Hydrogen gas effects on the fatigue crack growth behavior of Cr-Mo Steel CT specimen in extremely low rate range

Koki Tazoe, Yasuji Oda, Hiroshi Noguchi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

In order to investigate extremely slow fatigue crack growth characteristics of JIS SCM440 CT specimen in 9 MPa hydrogen gas environment, stress intensity factor range (ΔK) decreasing tests with in-situ observation were carried out. Fatigue crack growth rate (FCGR) in hydrogen gas did not show threshold behavior but FCGR in helium and air showed threshold behavior clearly. Fatigue crack in hydrogen gas showed sudden increased after a temporary stop in growth. The sudden increase in growth was induced by coalescing with a new micro-crack initiated in front of the main crack tip. The fractographic analysis showed the existence of intergranular facets. The intergranular facets were observed in all over the fracture surface. The amount of the intergranular facets in hydrogen gas decreased with decreasing the ΔK. However, facets were still observed in the extremely low rate region. On the other hand, there was no facet in fracture surface tested in helium and in air in the extremely low rate region. The formation of facets was supposed to be one of the causes of non-threshold behavior in hydrogen gas.

Original languageEnglish
Title of host publication19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012
PublisherEuropean Conference on Fracture, ECF
ISBN (Print)978-5-905576-18-8
Publication statusPublished - 2012
Event19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012 - Kazan, Russian Federation
Duration: Aug 26 2012Aug 31 2012

Other

Other19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012
CountryRussian Federation
CityKazan
Period8/26/128/31/12

Fingerprint

Fatigue crack propagation
Hydrogen
Steel
Gases
Helium
Air
Stress intensity factors
Crack tips
Cracks

All Science Journal Classification (ASJC) codes

  • Safety, Risk, Reliability and Quality

Cite this

Tazoe, K., Oda, Y., & Noguchi, H. (2012). Hydrogen gas effects on the fatigue crack growth behavior of Cr-Mo Steel CT specimen in extremely low rate range. In 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012 European Conference on Fracture, ECF.

Hydrogen gas effects on the fatigue crack growth behavior of Cr-Mo Steel CT specimen in extremely low rate range. / Tazoe, Koki; Oda, Yasuji; Noguchi, Hiroshi.

19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012. European Conference on Fracture, ECF, 2012.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Tazoe, K, Oda, Y & Noguchi, H 2012, Hydrogen gas effects on the fatigue crack growth behavior of Cr-Mo Steel CT specimen in extremely low rate range. in 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012. European Conference on Fracture, ECF, 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012, Kazan, Russian Federation, 8/26/12.
Tazoe K, Oda Y, Noguchi H. Hydrogen gas effects on the fatigue crack growth behavior of Cr-Mo Steel CT specimen in extremely low rate range. In 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012. European Conference on Fracture, ECF. 2012
Tazoe, Koki ; Oda, Yasuji ; Noguchi, Hiroshi. / Hydrogen gas effects on the fatigue crack growth behavior of Cr-Mo Steel CT specimen in extremely low rate range. 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012. European Conference on Fracture, ECF, 2012.
@inproceedings{11fe519529f84488831eb3fb30c08286,
title = "Hydrogen gas effects on the fatigue crack growth behavior of Cr-Mo Steel CT specimen in extremely low rate range",
abstract = "In order to investigate extremely slow fatigue crack growth characteristics of JIS SCM440 CT specimen in 9 MPa hydrogen gas environment, stress intensity factor range (ΔK) decreasing tests with in-situ observation were carried out. Fatigue crack growth rate (FCGR) in hydrogen gas did not show threshold behavior but FCGR in helium and air showed threshold behavior clearly. Fatigue crack in hydrogen gas showed sudden increased after a temporary stop in growth. The sudden increase in growth was induced by coalescing with a new micro-crack initiated in front of the main crack tip. The fractographic analysis showed the existence of intergranular facets. The intergranular facets were observed in all over the fracture surface. The amount of the intergranular facets in hydrogen gas decreased with decreasing the ΔK. However, facets were still observed in the extremely low rate region. On the other hand, there was no facet in fracture surface tested in helium and in air in the extremely low rate region. The formation of facets was supposed to be one of the causes of non-threshold behavior in hydrogen gas.",
author = "Koki Tazoe and Yasuji Oda and Hiroshi Noguchi",
year = "2012",
language = "English",
isbn = "978-5-905576-18-8",
booktitle = "19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012",
publisher = "European Conference on Fracture, ECF",

}

TY - GEN

T1 - Hydrogen gas effects on the fatigue crack growth behavior of Cr-Mo Steel CT specimen in extremely low rate range

AU - Tazoe, Koki

AU - Oda, Yasuji

AU - Noguchi, Hiroshi

PY - 2012

Y1 - 2012

N2 - In order to investigate extremely slow fatigue crack growth characteristics of JIS SCM440 CT specimen in 9 MPa hydrogen gas environment, stress intensity factor range (ΔK) decreasing tests with in-situ observation were carried out. Fatigue crack growth rate (FCGR) in hydrogen gas did not show threshold behavior but FCGR in helium and air showed threshold behavior clearly. Fatigue crack in hydrogen gas showed sudden increased after a temporary stop in growth. The sudden increase in growth was induced by coalescing with a new micro-crack initiated in front of the main crack tip. The fractographic analysis showed the existence of intergranular facets. The intergranular facets were observed in all over the fracture surface. The amount of the intergranular facets in hydrogen gas decreased with decreasing the ΔK. However, facets were still observed in the extremely low rate region. On the other hand, there was no facet in fracture surface tested in helium and in air in the extremely low rate region. The formation of facets was supposed to be one of the causes of non-threshold behavior in hydrogen gas.

AB - In order to investigate extremely slow fatigue crack growth characteristics of JIS SCM440 CT specimen in 9 MPa hydrogen gas environment, stress intensity factor range (ΔK) decreasing tests with in-situ observation were carried out. Fatigue crack growth rate (FCGR) in hydrogen gas did not show threshold behavior but FCGR in helium and air showed threshold behavior clearly. Fatigue crack in hydrogen gas showed sudden increased after a temporary stop in growth. The sudden increase in growth was induced by coalescing with a new micro-crack initiated in front of the main crack tip. The fractographic analysis showed the existence of intergranular facets. The intergranular facets were observed in all over the fracture surface. The amount of the intergranular facets in hydrogen gas decreased with decreasing the ΔK. However, facets were still observed in the extremely low rate region. On the other hand, there was no facet in fracture surface tested in helium and in air in the extremely low rate region. The formation of facets was supposed to be one of the causes of non-threshold behavior in hydrogen gas.

UR - http://www.scopus.com/inward/record.url?scp=84905455348&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84905455348&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:84905455348

SN - 978-5-905576-18-8

BT - 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012

PB - European Conference on Fracture, ECF

ER -