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[ÇóÖú] ÈçºÎ·­Òëmany variants of cementite ÒÑÓÐ1È˲ÎÓë

The question then arises as to whether these grains are autotempered martensite or a variant of
bainite. It used to be thought that tempered or autotempered martensite shows many variants of
cementite whereas there is only a single variant present in lower bainite. However, it has been
shown that this is not generally true and that there are many circumstances where multiple vari-ants occur in lower bainite [21¨C23] and single variants in martensite [20]
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