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Improvement in hot corrosion resistance of dissimilar alloy 825 and AISI 321 CO 2 -laser weldment by HVOF coating in aggressive salt environment at 900°C
International Journal of Minerals, Metallurgy and Materials ( IF 4.8 ) Pub Date : 2020-06-15 , DOI: 10.1007/s12613-020-2014-3
S. M. Muthu , M. Arivarasu , T. Hari Krishna , Supriyo Ganguly , K. V. Phani Prabhakar , Saurav Mohanty

This study investigated the hot corrosion performance of a dissimilar weldment of Ni-based superalloy and stainless steel joined by CO2-laser welding and improved by high-velocity oxy-fuel (HVOF) coating in a Na2SO4-60wt%V2O5 environment at 900°C. A dissimilar butt joint of AISI 321 and alloy 825 was fabricated by CO2-laser welding with low heat input after obtaining the optimum welding parameters by bead-on-plate trials. The metallurgical and mechanical properties of the laser weldment were evaluated. The tensile test results indicated the occurrence of fracture in the base metal AISI 321 side. The HVOF process was employed to coat Ni-20wt%Cr on the weldment. To evaluate the surface morphology of the corrosion products formed on the uncoated and Ni-20wt%Cr-coated weldments, scanning electron microscopy (SEM) analysis was performed. Energy-dispersive spectroscopy (EDS) was used to determine the different elements present on the surface scales. The existence of oxide phases on the weldments was determined by X-ray diffraction (XRD). The cross sections of the weldments were characterized by SEM with EDS line mapping analysis. The results indicated that the Ni-20wt%Cr-coated weldment exhibited superior hot corrosion resistance due to the development of Cr2O3 and NiCr2O4 protective oxide scales.



中文翻译:

在900°C的侵蚀性盐环境中通过HVOF涂层改善了不同合金825和AISI 321 CO 2激光焊接的耐热腐蚀性能

这项研究研究了在Ni 2 SO 4 -60wt%V 2中,通过CO 2-激光焊接和高速氧-燃料(HVOF)涂层改善的镍基高温合金和不锈钢的异种焊件的热腐蚀性能。O 5在900°C的环境中。AI 2 321和825合金的对接接头是由CO 2制造的通过板上焊道试验获得最佳焊接参数后,进行低热量输入的激光焊接。评估了激光焊件的冶金和机械性能。拉伸试验结果表明母材AISI 321侧发生了断裂。HVOF工艺用于在焊件上涂覆Ni-20wt%Cr。为了评估在未涂层和Ni-20wt%Cr涂层焊件上形成的腐蚀产物的表面形态,进行了扫描电子显微镜(SEM)分析。能量色散光谱法(EDS)用于确定表面尺度上存在的不同元素。通过X射线衍射(XRD)确定焊件上氧化物相的存在。焊件的横截面通过具有EDS线图分析的SEM进行表征。2 O 3和NiCr 2 O 4保护性氧化皮。

更新日期:2020-06-15
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