2．25Cr-1Mo-0．25V钢的焊缝回火脆化研究

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In practical manufacture ,we found that welding rod of the same trademark but different batch has distinct different tendency of brittleness when they are experienced step cooling embrittling treatment process. The chemical composition, mechanical properties, ductile - brittle transition temperature and met- allurgical microscope of 2.25 Cr - 1Mo -0.25V steel have been investigated, and the results show that the .,reason of temper brittleness is that the content of Si and Mn are high and phosphorus and carbonization ;segregation on grain boundary.实际生产中发现，同一牌号、不同批次的熔敷金属阶冷后脆化倾向明显不同。对2．25Cr-1Mo-0．25V焊缝的化学成分、力学性能、韧脆转变温度以及金相显微组织进行了研究，认为产生回火脆性是由于Si和Mn含量较高、磷元素以及碳化物在晶界上偏聚所致。