Book ChapterDOI
Laser surface modification of steel for slurry erosion resistance in power plants
R.C. Shivamurthy,M. Kamaraj,Rajarathinavelu Nagarajan,S.M. Shariff,G. Padmanabham +4 more
- pp 177-287
TLDR
In this article, the microstructure and slurry erosion characteristics of laser surface alloyed coatings that are used to mitigate the erosion issues of 13Cr-4Ni martensitic stainless steel are discussed.Abstract:
This chapter discusses the microstructure and slurry erosion characteristics of laser surface alloyed coatings that are used to mitigate the erosion issues of 13Cr–4Ni martensitic stainless steel. The chapter first describes the present scenario of surface modification methods, such as conventional welding, surface hardening/nitriding, external coatings, etc., which are being utilized to minimize the silt erosion problems of components in hydropower plants. The chapter also explains newer coating methods, such as laser surface alloying. It then describes the usefulness towards erosion mitigation in hydropower plant applications of laser surface alloying of 13Cr–4Ni steels with commercial coating powders such as Colmonoy 88 and Stellite 6. Erosion performances of coatings and substrates are evaluated using a slurry jet erosion test-rig with various parameters, using commercial silica sand and river sand. An evaluation of the effect of boron carbide addition on the erosion performances of laser surface alloyed coatings is given. An attempt has also been made to correlate the quantitative results (erosion performances) with qualitative results (erosion mechanisms) by extensive studies of eroded samples using scanning electron microscopy. By the end of the chapter, a correlation between measured and predicted erosion rates has been established in power-law formulation.read more
Citations
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Journal ArticleDOI
Performance of different coating materials against slurry erosion failure in hydrodynamic turbines: A review
TL;DR: In this article, the performance of modified surfaces, which have been developed by using various surface engineering techniques to combat the slurry erosion failure in hydrodynamic turbines, is reviewed and the evaluation of enhancement in the coating characteristics (mechanical and micro-structural) as well as coating efficiency under different slurry degradation conditions are reported.
Journal ArticleDOI
Processing and Advancements in the Development of Thermal Barrier Coatings: A Review
Amrinder Mehta,Hitesh Vasudev,Sharanjit Singh,Chandra Prakash,Kuldeep K. Saxena,Emanoil Linul,Dharam Buddhi,Jinyang Xu +7 more
TL;DR: In this paper , the authors present a high-level overview of the many coating processes and design procedures employed for thermal barrier coatings to enhance the coating's surface quality, focusing on the cultivation, processing and characteristics of engineered TBCs.
Journal ArticleDOI
Studies on Enhancement of Silt Erosion Resistance of 13/4 Martensitic Stainless Steel by Low-Temperature Salt Bath Nitriding
Guru Prakash,S. K. Nath +1 more
TL;DR: In this article, the nanohardness and elastic modulus of the cross section of a nitrided 13/4 Martensitic stainless steel (13/4HTT) were measured by nanoindentation test using Hysitron TI950 triboindenter.
Journal ArticleDOI
Design of ultra-high temperature ceramic nano-composites from multi-scale length microstructure approach
TL;DR: In this article, the evolution of the multi-scale microstructure of a (Zr,Ta)B2 solid solution was studied as a function of time and temperature, and phase stability diagrams were used to define the conditions of partial pressure within the sintering chamber that drove precipitation of nanoinclusions in the form of either metal or carbide.
Journal ArticleDOI
Effect of plasma nitriding process on the fatigue and high temperature corrosion resistance of Inconel 740H nickel alloy
Mateusz Kopeć,Dominika Gorniewicz,Dominik Kukla,Izabela Barwinska,Stanisław Jóźwiak,R. Sitek,R. Kowalewski +6 more
TL;DR: In this paper , a comparison of microhardness, fatigue and high temperature corrosion of Inconel 740H nickel alloy in its as-received state and the same material with nitrided surface layers was presented.
References
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Book
Laser Material Processing
TL;DR: In this paper, the effect of reflectivity of the surface, when a pure, monochromatic laser (6) is used, is remedied by the simultaneous application of a relatively shorter wavelength beam (1).
Book
Introduction to Tribology
Bharat Bhushan,Pak Lim Ko +1 more
TL;DR: In this article, the authors present a theory of the real area of contact (ROC) between two surfaces and show that the ROC can be represented as a triangle of a triangle.
Journal ArticleDOI
A study of erosion phenomena part I
TL;DR: In this article, the authors derived an expression for the energy needed to remove a unit volume of material from the body surface and described the plastic-elastic behaviour of the substance.
Journal ArticleDOI
Some observations on the erosion of ductile metals
TL;DR: In this paper, the effect of some of these variables may be predicted on simple fundamental grounds, and quantitative predictions may be made for the erosion of ductile metals by hard abrasive grains which strike at grazing angles.
Journal ArticleDOI
Laser processing of materials
J. Dutta Majumdar,Indranil Manna +1 more
TL;DR: An overview of laser-assisted forming, joining, machining and surface engineering can be found in this paper, where a review of the relevant literature is presented to highlight the recent advances and open questions.
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