Microstructure and performance of 1.25Cr0.5Mo steel weldments
作者:
ParkerJ. D.,
StratfordG. C.,
期刊:
Materials at High Temperatures
(Taylor Available online 1995)
卷期:
Volume 13,
issue 1
页码: 37-45
ISSN:0960-3409
年代: 1995
DOI:10.1080/09603409.1995.11689499
出版商: Taylor&Francis
关键词: microstructure;weldments;1.25Cr0.5Mo steel
数据来源: Taylor
摘要:
The complex thermal cycles associated with fabrication of weldments in 1.25Cr0.5Mo steel have been documented. For the weaved welding allowed by the specified procedure, base material locations adjacent to the weld profile have been subjected to up to seven excursions above 800°C during fabrication. The multiplicity of these thermal cycles resulted in a large degree of refinement within the weld metal and heat-affected zone. Creep testing has shown that the weldments produced are highly susceptible to type IV cracking, with damage in the form of cavities and microcracks developing below the specimen surface. This observation, combined with the fact that physical evidence of distress occurs relatively late in life, indicates that traditional methods of structural integrity assessment may be inadequate.
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