Measurement of Crystal Grain Size of Austenitic Stainless Steels under Low-Cycle Fatigue by EBSD Techniques

Electron backscatter diffraction (EBSD) in conjunction with scanning electron microscopy was used to assess the fatigue damage induced in stainless steels. The parameter of the crystal grain size was devised in order to evaluate the fatigue damage in terms of the crystal grain size. It was concluded that the fatigue damage could be evaluated by the EBSD measurements using the relationship between the total strain range, the number of cycles and the crystal grain size.

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OS1205 Evaluation of Low Cycle Fatigue Damage for Type 316 Stainless Steels by Electron Backscatter Diffraction

The Proceedings of the Materials and Mechanics Conference ◽

10.1299/jsmemm.2008._os1205-1_ ◽

2008 ◽

Vol 2008 (0) ◽

pp. _OS1205-1_-_OS1205-2_

Author(s):

Teruaki YAMADA ◽

Masayuki KAMAYA ◽

Masatoshi KURODA ◽

Takeshi YASUDA ◽

Takuya DAIBA ◽

...

Keyword(s):

Fatigue Damage ◽

Stainless Steels ◽

Electron Backscatter Diffraction ◽

Low Cycle Fatigue ◽

Cycle Fatigue ◽

Electron Backscatter ◽

Backscatter Diffraction

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411 Development of Crystal Orientation Analysis Program of Austenitic Stainless Steels (II) : Evaluation of Fatigue Damage in terms of Crystal Grain Size

The Proceedings of Conference of Kyushu Branch ◽

10.1299/jsmekyushu.2010.63.141 ◽

2010 ◽

Vol 2010.63 (0) ◽

pp. 141-142

Author(s):

Masayuki Kamaya ◽

Takayuki Mori ◽

Teruaki Yamada ◽

Masatoshi Kuroda ◽

Kazuya Mori

Keyword(s):

Grain Size ◽

Fatigue Damage ◽

Stainless Steels ◽

Crystal Orientation ◽

Austenitic Stainless Steels ◽

Analysis Program ◽

Orientation Analysis

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Application of Surface Roughness Parameters to the Evaluation of Low Cycle Fatigue Damage in Austenitic Stainless Steel

Volume 5: High-Pressure Technology; ASME NDE Division; Rudy Scavuzzo Student Paper Symposium ◽

10.1115/pvp2013-97887 ◽

2013 ◽

Cited By ~ 1

Author(s):

Nao Fujimura ◽

Takashi Nakamura ◽

Hiroyuki Oguma

Keyword(s):

Surface Roughness ◽

Fatigue Life ◽

Fatigue Damage ◽

Crack Detection ◽

Low Cycle Fatigue ◽

Roughness Parameter ◽

Strain Range ◽

Maximum Height ◽

Roughness Parameters ◽

Number Of Cycles

Changes in the surface roughness of SUS316NG during cyclic loadings were investigated, and the relations between those changes and the crack initiation and propagation processes are discussed on the basis of microscopic observations and cellulose acetate replica observations. Strain-controlled fatigue tests were conducted at three constant strain ranges. Surface roughness was measured periodically during the tests, and three roughness parameters were calculated: arithmetic mean roughness Ra, surface profile maximum height Rmax, and maximum valley depth Rv. Until the middle of fatigue life, all three increased linearly with the number of cycles regardless of the strain range, and their rates of increase became smaller with decreasing strain range. Surface observation revealed that small cracks initiated very early in fatigue life, propagated slowly until the middle of fatigue life, and then grew rapidly. Changes in surface roughness are therefore sensitive to fatigue loading even when cracks are very small and crack detection is difficult. The results suggest that surface roughness can probably be used to assess fatigue damage because until the middle of fatigue life it increases linearly with the number of cycles. The definition of each roughness parameter and the changes show that Rmax and Rv are suitable for damage assessment.

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