Ferritic-austenitic solidification mode in austenitic stainless steel welds
Ferritic-austenitic solidification mode in austenitic stainless steel welds
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DOI：
10.1007/bf02661201
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发表时间：
1980-05
期刊：
影响因子：
--
通讯作者：
N. Suutala;T. Takalo;T. Moisio
中科院分区：
文献类型：
--
作者：
N. Suutala;T. Takalo;T. Moisio
对AISI/ aws300系列50余种不同不锈钢焊缝的宏观和微观组织进行了分析。结果表明：在典型的屏蔽金属电弧（SMA）焊接条件下，焊缝的凝固比为1.48≾Creq/Nieq≾1.95，其中Nieqand Creqare为Schaeffler图上的镍和铬当量，以δ铁素体为主要（先导）相进行双相凝固。奥氏体在铁素体枝晶之间通过液体、铁素体和奥氏体的三相反应形成，随后以等轴或针状机制生长为铁素体，导致δ铁素体的体积分数急剧下降。室温下的显微组织具有普遍的不规则性和铁素体形态的变化。在室温下观察到的成分差异是凝固和固态转变的结果。
The macro-and microstructures of about fifty different stainless welds of the AISI/ AWS 300 series are analyzed. The results indicate that under conditions corresponding to a typical shielded metal arc (SMA) welding the welds with a ratio in the range 1.48≾Creq/Nieq≾1.95, where Nieqand Creqare the nickel and chromium equivalents on the Schaeffler diagram, solidify in accordance with a duplex mode with the delta ferrite as the primary (leading) phase. The austenite forms between ferrite dendrites through a three-phase reaction between liquid, ferrite and austenite, and subsequently grows into the ferrite by either an equiaxial or an acicular mechanism, resulting in a drastic decrease in the volume fraction of the delta ferrite. The micro-structure at room temperature is characterized by a general irregularity and the varied morphology of the ferrite. The compositional differences observed at room temperature are a consequence both of the solidification and the solid state transformation.