(中南大學(xué) 粉末冶金研究院，長沙 410083)
摘 要: 采用有限元法分析鎢/鋼擴(kuò)散焊接頭殘余應(yīng)力，并探討添加釩/鎳和釩/銅復(fù)合中間層對鎢/鋼擴(kuò)散焊接頭殘余應(yīng)力分布的影響。結(jié)果表明：鎢/鋼擴(kuò)散焊接頭存在較大的殘余應(yīng)力，靠近中間層附近的鎢處存在極大的徑向壓應(yīng)力，而靠近中間層附近的鋼處和整個中間層區(qū)域均存在較大徑向拉應(yīng)力；鎢/鋼直接擴(kuò)散焊接頭的殘余應(yīng)力極大，鎢/釩/鎳/鋼擴(kuò)散焊接頭的殘余應(yīng)力有所降低，鎢/釩/銅/鋼擴(kuò)散焊接頭殘余應(yīng)力最小；接頭力學(xué)性能及斷裂特征驗證了有限元計算結(jié)果的準(zhǔn)確性。
關(guān)鍵字: 鎢；鋼；殘余應(yīng)力；擴(kuò)散焊；數(shù)值模擬
（State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China）
Abstract:A finite element method was employed to evaluate the residual stresses in W/FS (ferritic steel) joints,and the influences of V/Ni and V/Cu composite interlayer on residual stress distribution of W/FS joints were discussed. The results show that large residual stress is generated in W/FS diffusion bonded joints. The maximum compressive residual stress is presented in the tungsten near interlayer,while large tensile residual stress is shown in interlayer and steel near interlayer as well. The residual stress of W/FS direct diffusion bonded joint is the largest,the residual stress of W/V/Ni/FS joint is lower,and the residual stress of W/V/Cu/FS joint is the least. The tensile strength of the joints and fracture characteristics verify the accuracy of calculation results of the FEA.
Key words: tungsten; steel; residual stress; diffusion bonding; numerical simulation
