Cr含量对高锰奥氏体TWIP钢高温氧化行为的影响

Effect of Cr Content on High-Temperature Oxidation Behavior of High-Manganese Austenitic TWIP Steel

通过恒温氧化增重实验和扫描电镜观察及XRD分析,研究了Cr含量对高锰奥氏体孪晶诱发塑性(TWIP)钢在700℃氧化8 h的高温氧化动力学过程及氧化产物的影响.结果表明:随着Cr含量的提高,高锰奥氏体TWIP钢的抗氧化能力增强;当Cr的质量分数为1.13%时,经过在700℃下8 h的高温氧化,样品单位面积的氧化增重为30μg/mm2;而当Cr的质量分数增加到3.95%时,单位面积的氧化增重降低至3μg/mm2.随着Cr含量的增加,高锰奥氏体TWIP钢氧化层的致密度提高,氧化产物的构成也具有明显的差异.

Through oxide weight gain experiment,SEMand XRD analysis,the effects of Cr content were studied on the high-temperature oxidation behavior,the microstructures and phase compositions of oxidation scale of a high-manganese austenitic twinning-induced plasticity（ TWIP） steel oxidized at 700 ℃ for 8 h. The results showthat with increasing the Cr content,the anti-oxidation ability of this high-manganese austenitic TWIP steel increases. When the Cr content is 1. 13 wt%,the mass gain of the steel oxidized at 700 ℃ for 8 h is about 30 μg / mm2,while the Cr content increases to 3. 95 wt%,the mass gain decreases to 3 μg / mm2. Moreover,with increasing the Cr content,the compactness of oxide scale increases,and there are significant differences in the composition of oxide scales.