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对P92钢在650℃时效500、1000、3000、10000h试样的微观组织、冲击吸收能量和硬度进行了试验研究,并与原始态的组织性能进行比较。结果表明,P92钢在时效时组织中大量的Laves相沿原奥氏体晶界和马氏体板条界等界面处沉淀析出,且在时效初期即大量析出,析出速度较快,随后减缓,Laves相含量逐渐趋于稳定;Laves相颗粒的粗化速率大大高于沉淀强化相M_(23)C_6;冲击吸收能量随时效时间的增加单调下降,材质脆化;Laves相含量的增加程度与冲击吸收能量的降低程度相一致,两者之间存在对应关系;硬度随时效时间的增加呈下降趋势,但变化不大。
The microstructure, impact energy and hardness of P92 steel aged at 650 ℃ for 500, 1000, 3000 and 10000h were tested and compared with that of original state. The results show that a large amount of Laves phase precipitates along the boundaries of the original austenite grain boundaries and the martensite slab boundaries at the time of aging, and precipitates precipitously at the early stage of aging, precipitates rapidly and then slows down. Laves The content of Laves phase is gradually stabilized. The roughening rate of Laves phase particles is much higher than that of the precipitated phase M_ (23) C_6. The impact energy absorbs monotonously with the increase of aging time, and the material embrittlement. The increase of Laves phase content and impact absorption The degree of energy reduction is consistent with the corresponding relationship between the two; the hardness decreases with the increase of aging time, but little change.