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Microstructure and performance of 1.25Cr0.5Mo steel weldments

机译：1.25Cr0.5Mo钢焊件的组织与性能

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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℃ 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.
机译：与1.25Cr0.5Mo钢中的焊件制造相关的复杂热循环已得到记录。对于指定程序允许的编织焊接，在制造过程中，与焊接轮廓相邻的基础材料位置在800℃以上经受了七个偏移。这些热循环的多样性导致了焊缝金属和热影响区的高度细化。蠕变测试表明，所产生的焊件极易受到Ⅳ型裂纹的影响，并在试件表面下方形成空腔和微裂纹的形式损坏。该观察结果加上实际的遇险证据出现在生命中相对较晚的事实，表明传统的结构完整性评估方法可能不够充分。

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