Record Details

Formation of high chromium surface alloys on 2.25Cr-1Mo and 9Cr-1Mo steels using a single step laser treatment to improve their high temperature oxidation corrosion resistance

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title Formation of high chromium surface alloys on 2.25Cr-1Mo and 9Cr-1Mo steels using a single step laser treatment to improve their high temperature oxidation corrosion resistance
 
Creator KHANNA, AS
STREIFF, R
WISSENBACH, K
 
Description Laser surface alloying (LSA) is becoming an important tool for modifying the surface composition of various relatively reactive substrates for enhancing their oxidation/corrosion resistance. In the present work, heat-exchanger materials, namely 2.25Cr-1Mo and 9Cr-1Mo steels were modified by a single-step LSA using a 3 kW CO(2) laser in continuous mode to achieve an increased chromium and nickel concentration at the surface. A 50% Ni + 50% Cr powder with particle size ranging between 22-45 mu m was fed simultaneously with a feed rate of 2 to 2.8 gm/min using a line focus mode with a spot size of 2 mm. Various samples were obtained by varying the sweep rate from 500 to 1000 mm/min. The surface morphology, composition and cross-section of the laser melted zone of LSA samples were analysed using optical microscopy, X-ray diffraction and SEM/EDAX. Various samples were subjected to oxidation tests at 800 degrees C in air and aqueous corrosion tests in 1N H(2)SO(4) and 3.5 % NaCl solutions, followed by the analysis of corrosion products. An attempt was made to compare the results on the surface composition, microstructure, corrosion and oxidation with the alloys with similar composition, made earlier using a two-step LSA.
 
Publisher MINERALS, METALS & MATERIALS SOC
 
Date 2011-10-27T08:56:37Z
2011-12-15T09:12:27Z
2011-10-27T08:56:37Z
2011-12-15T09:12:27Z
1999
 
Type Proceedings Paper
 
Identifier ELEVATED TEMPERATURE COATINGS: SCIENCE AND TECHNOLOGY III,399-417
0-87339-421-6
http://dspace.library.iitb.ac.in/xmlui/handle/10054/16242
http://hdl.handle.net/100/2679
 
Source Symposium on Elevated Temperature Coatings - Science and Technology III, at the 1999 TMS Annual Meeting,SAN DIEGO, CA,FEB 28-MAR 04, 1999
 
Language English