Basic investigation for improvement of fatigue properties and fracture mechanisms of the dissimilar joints by friction stir welding

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K05704
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Materials/Mechanics of materials
• Research Institution: National Institute of Technology, Toyama College
• Principal Investigator: OKANE MASAKI 富山高等専門学校, 機械システム工学科, 教授 (90262500)
• Research Collaborator: ISHIHARA Sotomi
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 摩擦攪拌 / 摩擦攪拌接合 / 異種金属接合体 / 疲労強度 / 疲労破壊

Outline of Final Research Achievements

In this study, several kinds of the dissimilar joints of steel and Al alloy by means of friction stir welding (FSW) were prepared for investigating the best welding condition for each combination of the specimen. The fatigue tests were carried out for clarifying basic fatigue strength properties and for investigating the fatigue fracture mechanisms of the joints. Further, heat treatment (asing) was applied for some joint specimens for recovering of hardness in the welding region, and effect of heat treatment (asing) on fatigue strength properties of the dissimilar joints was also investigated.

Free Research Field

材料強度学