Evaluation of high temperature corrosion resistance of hybrid welded membrane walls panels joints of austenitic stainless steel

Anna Kamela, Janusz Adamiec

Abstrakt


The growing demands for electricity and UE requirements, regarding the increase in thermal efficiency of power boilers and the reduction of pollution emission to the atmosphere, create a need to modernize the power industry. Raising the parameters of the steam, which increases the thermal efficiency, is one of the ways to meet this requirements. However, achieving a net efficiency of approx. 50% depends on the use of new manufacturing technologies and materials with higher creep resistance than previously used. This article presents the results of high-temperature corrosion resistance test of hybrid welded joints (laser + MAG) of austenitic stainless steel grade 304 used for membrane wall panels. The specimens were placed in an oven in an atmosphere with the composition: N2+9% O2+0.08% SO2 at a temperature of 700 °C and an exposure time of 1000 hours. As a measure of high-temperature corrosion resistance, changes of the mass were adopted. In order to evaluate the oxide layer formed on the surface of the material, the specimens were observed on a scanning electron microscope. The supplement of the research was the chemical (EDS) and phase (XRD) composition analysis. The results confirmed the pres- ence of a layer consisting mainly of Cr2O3 and Fe3O4.


Słowa kluczowe


high-temperature corrosion; membrane panels; stainless steel; hybrid welding laser + MAG

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Bibliografia


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DOI: http://dx.doi.org/10.26628/wtr.v90i7.936

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