Abstract
The microstructure in weldments of HT-9, a commercial 12Cr-1Mo ferritic steel, has been observed to vary over short distances as a function of the varying thermal history during welding. The mechanical behavior response of “local” weldment microstructures can be characterized by simulation of the structure in larger usable volumes of material, if the “local” thermal history during welding is known. An empirical equation for describing the thermal history of HT-9 weldment heat-affected zones during gas tungsten-arc welding is presented in this paper. Peak temperatures and cool-down cycles are both predictable at any location in the base metal heat-affected zone for welding of plate under conditions of two-dimensional heat flow anticipated for first wall component fabrication. Power input and preheat effects are included in the equation. The equation is expected to apply to materials having a chemistry and thermal properties similar to HT-9. This includes low activation alloys based on the composition of HT-9.
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