先共析铁素体 (proeutectoid ferrite)本意是低于共析成分的奥氏体,从高温慢冷下来之际,在发生共析相变(共析转变)之前析出的铁素体。由奥氏体晶界首先析出(转变温度约为770℃~680℃)。一般情况下,呈细条状分布在奥氏体晶界,有时也呈块状。非共析钢在珠光体转变之前析出先共析相的转变称为先共析转变。
熔敷金属组织主要是针状铁素体,少量的先共析铁素体。
Microstructure of the deposited metals is composed of acicular ferrite and a little proeutectoid ferrite.
熔敷金属组织主要是针状铁素体,少量的先共析铁素体。
The microstructure is composed of acicular ferrite and a little proeutectoid ferrite.
结果表明,随冷却速率的增大,先共析铁素体的晶粒尺寸减小,体积分数增大,针状铁素体增多;
The results show that with the increase of cooling rate, the grain size of proeutectoid ferrite decreases, the volume fraction of proeutectoid ferrite and acicular ferrite increases.
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