先共析铁素体

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 .

焊缝金属的显微组织主要由先共析铁素体、针状铁素体和珠光体组成。

The microscopic structure of the weld mainly consisted of proeutectoid ferrite , acicular ferrite and pearlite .

研究中发现，在连铸过程中，硼添加到钢中，显著推迟了先共析铁素体的析出，抑制了P，S等元素在晶界的偏聚。

It is found that the pre eutectoid ferrite is retarded by addition of B element and the segregation of P and S on the grain boundary is restrained .

在碳锰纯净钢的冷却转变过程中，随La含量的增加，先共析铁素体开始析出温度降低，析出速度加快，共析转变开始温度降低。

During the cooling transformation process of carbon-manganese purity steels , the precipitation starting temperature of pro-eutectoid ferrite and eutectoid decreases and the precipitation speed increases with increasing La content .

在γ+α两相区，Nb对钢的塑性影响较小，钢的脆性是沿γ晶界薄膜状先共析铁素体α相的析出造成的。

In the γ + α two phase region , precipitation of proeutectoid ferrite film along austenite grain boundaries is the main reason for the embrittlement of the steel .

向焊缝熔敷金属过渡微量的Ti-B和稀土元素，可以有效地抑制先共析铁素体的析出，使焊缝获得细小、均匀的针状铁素体组织。从而提高了焊缝的低温冲击韧性。

It was effective to resist precipitation of grain boundary ferrite and make fine homogeneous acicular ferrite formation by transferring suitable amount of Ti-B elements and suitable amount of rare earth elements so that it increased low temperature toughness of weld deposited metal .

药芯焊丝焊缝中先共析铁素体的数量预测

Amount prediction of proeutectoid ferrite in flux cored wire welded seam

在800℃加载时可以避免先共析铁素体的产生。

No pro-eutectoid ferrite appears when steel is loaded in 800 ℃ .

亚共析钢中先共析铁素体形态的研究

An investigation on the morphology of the proeutectoid ferrite in hypoeutectoid steel

奥氏体形变对先共析铁素体等温形成孕育期的影响

Effect of Austenite Deformation on isothermal nucleation incubation time of Pro-eutectoid Ferrite

随着形变温度的提高和先共析铁素体的减少，织构减弱。

The increase of deformation temperature reduced the texture intensity .

热变形奥氏体先共析铁素体的热力学计算

Thermodynamic Calculations on the Proeutectoid Ferrite Transformation of Deformed Austenite

热变形温度对先共析铁素体等温转变动力学的影响

The effect of kinetics on hot deformation of austenite to isothermal transformation of proeutectoid ferrite

不发生先共析铁素体转变的临界冷却速度为0012℃/s。

The critical cooling rate that does not occur pre - eutectoid ferrite is 0.012 ℃ / s.

本研究建立了一个基于模式识别方法的先共析铁素体计算机定量分析系统。

This paper has successfully established a content analysis system of Pro-eutectoid Ferrite Steel based on pattern recognition .

先共析铁素体沿原始奥氏体晶粒边界生长，形成网状结构。

The pre eutectoid ferrite transformation initiated at the original austenite grain boundaries and formed a net structure .

焊缝柱状晶区的组织由沿柱状晶界分布的先共析铁素体+侧板条铁素体+块状铁素体+针状铁素体组成；

The microstructure of weld seam columnar grain are composed of proeutectoid ferrite 、 FSA 、 massive ferrite and acicular ferrite .

结果表明，对于亚共析钢，在中温区变形、保温后可使先共析铁素体和珠光体组织大大细化，显著改善钢中铁素体和珠光体的分布状况；

The results show that , in hypoeutectoid steels , deformation at medium temperature may fine the structure and improve the distribution of ferrite and pearlite greatly ;

结果表明，该钢在冷却过程中组织均为未溶的先共析铁素体、从奥氏体中析出的共析铁素体、少量的无碳化物贝氏体、粒状贝氏体和马氏体。

The results show that the microstructure of the steel obtained after cooling is proeutectoid ferrite , eutectoid ferrite from the austenite , a little carbide-free bainite , granular bainite and martensite .

同时能够减少焊缝金属中先共析铁素体的含量，促进针状铁素体的形成，提高焊接接头的低温冲击韧性值。

At the meantime , this alloy method can effectively reduce the content of proeutectoid ferrite in weld metal , and promoting the forming of the acicular ferrite , with great impact ductility of weld joint .

高碳钢中加入的铬元素抑制先共析铁素体析出，减小珠光体片层间距，可明显提高抗拉强度，提高断面收缩率，改善线材的拉拔性能。

By Cr microalloying , the fore eutectoid ferrite eduction is restrained , the distance between rows of pearlite is decreased , then the tensile strength , section shrinkage and drawing property of high carbon steel wire rod is obviously raised and improved .

结果表明，对薄试样拉伸变形时，不论是否有氢，先共析铁素体优先发生塑性变形，微裂纹沿先共析铁素体与珠光体团的边界形核、扩展；

The result shows that , for the thinner specimen , plastic deformation occurs firstly in proeutectoid ferrite and then grows along the prior austenite grain boundary , and then , a microcrack initiates and propagates preferentially at the interface of proeutectoid ferrite and pearlite colony .

随着冷却速度的提高，先共析铁素体的含量逐渐减少，当冷却速度达到100K/min时，先共析铁素体的析出已完全被抑制，也就是说，铁素体的临界冷却速度低于100K/min。

The content of pro-eutectoid ferrite decreases with increase of cooling velocity . The precipitation of pro-eutectoid ferrite is restrained completely , when the cooling velocity gets to 100 K / min. In other words , the critical cooling velocity of ferrite is lower than 100 K / min.

试验结果表明，本试验用钢不发生先共析铁素体析出的临界冷却速度为0.15℃／s；冷却速度在0.15～1.00℃／s范围时可得到全部粒状贝氏体组织；

The experimental results show that the critical cooling rate of pro - eutectoid ferrite is 0 . 1 5 ℃ / s , and the structure of complete granular bainite can be obtained with a cooling rate from 0 . 15 ℃ / s to 1 ℃ / s.