在不同含氧超临界水中奥氏体钢TP347HFG的氧化特性

Oxidation of TP347HFG Austenitic Steel in Supercritical Water with Different Dissolved Oxygen Contents

为探讨超临界水中不同含氧量对奥氏体钢氧化特性的影响,在600℃,25 MPa超临界水中不同溶解氧量（0、100、300 ppb）情况下对奥氏体钢TP347HFG进行试验,分析得出在300 ppb条件下奥氏体钢TP347HFG氧化增重最大,这是由于300 ppb环境下氧分压比较高,提高了金属离子向外扩散的速率从而增大氧化。本文还发现在不同溶解氧量的超临界水中,奥氏体钢TP347HFG会发生剥落现象,并分析了其原因。

To explore the influence of oxygenated treatment on austenitic steels, austenitic steel TP347HFG was investigated in supercfitical water at 600℃ under pressure of 25 MPa in different oxygen contents. That the weight gain of austenitic steel TP347I-IFG was the biggest under 300 ppb, which was because the oxygen partial pressure in 300 ppb was relatively higher, increasing the outward diffusion rate of Fe iron and that the austenitic steel oxide would exfoliate under different dissolved oxygen contents. The reason for oxide exfoliation was also analyzed.