Correlation of crack-tip opening angle for stable crack propagation with Charpy and drop-weight tear test properties in high-toughness API X70 pipeline steels

Byoungchul Hwang; Sang Yong Shin; Sunghak Lee; Nack J. Kim; Sangho Kim; Ki Bong Kang

doi:10.1007/s11661-006-0007-0

Correlation of crack-tip opening angle for stable crack propagation with Charpy and drop-weight tear test properties in high-toughness API X70 pipeline steels

Byoungchul Hwang, Sang Yong Shin, Sunghak Lee, Nack J. Kim, Sangho Kim, Ki Bong Kang

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

Correlation between Charpy V-notch (CVN) impact properties, drop-weight tear test (DWTT) properties, and crack-tip opening angles for stable crack propagation (CTO_sc) in high-toughness API X70 pipeline steels was investigated in this study. Two-specimen CTOA test (TSCT) was conducted on the rolled steel materials to measure the CTOA_sc, and the test results were compared to the CVN and DWTT data to find correlations between them. The CVN total energy density showed an almost 1:1 linear correlation with the DWTT initiation energy density. The TSCT results indicated that the materials rolled in the single-phase region had the larger CTOA_sc as well as the higher CVN and DWTT energy density than those rolled in the two-phase region because their microstructures were composed of acicular ferrites and fine polygonal ferrites. The CTOA_sc had a better correlation with the DWTT propagation energy density or the CVN total energy density than the DWTT total energy density. In particular, the value of sin (2CTOA_sc) reliably represented a linear proportional relation to the DWTT propagation energy density.

Original language	English
Pages (from-to)	371-380
Number of pages	10
Journal	Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume	37
Issue number	2
DOIs	https://doi.org/10.1007/s11661-006-0007-0
State	Published - Feb 2006
Externally published	Yes

Funding

This work was financially supported by the National Research Laboratory Program, funded by the Korea Science and Engineering Foundation and by POSCO, under Contract No. PL-03909. The authors thank Drs. Jang Yong Yoo, Seong Soo Ahn, and Dong Han Suh, POSCO, for their help with the DWTT testing and data analyses.

Funders	Funder number
POSCO	PL-03909
Korea Science and Engineering Foundation

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Hwang, B., Shin, S. Y., Lee, S., Kim, N. J., Kim, S., & Kang, K. B. (2006). Correlation of crack-tip opening angle for stable crack propagation with Charpy and drop-weight tear test properties in high-toughness API X70 pipeline steels. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 37(2), 371-380. https://doi.org/10.1007/s11661-006-0007-0

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title = "Correlation of crack-tip opening angle for stable crack propagation with Charpy and drop-weight tear test properties in high-toughness API X70 pipeline steels",

abstract = "Correlation between Charpy V-notch (CVN) impact properties, drop-weight tear test (DWTT) properties, and crack-tip opening angles for stable crack propagation (CTOsc) in high-toughness API X70 pipeline steels was investigated in this study. Two-specimen CTOA test (TSCT) was conducted on the rolled steel materials to measure the CTOAsc, and the test results were compared to the CVN and DWTT data to find correlations between them. The CVN total energy density showed an almost 1:1 linear correlation with the DWTT initiation energy density. The TSCT results indicated that the materials rolled in the single-phase region had the larger CTOAsc as well as the higher CVN and DWTT energy density than those rolled in the two-phase region because their microstructures were composed of acicular ferrites and fine polygonal ferrites. The CTOAsc had a better correlation with the DWTT propagation energy density or the CVN total energy density than the DWTT total energy density. In particular, the value of sin (2CTOAsc) reliably represented a linear proportional relation to the DWTT propagation energy density.",

author = "Byoungchul Hwang and Shin, {Sang Yong} and Sunghak Lee and Kim, {Nack J.} and Sangho Kim and Kang, {Ki Bong}",

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Hwang, B, Shin, SY, Lee, S, Kim, NJ, Kim, S & Kang, KB 2006, 'Correlation of crack-tip opening angle for stable crack propagation with Charpy and drop-weight tear test properties in high-toughness API X70 pipeline steels', Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, vol. 37, no. 2, pp. 371-380. https://doi.org/10.1007/s11661-006-0007-0

Correlation of crack-tip opening angle for stable crack propagation with Charpy and drop-weight tear test properties in high-toughness API X70 pipeline steels. / Hwang, Byoungchul; Shin, Sang Yong; Lee, Sunghak et al.
In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 37, No. 2, 02.2006, p. 371-380.

Research output: Contribution to journal › Article › peer-review

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AB - Correlation between Charpy V-notch (CVN) impact properties, drop-weight tear test (DWTT) properties, and crack-tip opening angles for stable crack propagation (CTOsc) in high-toughness API X70 pipeline steels was investigated in this study. Two-specimen CTOA test (TSCT) was conducted on the rolled steel materials to measure the CTOAsc, and the test results were compared to the CVN and DWTT data to find correlations between them. The CVN total energy density showed an almost 1:1 linear correlation with the DWTT initiation energy density. The TSCT results indicated that the materials rolled in the single-phase region had the larger CTOAsc as well as the higher CVN and DWTT energy density than those rolled in the two-phase region because their microstructures were composed of acicular ferrites and fine polygonal ferrites. The CTOAsc had a better correlation with the DWTT propagation energy density or the CVN total energy density than the DWTT total energy density. In particular, the value of sin (2CTOAsc) reliably represented a linear proportional relation to the DWTT propagation energy density.

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Correlation of crack-tip opening angle for stable crack propagation with Charpy and drop-weight tear test properties in high-toughness API X70 pipeline steels

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