Si在一定含量范围内,使低碳贝氏体钢中粒状贝氏体相对量、M—A岛体积分数、残余奥氏体量及其稳定性增加,从而提高钢的强度和韧性。在v_t=156℃/min冷速下,Si为1.62％时,钢的强韧性出现极大值;v_t=7.9和0.9℃/min时,Si>1.99％后,大量共析铁素体的析出降低了钢的强度和韧性,Si为1.99％时,强韧性最高,最佳Si含量为1.62—1.99％。
Improvement on strength and toughness of low carbon bainitic steels may bemade by Si addition within a finite content range to increase the relative amount of granularbainite, the volume fraction of M-A island, the amount of retained austenite and its mechani-cal stability. Their strength and toughness may be at its maximum at cooling ratev_t=156℃ /min if 1.62% Si added, and may decrease due to precipitation of a host ofpro-eutectoid ferrite if Si>1.99% at v_t=7.9 and 0.9℃ / min. The peak value of strengthand toughness occurs while the Si content equal to 1.62 or 1.99% respectively. It is believedthat the best Si content is 1.62--1.99% for low carbon bainitic steels.
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