<正> 大森等和Habraken曾分别研究了低碳低合金钢中出现的B_Ⅰ型、B_Ⅱ型、B_Ⅲ型贝氏体和粒状贝氏体的特点和形态。我们对低碳Mn-Nb-V和Mn-Mo-Nb-V钢中的贝氏体进行光学显微镜和透射电子显微镜观察,研究贝氏体形态和转变。 试验用钢用感应炉冶炼,锻成直径15 mm的圆棒,经退火加工成直径12mm厚2mm的片试样。其化学成分如下(wt-％):
Isothermal transformation of austenite to bainite of different merphologies in somelow carbon Mn-Nb-V and Mn-Mo-Nb-V steels was investigated.The experimentel results showed thatboth granular and featherlike bainite formed over the bainitic transformation temperature range anddid not contain carbide. The granular bainite with non-directional islands formed in the hightemperature range of bainitic transformation, the granular bainite with directional islands formedin the medium temperature range. The bainite which formed in the lower temperature range istypically featherlike. But it was found that the carbon-rich austenite islands, Present betweenferrite laths, transformed to martensite on cooling. Acicular lower bainite was not observed inthe steels.
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