Features of Behavior of Persian Damascus Steel of Xviii Century and Contemporary Damascus Steel With Cyclic Loading

被引:0
|
作者
D. A. Sukhanov
机构
[1] ASK-MSC (Metallurgy) Company,
来源
Metallurgist | 2022年 / 66卷
关键词
Damascus steel; cyclic crack resistance; viability;
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摘要
It is shown that the ancient Damascus structure of a Persian blade differs in composition and nature of the separation of layers from the multilayer structure of contemporary welding Damascus steel. Structural analysis of the step-by-step transformation of the cellular distribution of excess carbides within separate layered conglomerates, represented by a genuine Damascus troostite-carbide structure (65/35), has been performed on Damascus steel. In specimens of contemporary welding Damascus steel a stepwise process has been performed for transformation of ferrite-pearlite (40/60) structures into ferrite-martensite (30/70) structures. Continuous ferritic layers are transformed into accumulations of isolated recrystallized ferritic grains. Values of threshold stress intensity coefficient (∆Kth) are determined graphically, with which a fatigue crack does not propagate over the extent of a prescribed number of cycles. A critical value is recorded for stress intensity coefficient (∆Kfc) with which knife blades are broken. Behavior of a kinetic diagram linear section of the kinetic fatigue failure diagram (KFFD) is evaluated. In welding Damascus steel over a linear section areas of delayed fatigue crack growth are observed due to local delamination ahead of its front.
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页码:724 / 735
页数:11
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