Mechanical Properties of Ultra-Fine Grained Fe-Cr-Ni Alloy Fabricated by ARB

Taro Maekawa; Hiromoto Kitahara; Nobuhiro Tsuji

doi:10.4028/www.scientific.net/AMR.26-28.413

Paper Titles

The Study of Residual Stresses for Roller Hemmed Aluminum Alloys
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Formability and Mechanical Property of Aluminum Sheets Locally Surface-Modified by the Concept of Surface Friction Joining
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Evolution of Microstructure and Texture of Pure Al Single Crystal Having {112}<110> Orientation during Severe Plastic Deformation
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Characterization of Mg-Al Sheet Clad Materials Fabricated by Hot Rolling
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Mechanical Properties of Ultra-Fine Grained Fe-Cr-Ni Alloy Fabricated by ARB
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Extrudability and Bonding Strength of Copper Clad Aluminum Alloy Composites Produced by Indirect Extrusion Process
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Effects of Microstructure on Mechanical Properties of HRS Processed SUS316L Stainless Steel
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Analysis of Surface Roughness of Immersion Sn Plating Film via Micro Etch Process
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Ring-Rolling Process for Manufacturing Ti-6Al-4V Plane and Profiled Ring-Products
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Mechanical Properties of Ultra-Fine Grained Fe-Cr-Ni Alloy Fabricated by ARB

Abstract:

Microstructures and mechanical properties of Fe-15wt.%Cr-10wt.%Ni alloy ARB processed by various cycles were studied. The starting material showed lath martensite structure. However, the austenitic phase became stable by the high straining (ARB) above Af temperature. The volume fraction of austenitic phase greatly increased to around 90 % by 2 ARB cycles and nearly saturated at about 95 % after higher ARB cycles. The grain refinement progressed during the ARB, which leaded to the formation of ultrafine lamellar UFG austenitic microstructure with mean lamellar spacing of about 300 nm. The UFG Fe-Cr-Ni alloy performed both high strength and large elongation. Especially, the yield strength of the alloy ARB processed by 5 cycles reached to 900 MPa, and the total elongation was 40 %. The good ductility of the present specimens was attributed to the occurrence of transformation-induced plasticity (TRIP).