期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2022.142629
关键词
Thermal aging embrittlement; Mechanical property; Activation energy; Austenitic stainless steel weld; Spinodal decomposition
类别
资金
- Nuclear Safety Research Program through the Korea Foundation Of Nuclear Safety (KoFONS) - Nuclear Safety and Security Commission (NSSC) of the Republic of Korea [2103078-0121-SB110, 1805005-0421-WT112]
- Korea Foundation of Nuclear Safety (KoFONS) [2103078-0121-SB110] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The long-term thermal aging behavior of a 316L austenitic stainless steel welds was investigated using different mechanical property testing methods. The activation energies were estimated and discussed in relation to the contribution of embrittled 6-ferrite to fracture and deformation.
The long-term thermal aging behavior of a 316L austenitic stainless steel welds containing similar to 12% of 6-ferrite was investigated using the nano-scale (nanopillar compression), micro-scale (micro-hardness and small punch), and macro-scale (tensile and J-R) mechanical property testing methods. Specimens were aged at 343, 375, and 400 degrees C for up to 20,000 h. The thermal aging activation energies were estimated based on the various mechanical test results using two fitting methods. The activation energies vary from 124 to 300 kJ/mol, depending on fitting and mechanical testing methods. Among the mechanical properties, the nanopillar and J-R test results showed similar activation energies lower than those from other mechanical properties. The similarities and discrepancies among the estimated activation energies were discussed in view of the contribution of embrittled 6-ferrite to the fracture and deformation of test specimens.
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