爆発圧接金属のミクロ組織の透過電子顕微鏡による観察(第 1 報) : 軟鋼クラッド鋼およびオーステナイト系ステンレスクラッド鋼について

概要

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Microstructure of explosively bonded composites, low carbon-steel to low carbon-steel and austenitic stainless steel to low carbon-steel, has been investigated by transmission electron microscopy. The bond zone whose width is less than several μ consists of a mixture of a clad metal and a base metal, and the small crystal grains in each component metal are several thousand Å in size. Both areas within about 10μ from the bond zone are composed of either small crystal grains or elongated grains of several thousand Å width. Dislocation density in these areas as well as the bond zone is of the order of (10)^9/(cm)^2. Larger crystal grains at distance of 10-600μ from the bond zone has a dislocation density of (10)^<10>-(10)^<11>/(cm)^2,and the dislocation density at further increased distance is (10)^9-(10)^<10>/(cm)^2. There exist tangled dislocations with cusps, dislocation loops and undeveloped cell structure. Thin deformation twins in austenitic stainless steel and elongated subgrains resulting from α⇾ε⇾α transformation of low carbon-steel are observed profusely. No significant hcp ε-phase is detected in the stainless steel. The adequacy of the proposed mechanism of the explosive bonding based on the theory of compressible fluid is discussed from the result obtained.
社団法人溶接学会の論文
1973-06-25