Brittle-to-ductile transition in fcc alloys and its mechanism.

2015 Fiscal Year Final Research Report

• Project/Area Number: 26630353
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Structural/Functional materials
• Research Institution: Kyushu University
• Principal Investigator: Tanaka Masaki 九州大学, 工学(系)研究科(研究院), 准教授 (40452809)
• Co-Investigator(Kenkyū-buntansha): HIGSHIDA Kenji 九州大学, 大学院工学研究院, 教授 (70156561) ; MORIKAWA Tatsuya 九州大学, 大学院工学研究院, 助教 (00274506)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 構造材料 / 転位

Outline of Final Research Achievements

Austenitic steels are wildly used in low temperature environments since metals with face-centred-cubic structure do not show low temperature embrittlement. Since those steels contain a large amount of Ni which is expensive, Ni-free austenitic high nitrogen steels draw an attention, replacing Ni with nitrogen. It has been thought that fcc metals do not show low temperature embrittlement, however, Ni-free austenitic high nitrogen steels show brittle-to-ductile transition. In the present study, the mechanism behind the transition was elucidated.

Free Research Field

結晶塑性