首页> 外文会议>Conference of Metallurgists >THE EFFECT OF COMPOSITION MODIFICATION AND GRAIN SIZE REFINEMENT ON THE OXIDATION BEHAVIOR OF STAINLESS STEEL COATINGS PRODUCED BY CRYOMILLING AND SPS
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THE EFFECT OF COMPOSITION MODIFICATION AND GRAIN SIZE REFINEMENT ON THE OXIDATION BEHAVIOR OF STAINLESS STEEL COATINGS PRODUCED BY CRYOMILLING AND SPS

机译:组合物改性和晶粒尺寸细化对低温和SPS生产的不锈钢涂层氧化行为的影响

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The modification of the composition of 316LSS combined to a grain refinement to the nanometer level was investigated to determine the potential oxidation resistance improvement on coatings produced using the Spark Plasma Sintering (SPS) technique. Three different SS coating systems were studied: conventional and nanostructured SS316L, and nanostructured SS316L containing 6 wt% Al. Oxidation kinetics was conducted for the three feedstock alloys, namely conventional SS, nSS, nSS6Al with a TGA at 500 °C, 800 °C and 1000 °C for 48 hr. Figure 1 shows the oxidation kinetic traces for the three alloys at 800 °C oxidation. For all tested temperatures, nSS6Al showed a lower weight gain than the conventional SS and nSS. The oxidation rate constant for the feedstock was calculated for all three systems for all tested temperatures and the results are plotted using Arrhenius oxidation kinetic equation as shown in Figure 2. The oxidation rate constants of nSS6Al alloy is lower than the rate constant of the conventional SS and nSS at all tested temperatures, which is caused by the outward diffusion of Al and slower oxidation kinetics once the initial Al_2O_3 layer is formed. The calculated activation energies of oxidation from the slope of Figure 2 for the nanostructured alloys are 97 kJ/mol for nSS and 85 kJ/mol for the nSS6Al. The values are all within the same order of magnitude and approximately half the calculated activation energy of181 kJ/mol obtained for the conventional SS. The reduced activation energy for the nanostructured alloys can be explained by the higher diffusivity arising from a higher volume fraction of grain boundaries for the nanostructured alloys which act as fast diffusion paths for elemental diffusion.
机译:316LSS的组合成的晶粒细化至纳米级组合物的修饰进行了研究,以确定在使用放电等离子烧结(SPS)技术产生的涂层的电势的耐氧化性的提高。三种不同的SS涂覆系统进行了研究:常规和纳米结构SS316L,和纳米结构的含有6重量%的Al SS316L。氧化动力学被用于三个原料合金,即通常的SS,NSS nSS6Al用TGA在500℃,800℃和1000℃下48小时进行的。图1示出了用于在800℃下氧化的三种合金氧化动力学痕迹。对于所有测试的温度,nSS6Al显示较低的体重增加比常规SS和NSS。计算了所有三个系统对于所有测试温度下,原料中的氧化速率常数和结果是使用阿列纽斯绘制氧化动力学方程如示于图2 nSS6Al合金的氧化速率常数比常规SS的速率常数下和NSS在所有测试温度下,这是由Al和较慢的氧化动力学的向外扩散一旦形成初始Al_2O_3的层而引起的。从图2的用于纳米结构合金斜率氧化的计算的活化能是97千焦/摩尔为NSS和85千焦/摩尔的nSS6Al。值都相同的数量级顺序内和大约一半的计算活化能of181千焦/摩尔用于传统SS获得。对于纳米结构的合金的活化减少能量可以通过从充当用于元素扩散快速扩散路径的纳米结构合金晶界的较高体积分数所产生的较高的扩散率来解释。

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