著者

小藪 重行

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.29, no.1, pp.54-67, 1943-01-25

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The principal causes of erosion in the gun-barrel bore are cracks and the deterioration caused by the action of the gun-powder gas, as well as abrasion due to projectiles passing through. The author investigated microspically and by X-rays the cracks and the characteristic-layer on the eroded surface of the bore. It was ascertained that the characteristic layer has a structure which has become martensitic due to the heating effect of the gun-powder gas. At the instant of discharge, the barrel, expands and contracts, and also the hard layer itse'f does so due to the heating effect of the gun-powder gas, so that innumerable number of cracks occurs on that layer by repetition of such actions. The gun-powder gas penetrates through these cracks and accelerates the erosion. Thus it was concluded that the action of the gun-powder gas is the fatal cause of the deformation of the bore by erosion.