Effect of artificial defects on the very high cycle fatigue behavior of 316L stainless steel

Xiong, Z.*; Naoe, Takashi; Futakawa, Masatoshi

Metals, 9(4), p.412_1 - 412_11, 2019/04

AA2019-0011.pdf:2.4MB

https://doi.org/10.3390/met9040412

The effect of surface defects on the very high cycle fatigue (VHCF) behavior were investigated on the solution annealed (SA) and cold-rolled (CW) 316L. Surface defects were artificially created using indentation. VHCF test was conducted using an ultrasonic fatigue method. The results showed that the fatigue crack initiation was independent of the indent with the applied range of depth in this research. Furthermore, the critical depth of the indent was evaluated based on an empirical formula. In the case of SA, the VHCF strength was not affected when the indent depth was less than 40 m, which is consistent with the value obtained from the empirical formula. In the case of 20% CW, VHCF strength was not affected when the indent depth was less than 80 m. The results were much larger than the results obtained from the empirical formula and might have been caused by the plastic deformation, residual stress and probable deformation induced martensite transition around the indent.

Magnetic interrogation method for nondestructive measurement of radiation hardening of nuclear reactor pressure vessels

Ara, Katsuyuki; ; ; Sakasai, Kaoru

Proceedings of 8th International Conference on Pressure Vessel Technology (ICPVT-8), 1, p.183 - 189, 1996/00

no abstracts in English

Correlation between the strength and Vickers hardness of some nuclear graphites

; ;

Carbon, 12(4), p.477 - 479, 1974/04

https://doi.org/10.1016/0008-6223(74)90015-3

no abstracts in English

Studies on Detection of Low Temperature Embrittlement in Brittle Metals in Hardness Measurements

; ; *

Zairyo, 19(203), p.729 - 736, 1970/08

https://doi.org/10.2472/jsms.19.729

no abstracts in English

Study on measurement technique for ZrBx composition and hardness based on Laser Induced Breakdown Spectroscopy (LIBS), 2; Measurement characteristic on different composite specimens

Okazaki, Kodai*; Kawakami, Tomohiko*; Abe, Yuta; Otaka, Masahiko; Oishi, Yuji*

no journal, , 

no abstracts in English

Applicability of metal boride hardness measurement using Laser-Induced Breakdown Spectroscopy (LIBS), 2; Element distribution of metal boride specimens with complicated composition

Okazaki, Kodai*; Kawakami, Tomohiko*; Nagayama, Sakiko*; Abe, Yuta; Otaka, Masahiko; Makuuchi, Etsuyo*; Oishi, Yuji*; Takagai, Yoshitaka*

no journal, , 

no abstracts in English

Evaluation of -phase based titanium alloys

Wakai, Eiichi; Ishida, Taku*; Kano, Sho*; Shibayama, Tamaki*; Sato, Koichi*; Noto, Hiroyuki*; Makimura, Shunsuke*; Furuya, Kazuyuki*; Yabuuchi, Atsushi*; Yoshiie, Toshimasa*; et al.

no journal, , 

Titanium materials have been applied to beam window materials and beam dumps in large accelerator systems because of their low specific gravity, high corrosion resistance, strength, and other advantages. As the beam power becomes higher, further improvement of irradiation resistance is required. We have investigated further the properties of titanium alloys based on the -phase, and it was found that Ti-15-3-3-3 alloys have excellent irradiation resistance when subjected to ion irradiation. In order to investigate the cause of this, microstructures and point defects in this and related materials were evaluated by TEM, positron lifetime measurement, electrical resistivity, and stress-induced changes, among others. In addition, we have recently begun to develop a prototype of a titanium-based high-entropy alloy based on -titanium, which is attracting worldwide attention and is being developed, and have also begun to evaluate the emotional properties of this alloy. We have examined the various properties of this material and found that it has considerably higher strength than conventional iron- and titanium-based materials.