Influence of unique layered microstructure on fatigue properties of Ti-48Al-2Cr-2Nb alloys fabricated by electron beam melting

被引：52

作者：

Cho, Ken ^{[1
]}

Kobayashi, Ryota ^{[1
]}

Oh, Jong Yeong ^{[1
]}

Yasuda, Hiroyuki Y. ^{[1
]}

Todai, Mitsuharu ^{[2
]}

Nakano, Takayoshi ^{[1
]}

Ikeda, Ayako ^{[3
]}

Ueda, Minoru ^{[4
]}

Takeyama, Masao ^{[5
]}

机构：

[1] Osaka Univ, Grad Sch Engn, Div Mat & Mfg Sci, 2-1 Yamadaoka, Suita, Osaka 5650871, Japan

[2] Inst Niihama Natl Coll Technol, Dept Environm Mat Engn, 7-1 Yagumo Cho, Niihama, Ehime 7928580, Japan

[3] Natl Inst Mat Sci, Superalloy Res Grp, Res Ctr Struct Mat, 1-2-1 Sengen, Tsukuba, Ibaraki 3050047, Japan

[4] Met Technol Co Ltd, Nakano Ku, Harmony Tower 27F,1-32-2 Honcho, Tokyo 1648721, Japan

[5] Tokyo Inst Technol, Dept Met & Ceram Sci, Meguro Ku, 2-12-1 Ookayama, Tokyo 1528550, Japan

来源：

INTERMETALLICS | 2018年 / 95卷

基金：

日本科学技术振兴机构;

关键词：

Intermetallics (aluminides); Fatigue resistance and crack growth; Microstructure; Aero-engine components; LOW-CYCLE FATIGUE; INTERMETALLIC ALLOYS; TIAL ALLOYS; DEFORMATION; OPTIMIZATION; TEMPERATURE; CRYSTALS; BEHAVIOR; DESIGN;

D O I：

10.1016/j.intermet.2018.01.009

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The influence of a unique layered microstructure consisting of duplex-like region and equiaxed gamma grain layers (gamma bands) on the fatigue properties of Ti-48Al-2Cr-2Nb alloy bars fabricated by electron beam melting (EBM) was investigated at room temperature (RT) and 1023 K focusing on the angle (theta) between the building direction and cylinder (loading) axis. We found for the first time the fatigue strengths of the alloy bars with the layered microstructure depend strongly on the angle theta. Particularly, the fatigue strength of the alloy bars fabricated at theta = 45 degrees is comparable to that of the hot isostatic pressing (HIP) treated cast alloys, even without HIP treatment. We also found the alloy bars fabricated at theta = 0 degrees and 45 degrees exhibit high fatigue strengths in the low-cycle fatigue life region at 1023 K similar to theta = 45 degrees alloy bars at RT. These high fatigue strengths are caused by inhibition of the brittle main crack initiation by stress relaxation due to shear deformation at the gamma bands and large plasticity of the alloys. These findings indicate that the alloys fabricated by EBM at theta = 45 degrees with the unique layered microstructure have a great potential for aerospace and automobile applications.

引用

页码：1 / 10

页数：10

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