EBSD Analysis and Hot Tensile Properties of Pulsed Current Gas Tungsten Arc Welded Super 304h Austenitic Stainless Steel Joints
Super 304H austenitic stainless steel tubes containing 2.3 to 3 (%wt) of Cu is mainly used in superheaters and reheater of ultra-supercritical boilers. Welding high alloyed steels such as stainless steels can result in local variation of alloying elements within the weld metal and such segregation may affect the high temperature properties of the weld joint. It is preferable to control the solidification structure of the weld by altering the prevailing thermal gradients in the weld pool during welding. The effect of current pulsing on microstructure and hot tensile properties of filler added gas tungsten arc welding (GTAW) of super 304H is studied. Current pulsing is found to be beneficial in improving the hot tensile properties of super 304H GTAW joints at all test temperature, which is attributed to the grain refinement, increase in frequency of high angle grain boundaries, reduced segregation and finer carbonitrides precipitation.
The need to increase the efficiency of the power plants and thereby to achieve, reduction in Co2 emissions can be attained by increasing the parameters of steam cycles. The main challenge in building power plants with advanced steam cycles is the availability of construction materials. Newer alloys are being developed and identified for the requirement of such power plants with advanced steam cycles. In such effort, super 304H stainless steel is proposed for use in super heater and reheater tubings of ultra-supercritical boilers. Super 304H is capable of operating in steam temperatures of about 600°C, with excellent resistance corrosion and creep. Super 304H with addition of 2.3 to 3 (% wt) of Cu results in increased creep strength of the alloy, offered by the fine, stable, coherent Cu-rich precipitates evolve during exposure to creep conditions.
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