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seven_nana 发表于 2013-1-12 14:44 
我也支持这个看法
以前见到过一种说法,说在重巡装甲这一级别上,美国的Class A是最好的
U.S. Navy BETHLEHEM THIN CHILL Class "A" armor (see below) was unusual in that it had essentially no deep face layer, with the drop in hardness being so steep behind the cemented layer that the cemented layer itself became the entire face and only a narrow, very steep transition layer not much thicker than the cemented layer connecting the cemented layer with the back layer, while U.S. Navy MIDVALE NON-CEMENTED Class "A" armor (see below) had a extreme chill depth of over 80% of the plate. The depth of the chill (actually the thickness of the unhardened back layer as a percent of the total plate thickness) is important not only for damaging projectiles, but also because the hard chill always fails by breaking (brittle fracture) and this is a surface phenomenon, as opposed to ductile tearing, where the entire volume of armor is distorted and pushed aside by the projectile as it penetrates (see SCALING on page 3). Due to the difficulty of precisely controlling temperature and due to the use of the circa-1"-thick cemented surface layer in most KC-type armors, the minimum plate thickness for the deep face process described above was usually circa 4" (102mm) or greater (6" (15.2cm) for Japanese World War I-era VICKERS CEMENTED armor, for example), though Krupp and Witkowitz originally made their KC armors down to 3.2" (8cm) up through the end of World War I--even they increased the minimum to 4" after World War I.
看清楚里面写的没有什么足够厚度的渗碳层这个说法是整个装甲厚度中有近80%经过快速冷却的淬火 |
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