EFFECT OF SUPERSONIC WAVES ON VARIO US CHANGES OF STEEL AT HIGH TEMPERATURE
1951 Volume 37 Issue 10 Pages 527-532
Details
1951 Volume 37 Issue 10 Pages 527-532
Effect of supersonic waves on the various changes of steel was studied at high temperatures. The specimens used in the experiments were 1.2% carbon steel strip and the supersonic waves of 100 K.C. were propagated by the magneto-striction vibrater from one end of the specimen to the other which was put into the electric furnace and heated to temperatures required. The results obtained were as follows.
(1) It was found in the thermal analysis that transformation was remarkably accelerated.
(2) Some spots of troostite were found in martensite layer at almost fixed places, grain growth was not uniform, and the so called mixed grain structure was obtained. The phenomena were probably caused by interference of the supersonic waves.
(3) The distribution of cementite was not uniform and coagurated in grain boundaries or other parts.
(4) Oxydation and decarburization in air at high temperature was remarkably accelerated.
