Improvement of strength at both ambient and high temperatures by formation of modulated structure distribution by RBT.

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K06499
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Material processing/Microstructural control engineering
• Research Institution: Hirosaki University
• Principal Investigator: SATO HIROYUKI 弘前大学, 理工学研究科, 教授 (10225998)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: クリープ / 高温変形 / クリープ曲線 / ひずみ加速指数 / 遷移クリープ / 寿命予測 / アルミニウム合金 / 組織勾配

Outline of Final Research Achievements

To improve creep strength, macroscopic distribution of microstructure is formed by combination of rotary-bending and tensile loading, named RBT-loading (Rotary-Bend and Tensile loading) in aluminum alloys. Shape of creep curve in transient creep regime are influenced by RBT-loading, and creep curve show complex behavior when microstructural distribution is formed. It is suggested that creep strength in primary regime can be improved by combination of RBT-loading and heat treatment.
Creep curves are analyzed by Strain-Acceleration and Transition Objective Index (SATO-Index). It is shown that the entire creep curve of alloys including complex primary behavior can be reconstructed by a method of SATO-Index with section partitioning.

Free Research Field

高温変形