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先共析铁素体
[机][冶] 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。
Microstructure of the deposited metals 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. - 低碳低合金钢焊缝金属的显微组织基本上包括先共析铁素体、针状铁素体、侧板条铁素体、少量的粒状贝氏体和马氏体。
In general, the microstructure of weld metal of the low carbon and low alloy steels consists of pre eutectoid ferrite, acicular ferrite, side plate ferrite and some granular bainite and martensite.
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