2209和2507双相不锈钢堆焊层组织结构及耐蚀性对比
发布时间：2018-11-22 11:52
【摘要】：利用光学显微镜、X射线衍射仪、扫描电子显微镜和能谱仪等,对2209和2507双相不锈钢FCAW堆焊层焊态、退火态的组织结构和耐蚀性进行对比研究。结果表明:两种堆焊层焊态时均主要由铁素体α和魏氏体状奥氏体γ组成,在α晶内及α/γ界面处存在少量细条状的二次奥氏体γ_2,在α/γ、α/α界面处还存在极少量的点状σ相;两种堆焊层经690℃×8 h退火后,σ相和γ_2均明显增多。两种堆焊层焊态的耐蚀性均合格,且2507型堆焊层的耐蚀性优于2209型堆焊层;而两种堆焊层退火态的耐蚀性均急剧下降、严重不合格,这主要是由于退火过程中堆焊层内析出大量σ相和γ_2所致。
[Abstract]:The microstructure and corrosion resistance of FCAW surfacing layer of 2209 and 2507 duplex stainless steel were studied by means of optical microscope, X-ray diffraction, scanning electron microscope and energy spectrometer. The results show that the two kinds of surfacing layers are mainly composed of ferrite 伪 and ferrite austenite 纬, and there are a small amount of fine secondary austenite 纬 _ 2 in 伪 -crystal and 伪 / 纬 interface, and 伪 / 纬, respectively. At the 伪 / 伪 interface, a very small number of point 蟽 phases also exist. After annealing at 690 鈩，
本文编号：2349298
[Abstract]:The microstructure and corrosion resistance of FCAW surfacing layer of 2209 and 2507 duplex stainless steel were studied by means of optical microscope, X-ray diffraction, scanning electron microscope and energy spectrometer. The results show that the two kinds of surfacing layers are mainly composed of ferrite 伪 and ferrite austenite 纬, and there are a small amount of fine secondary austenite 纬 _ 2 in 伪 -crystal and 伪 / 纬 interface, and 伪 / 纬, respectively. At the 伪 / 伪 interface, a very small number of point 蟽 phases also exist. After annealing at 690 鈩，
本文编号：2349298
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