B0594 Mathematical modelling of weld phenomena 2 by H. K. D. H. Bhadeshia, H. Cerjak

By H. K. D. H. Bhadeshia, H. Cerjak

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F 100 1000 (mrri/s) vs tip velocity for an Fe-15Ni-15Cr alloy Up to now only the dominant effect of the growth rate on microstructures has been discussed. e. when G I v> A To / D. Therefore, at the bottom of the weld pool where GIV is tending to infinity, a planar front may be observed. However, diffusional transient phenomena will often inhibit formation of this morphology. DENDRITE GROWfH IN WELDS Dendritic growth occurs along selected directions. These are generally low index directions of the underlying crystal structure such as (100) in cubic materials.

Thus the results are only of a qualitative nature. 32 Mathematical Modelling of Weld Phenomena 2 z I+-A Ipo--- z Arf'in} orcement A-A y Figure 9. Mass balance for pool surface calculation. 5; 1 = 0°; 30°; 60° plate thickness 4. 0066 mz's average arc pressure Pare = 300 Pa energy input C2eff = 1500W The energy input according to Equation 5 also covers the part of energy of the filler metal. In Figs 10 and 11 transverse section drawings heavily stretched in the direction of z are shown for the plane y = O.

Appl. 72, 3317-3322. SA. DAVIDand T. Science, 1992, 257, 487-502. K. MUNDRA and T. Unpublished research, Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA. R. R. A. ), ASM Publications, Metals Park, OH, 1982, pp. 489-515. A. BROWER R. C. FLEMINGS: AFS Cast Metals Research Journal, Dec. 1970, 35. 36. 37. 38. 39. 40. ABDULGADAR:Ph. D. Thesis, The Pennsylvania State University, University Park, PA. D. PEHLKE: Unit Processesin Extractive Metallurgy, Elsevier, New York, 1979.

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