【摘要】：利用光學(xué)顯微鏡(OM)、X射線衍射儀(XRD)、掃描電鏡(SEM)、透射電鏡(TEM)結(jié)合析出動(dòng)力學(xué)和沖擊實(shí)驗(yàn),研究了不同Mn含量(4.3%,6.9%,9.7%,質(zhì)量分?jǐn)?shù),下同)對(duì)22%Cr節(jié)鎳型雙相不銹鋼700℃時(shí)效析出相形成和韌性的影響。結(jié)果表明:隨Mn含量由4.3%增加至9.7%,時(shí)效76h,析出形貌分別為鐵素體/奧氏體(δ/γ)界面細(xì)小σ相顆粒析出和鐵素體晶內(nèi)σ相/二次奧氏體(γ_2)共析組織。Mn含量增加使Avrami指數(shù)n減小,反應(yīng)常數(shù)B增大,Mn元素參與并促進(jìn)σ相析出,σ相開始析出和完全析出時(shí)間均提前,開始析出與完全析出的時(shí)間間隔增大,析出速率降低。時(shí)效過程中δ相分解量低于1%(體積分?jǐn)?shù),下同)對(duì)沖擊韌度影響不大,δ相分解量由1%增至5%會(huì)顯著降低沖擊韌度。Mn含量增加在時(shí)效前期對(duì)沖擊韌度有利,時(shí)效中期則會(huì)促使δ相分解量更早超過1%,導(dǎo)致沖擊韌度快速下降。
[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，

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