Effect of Shot Peening on High Temperature Steam Oxidation Resistance of S31035 Austenitic Heat Resistant Steel
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摘要: 对S31035钢进行喷丸处理,再在665 ℃下进行高温蒸汽氧化试验,研究了喷丸处理对该钢抗高温水蒸气氧化行为的影响。结果表明:未喷丸试样在氧化100 h后即出现明显的氧化物衍射峰,氧化3 000 h后形成双氧化物层,氧化膜厚度约为8.07 μm;喷丸试样在氧化1 000 h后才出现微弱的(Fe,Cr)2O3衍射峰,在氧化3 000 h后表面氧化膜仍然较薄,厚度仅为0.45 μm;在氧化过程中,喷丸试样的氧化速率常数比未喷丸试样低3个数量级,抗水蒸气氧化性能较好;喷丸处理细化了表层晶粒,为铬元素扩散提供了更多通道,使表面形成Cr2O3保护膜而提高了该钢的抗高温水蒸气氧化性能。Abstract: The S31035 steel was shot peened, and then the high temperature steam oxidation test was carried out at 665 ℃. The effect of shot peening on the high temperature steam oxidation behavior of the steel was studied. The results show that the unpeening sample had obvious oxide diffraction peaks after 100 h oxidation, and a double-layer of oxides was formed after 3 000 h oxidation. The oxide film thickness of the unpeening sample was about 8.07 μm. The weak (Fe,Cr)2O3 diffraction peak appeared in the shot peening sample after 1 000 h oxidation, and the surface oxide film was still thin after 3 000 h oxidation, with a thickness of only 0.45 μm. In oxidation, the oxidation rate constant of the shot peening sample was 3 orders of magnitude lower than that of the unpeening sample, and the steam oxidation resistance was better. The shot peening refined the surface grains, which provided more channels for chromium diffusion and led to formation of a Cr2O3 protective film on the surface, thereby improved the high temperature steam oxidation resistance of the steel.
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Keywords:
- shot peening /
- grain refinement /
- S31035 steel /
- water vapor oxidation
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