Analysis of fracture toughness in the transition-temperature region of an Mn-Mo-Ni low-alloy steel

Sangho Kim, Byoungchul Hwang, Sunghak Lee

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

This study is concerned with the analysis of fracture toughness in the transition region of an Mn-Mo-Ni low-alloy steel, in accordance with the ASTM E1921 standard test method. Elastic-plastic cleavage fracture toughness (KJc) was determined by three-point bend tests, using precracked Charpy V-notch (PCVN) specimens, and relationships between KJc, the critical component of J (Jc), critical distance (Xc), stretch-zone width (SZW), local fracture stress, and plane-strain fracture toughness (KIc) were discussed on the basis of the cleavage fracture behavior in the transition region. The master curve and the 95 pct confidence curves well explained the variation in the measured KJc, and the Weibull slope measured on the Weibull plots was consistent with the theoretical slope of 4. Fractographic observation indicated that Xc linearly increased with increasing Jc, and that the SZW had a good correlation with KJc, irrespective of the test temperature. In addition, the local fracture stress was independent of the test temperature, because the tempered bainitic steel used in this study showed a propagation-controlled cleavage fracture behavior.

Original languageEnglish
Pages (from-to)1275-1281
Number of pages7
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume34 A
Issue number6
DOIs
StatePublished - Jun 2003
Externally publishedYes

Fingerprint

Dive into the research topics of 'Analysis of fracture toughness in the transition-temperature region of an Mn-Mo-Ni low-alloy steel'. Together they form a unique fingerprint.

Cite this