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Characterisation and corrosion-erosion Behaviour of Carbide based Thermal Spray Coatings

Journal of Minerals and Materials Characterization and Engineering 2012年第6期11卷 569-586页

作者： Sukhpal Singh Chatha Hazoor S. Sidhu Buta S. Sidhu Punjab Technical University Jalandhar Punjab-144601 India Yadavindra College of Engineering Punjabi University Guru Kashi Campus Talwandi SaboBathinda Punjab-151302 India

Thermal spraying has emerged as a suitable and effective surface engineering technology and is widely used to apply wear, erosion and corrosion protective coatings for various kinds of industrial applications. Cr3C2-based coatings have been applied to a wide range of industrial components. Cr3C2-NiCr coatings offer greater corrosion and oxidation resistance, also having a high melting point and maintaining high hardness, strength and wear resistance up to a maximum operating temperature of 900 °C. The corrosion resistance is provided by NiCr matrix while the wear resistance is mainly due to the carbide ceramic phase. This paper reviews the performance, developments and applications of Cr3C2-NiCr thermal spray coatings for corrosion/erosion-corrosion under different types of environments and outlines the characterization of Cr3C2-NiCr coatings with respect to their microstructure and mechanical properties, together with some brief characterisation work by the author for HVOF sprayed 75Cr3C2-25NiCr coating on T91 boiler steel.

关键词： Thermal spray Microstructure Mechanical properties corrosion-erosion Cr3C2-NiCr

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Metallurgical Forensics: Investigating a Superheater Tube Failure in Industrial Process Plants

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World Journal of Engineering and Technology 2024年第3期12卷 742-758页

作者： Kok Toong Leong Engineering Department QSM Associates Singapore

A metallurgical forensic investigation was conducted to determine the cause of a failed superheater tube. Analysis techniques by Visual Examination, Energy Dispersive X-ray Analysis, Mechanical Testing and Metallographic Investigation were conducted, together with a comparative study from an inlet elbow section that did not fail. The superheater tube suffered premature failure after being in service for about two years. It was concluded that the failed tube underwent overheating, corrosion-erosion, embrittlement, and eventual failure under its internal pressure by stress rupture. The analysis revealed intergranular cracks, window fracture features and spheroidization of pearlite with grain growth. A possible contribution to embrittlement was from copper. Follow-ups and recommendations were provided, as well as covering materials, inspection, and operational considerations.

关键词： Superheater Tubes Thermal Degradation corrosion-erosion Embrittlement Stress Rupture

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