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F. Warchomicka:
"Microstructural observation of a duplex stainless steel liner (Canada)";
Report No. Oktober, 2011; 10 pages.

Microstructural investigations were carried out in two different places of a inlet cylinder of a duplex stainless steel F51 in order to observe damage on the surface after several detonations during service in Canada. The top and bottom of the cylinder were extracted to be analysed by microscopy, obvserving a significant difference on the thickness of the cylinder wall. Microstructure observations and hardness measurements determine not significant microstructural changes in both parts. An increment in the hardness values near to the inner wall could be related to the effect on the microstructure of the temperature inside the chamber and the cooling rates. The difference in thickness of the liner wall (almost 3mm between both extremes) could be related to a strong erosion of the surface during the service.

microstructure, thermal shock damage, modified High Energy Rate Forming, duplex stainless steel