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Author Mann, B. S.
Source SpringerLink
Content type Text
Publisher Springer US
File Format PDF
Copyright Year ©2013
Language English
Subject Domain (in DDC) Technology ♦ Engineering & allied operations
Subject Keyword diode laser ♦ LP bypass valves ♦ LPST blades ♦ steam turbine ♦ textured X20Cr13 stainless steel ♦ water droplet erosion ♦ Characterization and Evaluation of Materials ♦ Tribology, Corrosion and Coatings ♦ Quality Control, Reliability, Safety and Risk ♦ Engineering Design
Abstract X20Cr13, a martensitic stainless steel, is commonly used for the manufacture of low pressure steam turbine (LPST) moving blades and LP bypass valves of fossil fuel and nuclear power plants. The LPST blades, at present, are laser surface treated to improve their water droplet erosion (WDE) resistance. The laser-treated X20Cr13 stainless steel has improved the water droplet resistance (WDER) several times compared to untreated ones. Further improvements are being carried out by providing a carbide-based HVOF coating having appropriate surface roughness or by creating textured surfaces and treating with a high power diode laser. The surfaces, having appropriate roughness, absorb more laser energy, resulting in improved microstructure, microhardness, modified ultimate resilience, and thicker hardened layer. The WDER of laser-treated textured X20Cr13 stainless steel has improved significantly compared to the untextured ones. The WDE test results of laser-treated textured and untextured X20Cr13 stainless steel along with their microhardness, modified ultimate resilience, microstructure, SEM, and XRD analysis are discussed and reported in this paper. The laser-treated textured X20Cr13 stainless steel is highly suitable for LP bypass valves and LPST blades for achieving a thicker hardened layer with lesser heat input to the components.
ISSN 10599495
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2013-09-04
Publisher Place Boston
e-ISSN 15441024
Journal Journal of Materials Engineering and Performance
Volume Number 22
Issue Number 12
Page Count 9
Starting Page 3699
Ending Page 3707

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Source: SpringerLink