本文選題：馬氏體時(shí)效鋼 + 鐵路轍叉��； 參考：《焊接學(xué)報(bào)》2015年10期

【摘要】：通過數(shù)值計(jì)算和組織觀察,分析了熱輸入對馬氏體時(shí)效鋼(C300)鎢極氬弧焊焊接接頭溫度場及焊縫胞晶組織的影響.結(jié)果表明,試驗(yàn)條件下,隨著熱輸入的增大,熔深和熔寬均增大,深色腐蝕區(qū)(HAZ2,heat affected zone2)逐漸變寬并遠(yuǎn)離焊縫中心,上窄下寬的差異也將隨之增大,760℃等溫線距熱源中心的距離基本符合r=0.465E+0.987(mm)關(guān)系式;胞晶尺寸隨著熱輸入的增大而增大,基本符合λ2=3.324×E2/3(μm)關(guān)系式,小熱輸入情況下適用性高.最佳熱輸入不僅可以得到成形良好的焊縫,而且計(jì)算值與實(shí)測值吻合程度較高.
[Abstract]:Through numerical calculation and microstructure observation, the effect of heat input on the temperature field and cellular structure of maraging steel C300) welded joint by TIG welding was analyzed.The results show that, with the increase of heat input, both the penetration depth and the melting width increase, and the dark corrosion zone of HAZ2heat affected zone2) becomes wider and farther away from the center of the weld.The difference of upper, narrower and lower width will also increase the distance between the isotherm of 760 鈩，

本文編號：1737092