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07191 Laser Surface Modification for Improving the Resistance against Intergranular Corrosion of an Austenitic Stainless Steel

Picture for 07191 Laser Surface Modification for Improving the Resistance against Intergranular Corrosion of an
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Product Number: 51300-07191-SG
ISBN: 07191 2007 CP
Author: R. C. Prasad, S. Mahajan, V. Kain, R. Kaul, A.K. Nath, and P. Ganesh
Publication Date: 2007
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$20.00
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Surface modification of type 18/8 stainless steel was carried out using a 3 kW CO2 laser with continuous and pulse wave and with 25%, 50% & 70% overlapping. After laser surface modification, the material was sensitized at 650ºC for 9 hours. The degree of sensitization (DOS) was determined by the double loop electrochemical potentiokinetic reactivation (DL-EPR) test and the susceptibility to intergranular corrosion (IGC) was determined by practice B, A 262, ASTM. The DL-EPR value of base material was 4.52 whereas on the laser modified surfaces it was in the range of 0.11 to 0.91. After the IGC test, the microstructure was examined over the cross section of the sample which revealed much less attack on laser melted side compared to the base material. X-ray diffraction revealed presence of about 4% ferrite in the laser melted regions. As sensitization is mainly a grain boundary phenomena, the nature of grain boundaries were examined by orientation imaging microscopy (OIM). The results are discussed to explain the reasons for the low DL-EPR values on the laser melted surfaces. The present study demonstrates a clear possibility of remarkable improvement in DOS and resistance to IGC by laser surface modification.
Surface modification of type 18/8 stainless steel was carried out using a 3 kW CO2 laser with continuous and pulse wave and with 25%, 50% & 70% overlapping. After laser surface modification, the material was sensitized at 650ºC for 9 hours. The degree of sensitization (DOS) was determined by the double loop electrochemical potentiokinetic reactivation (DL-EPR) test and the susceptibility to intergranular corrosion (IGC) was determined by practice B, A 262, ASTM. The DL-EPR value of base material was 4.52 whereas on the laser modified surfaces it was in the range of 0.11 to 0.91. After the IGC test, the microstructure was examined over the cross section of the sample which revealed much less attack on laser melted side compared to the base material. X-ray diffraction revealed presence of about 4% ferrite in the laser melted regions. As sensitization is mainly a grain boundary phenomena, the nature of grain boundaries were examined by orientation imaging microscopy (OIM). The results are discussed to explain the reasons for the low DL-EPR values on the laser melted surfaces. The present study demonstrates a clear possibility of remarkable improvement in DOS and resistance to IGC by laser surface modification.
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