摘要
研究了几种合金元素对双相钢时效行为的影响,结果表明:时效过程中,合金元素扩散极为有限;超过70℃时效后拉伸曲线上将出现不连续屈服,出现不连续屈服的时间与所含合金元素的品种有关。计算表明,含 Al,si,Mn,Cr 合金元素的双相钢时效激活能均大于 C、N在铁素体中的扩散激活能,说明时效过程不仅与 C、N 原子在铁素体中的扩散有关,而且和位错的交互作用有关。
Effect of alloying elements on aging behaviour of dual-phase ste-
els was investigated.The experimental results show that diffusion of alloying
elements is negligible during aging.After aging at temperature higher than
70℃,discontinuous yielding is appeared on the stress-strain curve,and the time
for appearing discontinuous yielding is related to variety of alloying elements.
The calculated results show that the activation energy for aging process of
dual phase steels containing Al,Si,Mn,Cr is higher than that for diffusion
of C,N in ferrite.It is suggested that the higher value of activation energy
is not only attributed to the diffusion of C,N in ferrite,but also to the
interaction of C,N atoms with dislocation.
基金
上海市科委青年基金
关键词
双相钢
时效
不连续屈服
dual phase steel
aging
discontinuous yielding
