摘要
以ESAB公司的三种9Cr-1Mo焊条的焊缝金属为研究对象,以Formastor-D全自动热膨胀记录仪分析了焊缝金属的连续冷却曲线,用MTS试验机分析了焊缝组织的断裂韧性.研究结果表明,Cr、N i、C和Mn等元素导致OK1和OK3的MS点应比OK2的低,奥氏体稳定性升高.710℃高温回火处理后,OK2焊缝组织的韧性较高.回火组织中碳化物沿晶界或相界析出使裂纹扩展更加容易从而使9Cr-1Mo焊缝组织的韧性降低.
The weld metals were prepared respectively with three ESAB company 9Cr- 1Mo electrodes. The CCT - diagrams of weld metals were analyzed with thermal dilatometer. The fracture mirographs were observed by SEM. The results show that the elements Cr,Ni ,C and Mn improve the stability of austenite and make Ms lower. The toughness of OK2 weld metal is the highest among all the three metals after tempering at about 710℃. The carbides precipitating during PHWT make the toughness of these metals lower.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2006年第1期39-41,共3页
Materials Science and Technology
基金
欧盟COST计划子项目
