Mn对22%Cr双相不锈钢700℃时效σ相及韧性的影响
发布时间：2019-03-19 08:45
【摘要】：利用光学显微镜(OM)、X射线衍射仪(XRD)、扫描电镜(SEM)、透射电镜(TEM)结合析出动力学和冲击实验,研究了不同Mn含量(4.3%,6.9%,9.7%,质量分数,下同)对22%Cr节镍型双相不锈钢700℃时效析出相形成和韧性的影响。结果表明:随Mn含量由4.3%增加至9.7%,时效76h,析出形貌分别为铁素体/奥氏体(δ/γ)界面细小σ相颗粒析出和铁素体晶内σ相/二次奥氏体(γ_2)共析组织。Mn含量增加使Avrami指数n减小,反应常数B增大,Mn元素参与并促进σ相析出,σ相开始析出和完全析出时间均提前,开始析出与完全析出的时间间隔增大,析出速率降低。时效过程中δ相分解量低于1%(体积分数,下同)对冲击韧度影响不大,δ相分解量由1%增至5%会显著降低冲击韧度。Mn含量增加在时效前期对冲击韧度有利,时效中期则会促使δ相分解量更早超过1%,导致冲击韧度快速下降。
[Abstract]:Different Mn contents (4.3%, 6.9%, 9.7%) were studied by means of optical microscope (OM), X-ray diffractometer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) (TEM) combined with precipitation kinetics and impact test. The effect of mass fraction on the formation and toughness of precipitated phase at 700 鈩，
本文编号：2443372
[Abstract]:Different Mn contents (4.3%, 6.9%, 9.7%) were studied by means of optical microscope (OM), X-ray diffractometer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) (TEM) combined with precipitation kinetics and impact test. The effect of mass fraction on the formation and toughness of precipitated phase at 700 鈩，
本文编号：2443372
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