◽

Author(s):

Gang Ma ◽

Xiang Ling

Keyword(s):

Residual Stress ◽

Finite Element ◽

Stainless Steel ◽

Stress Corrosion ◽

Stress Corrosion Cracking ◽

Welded Joints ◽

Corrosion Cracking ◽

Coarse Grained ◽

304 Stainless Steel ◽

Ultrasonic Impact Treatment

High tensile weld residual stress is an important factor contributing to stress corrosion cracking (SCC). Ultrasonic impact treatment (UIT) can produce compressive stresses on the surface of welded joints that negate the tensile stresses to enhance the SCC resistance of welded joints. In the present work, X-ray diffraction method was used to obtain the distribution of residual stress induced by UIT. The results showed that UIT could cause a large compressive residual stress up to 325.9MPa on the surface of the material. A 3D finite element model was established to simulate the UIT process by using a finite element software ABAQUS. The residual stress distribution of the AISI 304 stainless steel induced by UIT was predicted by finite element analysis. In order to demonstrate the improvement of the SCC resistance of the welded joints, the specimens were immersed in boiling 42% magnesium chloride solution during SCC testing, and untreated specimen cracked after immersion for 23 hours. In contrast, treated specimens with different coverage were tested for 1000 hours without visible stress corrosion cracks. The microstructure observation results revealed that a hardened layer was formed on the surface and the initial coarse-grained structure in the surface was refined into ultrafine grains. The above results indicate that UIT is an effective approach for protecting weldments against SCC.

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