P.Parameswaran
材料科学技术（英文）
Electron enregy loss spectroscopy (EELS) and energy filtering transmission electron microscopy (EFTEM) investigation on 2.25Cr-1Mo steel was carried out to understand the nature of evolution of secondary carbides. The filtered images obtained from two different ageing treatments indicate that the steel evolves to a more stable carbide namely M23C6 in comparison to M2C. Microchemical information was generated from EELS spectra. Suitable choice for estimating the microchemical state was discussed. To evaluate the behaviour of ageing an elemental ratio of Fe to Cr is employed.
关键词:
Ferritic steels
,
Steels
,
2.25Cr-1Mo
,
steels
,
EFTEM
惠虎
,
王佳欢
,
王仙河
,
曹昱澎
,
杨帆
机械工程材料
针对运行了20万h的加氢反应器接管弯头材料2.25Cr-1Mo钢,测试了其低温拉伸性能、夏比Ⅴ型缺口冲击功及断裂韧性;在此基础上,得到了其主曲线的参考温度,通过进一步预测得到了该钢在整个韧脆转变区的断裂韧度分布.结果表明:2.25Cr-1Mo钢主曲线的参考温度为-154℃;经过20万h的运行,该钢仍具有充足的韧性;验证了主曲线方法对非核电用2.25Cr-1Mo钢的适用性.
关键词:
2.25Cr-1Mo钢
,
主曲线
,
韧脆转变区
,
断裂韧性
