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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >High-temperature tribological behavior of structural materials after conditioning in impure-helium environments for high-temperature gas-cooled reactor applications
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High-temperature tribological behavior of structural materials after conditioning in impure-helium environments for high-temperature gas-cooled reactor applications

机译：高温气体冷却反应器应用纯度氦气环境中结构材料的高温摩擦学行为

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摘要

Incoloy 800HT and Inconel 617 have been selected as candidate structural alloys for the hightemperature gas-cooled reactor (HTGR) concept. Helium, the primary coolant, contains impurities (e.g., H2O and CH4) that can induce corrosion reactions at high temperatures, which in turn can affect the tribological behavior of components in sliding contact such as valves and control-rod drive systems. This paper presents results from the study of the tribological behavior of both alloys before and after conditioning them in either an impure-helium oxidizing environment or in an air environment. Both alloys were conditioned for 22 days at elevated temperatures in a once-through helium loop with 4 ppmv H2O and tested subsequently at elevated temperatures with a pin-on-disk tribometer in an air environment 650 degrees C and 750 degrees C for 800HT; 850 degrees C and 900 degrees C for 617 - with various applied loads - 1 N, 2 N and 5 N. SEM-EDS analysis revealed that conditioning the samples in an oxidizing environment leads to the formation of a mixed Fe/Cr-oxide on alloy 800HT and a Cr-oxide on alloy 617, both increasing the wear resistance compared to that of as-received samples. Alloy 617 exhibited lower steady-state friction coefficients compared to those of alloy 800HT. There was a significant decrease in the scatter of the steadystate friction coefficient of the conditioned samples compared to that of the unconditioned samples. The steady-state friction coefficient for alloy 800HT and 617 were found to be 0.53 +/- 0.07 and 0.25 +/- 0.04, respectively. The wear resistance of alloy 800HT is approximately one order of magnitude lower than that of alloy 617 in all cases that exhibited measurable wear. After sample conditioning, the wear volumes measured at low loads were undistinguishable from the unworn background, a result attributed to the formation of a compacted glaze layer under high temperatures and high contact stresses. (C) 2019 Elsevier B.V. All rights reserved.
机译：INCOLOY 800HT和Inconel 617已经被选择作为用于高温气冷反应器（HTGR）的概念候选的结构的合金。氦，主冷却剂，含有杂质（例如，H 2 O和CH 4），其可在高温下，这反过来又可以影响在滑动接触，如阀门和控制杆驱动系统组件的摩擦学行为诱导腐蚀反应。本文展示这两种合金的摩擦磨损性能的研究结果前后调节他们要么不纯氦氧化环境或空气环境。两种合金均在一个通过一次氦循环带4 ppmv的H2O升高的温度下调理了22天，并在升高的温度下与销 - 盘式摩擦磨损试验机在空气环境650摄氏度和750摄氏度的800HT随后测试; 850℃和900℃下为617 - 与各种应用负载 - 1 N，2 N和5 N. SEM-EDS分析表明，调节在氧化环境中的引线的样品混合的Fe / Cr的氧化物上形成合金800HT和合金617的Cr氧化物，相比于作为接收的样本的两个增加的耐磨性。相比，这些合金800HT的合金显示出617较低的稳态摩擦系数。有在条件样品的稳态摩擦系数的散射一个显著降低相比于未调节的试样。对于合金800HT和617的稳态摩擦系数被认为是分别0.53±0.07和0.25±0.04。合金800HT的耐磨性是大约一个数量级比在表现出可测量的磨损所有的情况下合金617的下部。样品调节后，在低负荷下测得的磨损体积为从未磨损的背景下，归因于压实釉层在高温和高接触应力的形成的结果无法区分。 （c）2019 Elsevier B.v.保留所有权利。

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