表面状态对TP347H钢蒸汽氧化速度的影响

Effect of Surface State on Steam Oxidation Rate of Steel TP347H

研究了磨削、喷丸、细晶粒+酸洗、磨削+酸洗和15%变形+酸洗等5种状态TP347H钢试样在650℃水蒸气中氧化2 000h的表面形态和氧化速度.用蒸汽氧化炉进行蒸汽氧化试验,用扫描电子显微镜和能谱仪对氧化后试样表面氧化膜的形貌和成分进行了观察和分析,用X射线衍射(XRD)分析了表面氧化膜的结构,用减重法和厚度法测试和计算了5组TP347H试样在蒸汽中的氧化速度.结果表明:表面状态不同的试样在水蒸气中氧化时,形成的氧化膜形貌相似,但氧化速度不同.氧化速度由小到大依次为磨削试样、喷丸试样、细晶粒+酸洗试样、磨削+酸洗试样和15%变形+酸洗试样.

Steam oxidation tests were carried out at 650 ℃ for 2 000 hours in steam oxidation furnace for TP347H specimens with surfaces respectively treated by grinding, shot blasting, fine grain ＋ acid pick- ling, grinding ＋ acid pickling and 15% cold deforming ＋ acid pickling, so as to analyze the influence of the surface state on the oxidation rate, during which the surface morphology and composition of oxidized specimens were observed and studied using SEM and EDS, while the oxidation film analyzed using XRD, and the oxidation rate calculated by weight loss and thickness method. Results show that the oxidation films formed on above five specimens have basically similar morphology, but their oxidation rates are dif- ferent, which are found to be in following increasing order： grinding, shot blasting, fine grain ＋ acid pickling, grinding ＋ acid pickling and 15% cold deforming ＋ acid pickling specimen.