本文關鍵詞：中間層及熱處理對熱軋鈦—鋼復合界面組織及結合性能的影響研究　出處：《鋼鐵研究總院》2017年碩士論文　論文類型：學位論文

  更多相關文章： 熱軋鈦-鋼復合板 中間層 熱處理 界面結構 剪切強度

【摘要】：熱軋鈦-鋼復合板結合了鈦耐蝕、密度小、比強度高及鋼材較好的強度性能特點,在海洋工程、石油化工等領域應用前景廣闊�，F(xiàn)有關于熱軋鈦-鋼復合板的研究,大多是探究軋制工藝參數(shù)對復合界面組織性能的影響,也有不少學者研究了Cu、Ni等中間層材料對復合界面的影響,但對Nb中間層、Nb+Ni雙中間層的討論較少。本文使用真空熱軋復合法制備以Nb作中間層及Nb+Ni作雙中間層的Q235-TA2復合板,利用OM、SEM觀察復合界面顯微結構,結合SEM-EDS說明復合界面元素擴散情況;通過壓剪實驗表征復合界面結合性能,并利用XRD結果對壓剪斷口進行物相分析。全文主要內(nèi)容如下:首先分析了中間層對熱軋鈦-鋼復合板復合界面的影響。軋制溫度為875 ℃時,Nb中間層試樣壓剪強度最高(280 MPa),Nb+Ni雙中間層試樣次之(239 MPa),無中間層試樣最低(231 MPa)。Nb中間層試樣Q235-Nb界面存在Fe2Nb,壓剪試樣在Q235-Nb界面處發(fā)生斷裂;Nb+Ni雙中間層試樣Nb-Ni界面存在Ni3Nb層及沿界面少量分布的微孔,壓剪試樣在Nb-Ni界面處發(fā)生斷裂;無中間層試樣Q235-Ti界面存在脆性TiC,壓剪試樣在Q235-Ti界面發(fā)生斷裂。當軋制溫度為925 ℃時,Nb中間層試樣壓剪強度仍高于Nb+Ni雙中間層試樣壓剪強度。同軋制溫度為875 ℃時的試樣相比,軋制溫度為925 ℃時Nb及Nb+Ni雙中間層試樣壓剪強度均降低。Nb中間層試樣Q235-Nb界面處脆性Fe2Nb相生成量增加,并伴隨新相FeNb的生成。Nb+Ni雙中間層試樣Nb-Ni復合界面微孔尺寸增大數(shù)量增加,Ni3Nb金屬間化合物層寬度增厚。其次,分別討論正火及高溫回火熱處理對無中間層試樣復合界面的影響。經(jīng)650 ℃高溫回火及900 ℃正火熱處理后,試樣壓剪強度分別為138 MPa及143 MPa,試樣Q235-Ti界面近Q235側(cè)形成薄膜狀TiC層,TiC厚度較軋態(tài)顯著增加。高溫擴散導致TiC層厚度增加是復合界面結合強度降低的主要原因。最后討論熱處理對Nb中間層試樣復合界面的影響。高溫回火試樣Q235-Nb界面微孔的存在使得其壓剪強度(162 MPa)略低于正火試樣壓剪強度(171 MPa)。高溫回火及正火處理后,Q235-Nb界面均生成Fe2Nb,正火態(tài)試樣Nb-Ti界面存在α-Ti+β-Ti兩相混合組織。不同熱處理條件下,試樣壓剪過程中均在Q235-Nb界面處發(fā)生斷裂,Q235-Nb界面結合強度弱于Nb-Ti界面結合強度。
[Abstract]:Hot rolled Ti-steel composite plate combines the characteristics of titanium corrosion resistance, low density, high specific strength and better strength performance of steel in offshore engineering. The current research on hot rolled Ti-steel composite plate is mostly to explore the effect of rolling process parameters on the microstructure and properties of composite interface, and many scholars have also studied Cu. The effect of Ni and other interlayer materials on the composite interface, but on NB interlayer. There is little discussion about the double interlayer of NB and Ni. In this paper, the Q235-TA2 composite plate with NB as the interlayer and NB Ni as the double interlayer is prepared by vacuum hot rolling method, and OM is used. The microstructure of the composite interface was observed by SEM and the diffusion of elements at the composite interface was explained by SEM-EDS. The bonding properties of the composite interface were characterized by compression and shear experiments. The main contents of this paper are as follows: firstly, the effect of interlayer on the composite interface of hot-rolled Ti-steel composite plate is analyzed. The rolling temperature is 875 鈩，

本文編號：1399268