热处理温度对G3合金耐点蚀性能的影响

发布时间：2018-03-12 16:03

本文选题：热处理温度　切入点：晶界析出相　出处：《稀有金属材料与工程》2015年07期 　论文类型：期刊论文

【摘要】：采用SEM、EDS、TEM等方法研究了不同热处理温度对G3合金组织形态及晶界析出相的影响;进而利用浸泡模拟实验和电化学实验,分析组织变化以及晶界析出相对G3合金耐点蚀性能的影响。结果表明:晶界析出相对G3合金耐点蚀性能起着关键的作用。低温退火时由于G3合金析出相变少,组织均匀性增加,G3合金耐点蚀性能有所增加。而随着退火温度的进一步升高,在晶界生成大量的析出相。析出相的大量生成使得G3合金组织不均匀性增加,同时造成贫Mo区域钝化膜稳定性变差,容易发生局部活化溶解,点蚀敏感性明显增加。
[Abstract]:The effects of different heat treatment temperatures on the microstructure and precipitate phase at grain boundary of G3 alloy were studied by means of SEMMA-EDS- TEM, and then immersion simulation and electrochemical experiments were used to study the effect of heat treatment temperature on the microstructure and precipitate phase of G3 alloy. The effect of grain boundary precipitation on pitting corrosion resistance of G3 alloy is analyzed. The results show that grain boundary precipitation plays a key role in pitting corrosion resistance of G3 alloy. The pitting corrosion resistance of G3 alloy increases with the increase of microstructure homogeneity, but with the further increase of annealing temperature, a large number of precipitated phases are formed at grain boundaries, and the microstructure inhomogeneity of G3 alloy increases with the formation of a large number of precipitated phases. At the same time, the stability of passivation film in Mo poor region becomes worse, local activation and dissolution occur easily, and the pitting sensitivity increases obviously.
【作者单位】：北京科技大学;宝山钢铁股份有限公司研究院;中国石油集团工程设计有限责任公司北京分公司;
【基金】：国家自然科学基金(51134011)
【分类号】：TG166.7

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