溶接凝固機構とその組織の特性(第 5 報) : 単結晶のアルミニウム溶接部における Stray Crystal の発生に対する結晶学的検討

概要

論文の詳細を見る
Byx-ray diffraction technique the conditions for origination and the crystallographic chracteristics of the new columnar crystal (that is, stray crystal) in TIG weld bead have been investigated using single crystal of commercially pure (1S) and 99.93% pure aluminum 1mm thick sheets. Conclusions obtained are as follows : (1) Origination of new columnar crystal which was called as "stray crystal" by authors was confirmed by means of TIG bead-on-plate welding on single crystal of commercially pure aluminum sheet. (2) Stray crystal originates when the direction of the maximum temperature gradient at the solidliquid interface of the columnar crystal growing from the fusion boundary deviates from the nearest <100> direction by 40∿50 degrees. (3) The origination of the stray crystal is seen to be related with the purity of the material. Namely the decrease of the purity in the base metal genarally urged the origination of the stray crystals in the weld bead (4) A <100> direction of the stray crystal usually coincides with the direction of the maximum temperature gradient at the originating interface. Moreover the subgrains inside the each stray crystal are parallel with a <100> direction.
社団法人溶接学会の論文
1971-03-25