溶接凝固機構とその組織の特性(第2報)
アルミニウムのサブグレインの形成組織とその結晶学的性質
1970 年 39 巻 7 号 p. 644-651
詳細
1970 年 39 巻 7 号 p. 644-651
A bead-on-plate welding was done on each specimen of aluminum single crystals (purity: 99.93%, size: lt×20×200) with TIG arc or electron-beam. Optical and X-ray diffractive investigations were made on.the structures and crystallographic properties of subgrains which had been developed in the weld metal. The conclusions obtained are as follows;
(1) Subgrains are observed in the weld metal and they tend to grow in the direction of ‹100›.
(2) Crystals in the weld metal do not always grow in the direction normal to the weld isotherm.
(3) Mean widths of subgrains tend to decrease when the growth rate increases.
(4) Mean valuess of misorientations between subgrains decrease when the welding speed increases.
(5) Mean dislocation. densities in subgrains which were calculated from'the values of the misorientations and the widths of subgrains were almost the same as the results which had been reported by T.S. Noggle and J.S. Koehler in the case of the melt-grown specimens of 99.99% aluminum.
