Upper shelf temperature dependence of fracture toughness for four low to intermediate strength ferritic steels
✍ Scribed by W.A. Logsdon; J.A. Begley
- Publisher
- Elsevier Science
- Year
- 1977
- Tongue
- English
- Weight
- 731 KB
- Volume
- 9
- Category
- Article
- ISSN
- 0013-7944
No coin nor oath required. For personal study only.
✦ Synopsis
To examine the inadequacy and expose the potential consequences of utilizing transition temperature range fracture toughness values when performing fracture mechanics analyses on structures operating at upper shelf temperatures, the upper shelf fracture toughness behavior of three rotor forging steels (ASTM A471 NiCrMoV, ASTM A470 CrMoV and AISI 403 modified 12Cr) plus an ASTM A217 2$Zr-1Mo cast steel was investigated. Elastic-plastic fracture toughness values were obtained via the J,= resistance curve test technique. Except for the CrMoV rotor steel, upper shelf fracture toughness peaked near the temperature where zero percent brittle fracture first occurred in the Charpy V-notch impact tests after which decreases of 2545% in toughness were realized. Fracture toughness tests were conducted up to 800°F.