High Temperature Corrosion Behavior of Eutectic Structured NiAl-34Cr and NiAl-28Cr-6Mo Alloys Produced by Electric Current Activated Sintering

Academic Platform Journal of Engineering and Science Pub Date : 2021-01-29 DOI:10.21541/APJES.708253

C. Çeper, N. Ergin, Ö. Özdemir

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Abstract

In this study, NiAl-34Cr and NiAl-28Cr-6Mo eutectic alloys were produced by electric current assisted sintering (ECAS) method in a 3500-4200 A current range with a waiting time of 47 minutes. Phase examinations of the obtained samples were carried out with the help of X-ray diffraction analysis (XRD). While determining NiAl and Cr phases in NiAl-34Cr alloy from XRD patterns; It was determined that NiAl-28Cr-6Mo alloy consists of two phases, together with Mo residues, NiAl and CrMo. According to the Archimed principle, the relative density of NiAl-34Cr and NiAl-28Cr-6Mo alloys was determined as 96.2%, 97.9% respectively. The hardness values of NiAl-34Cr and NiAl-28Cr-6Mo samples were approximately 275 ± 13 HB and 255 ± 20 HB detected. In addition, the corrosion properties of the samples were examined by hot corrosion tests at 800, 900 and 1000°C for 165 hours (15 cycles) in 25% wt. K2SO4 + 75% wt. Na2SO4 salt medium. Weight changes, microstructure (SEM-EDS) and phase analysis of the samples after corrosion were carried out, and the corrosion properties of NiAl-34Cr alloy were found to be better compared to the Mo-added alloy. Ö ÖZDEMİR Academic Platform Journal of Engineering and Science 9-1, 79-85, 2021 80

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电流激活烧结共晶结构NiAl-34Cr和NiAl-28Cr-6Mo合金的高温腐蚀行为

本研究采用电流辅助烧结(ECAS)方法，在3500 ~ 4200a电流范围内制备了NiAl-34Cr和NiAl-28Cr-6Mo共晶合金，等待时间为47分钟。用x射线衍射分析(XRD)对所得样品进行了物相分析。用XRD谱图测定NiAl- 34cr合金中NiAl和Cr相结果表明，NiAl- 28cr - 6mo合金由Mo残基NiAl和CrMo两相组成。根据Archimed原理，确定了NiAl-34Cr和NiAl-28Cr-6Mo合金的相对密度分别为96.2%和97.9%。NiAl-34Cr和NiAl-28Cr-6Mo试样的硬度值分别为275±13 HB和255±20 HB。此外，通过在25% K2SO4 + 75% Na2SO4盐介质中，在800、900和1000℃下进行165小时(15个循环)的热腐蚀试验，考察了样品的腐蚀性能。通过对腐蚀后试样的重量变化、微观组织(SEM-EDS)和物相分析，发现NiAl-34Cr合金的腐蚀性能优于添加mo的合金。Ö ÖZDEMİR学术平台工程与科学学报9-1,79-85,2021 80

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Academic Platform Journal of Engineering and Science

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