摘要
研究了稀土元素钇对超临界发电机组用9Cr-1Mo焊缝组织和性能的影响。采用熔滴过渡的方式将氧化钇从焊条药皮中添加到焊缝金属中,通过力学性能、相变点测试、扩散氢含量测量等试验确定了最佳综合性能的钇含量,在此基础上进一步对稀土含量相对比(RRY)为1.5实际焊接接头和未含稀土元素的商用焊条进行了室温拉伸、系列冲击、高温拉伸、硬度试验。结果表明,含稀土元素组的性能均高于未含稀土元素的试样,通过金相、SEM、XDR等分析,发现了第二相粒子是提高性能,特别是低温冲击性能的主要原因。
The effects of trace yttrium oxidation on the properties and the microstructures of 9Cr-1Mo steel welds for super critical generation units and USC units have been studied. Yttrium has been added into weld metal by coating transition （e. g. molten droplet method）. The yttrium content for optimized properties and structures has been determined. Comparison tests including room temperature and high temperature tensile tests, serials impact test, metallographic analysis, diffusion hydrogen measuring, phase transformation point, SEM, XDR etc. have been performed on the welds with and without yttrium. It is found that second phase particles make an important contribution to improving the properties of the weld metal, especially low temperature impact performance.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2014年第9期2064-2068,共5页
Rare Metal Materials and Engineering
基金
Science and Technology Supporting Project of Jilin Provincial Science and Technology Department(20090328)
