Effect of Annealing Temperature on Microstructure and Mechanical Properties of Bulk 316L Stainless Steel with Nano- and Micro-crystalline Dual Phases

Microstructures and mechanical properties of 316L stainless steels with dual phases austenite prepared by an aluminothermic reaction casting were explored. It is found that the steels consist of nano- and micro-crystalline austenite phases, a little δ ferrite and contaminations. Before and after ann...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2014-10, Vol.45 (11), p.5236-5244
Main Authors: La, Peiqing, Wei, Fuan, Lu, Xuefeng, Chu, Chenggang, Wei, Yupeng, Wang, Hongding
Format: Article
Language:English
Subjects:
Annealing
Applied sciences
Austenite
Austenitic stainless steels
Characterization and Evaluation of Materials
Chemistry and Materials Science
Dual phase steels
Duplex stainless steels
Exact sciences and technology
Heat resistant steels
Materials Science
Mechanical properties
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metallic Materials
Metals. Metallurgy
Microstructure
Nanostructure
Nanotechnology
Phases
Stainless steel
Structural Materials
Surfaces and Interfaces
Temperature effects
Thin Films
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Summary:Microstructures and mechanical properties of 316L stainless steels with dual phases austenite prepared by an aluminothermic reaction casting were explored. It is found that the steels consist of nano- and micro-crystalline austenite phases, a little δ ferrite and contaminations. Before and after annealing at 1073 K and 1273 K (800 °C and 1000 °C), average grain sizes of the nanocrystalline austenite phase are about 32, 31, 38 nm, respectively. Tensile strength increases first from 371 to 640 MPa and then decreases to 454 MPa. However, elongation ratio increases gradually from 16 to 23 and then 31 pct after annealing. The results illustrate that the steel after annealing at 1073 K (800 °C) has better properties, also indicating that combination of dual nano- and micro-crystalline austenite phase is conductive to improving tensile properties of materials.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-014-2432-9