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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] Õâ¶Î»°µÄÖ÷ÒªÒâ˼ÊÇ£¿£¿ ÔÚÏߵȣ¬¼±Ñ½¡£ |
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