奥氏体晶粒

微钛钢中TiN析出对奥氏体晶粒长大的影响

The influence of tin precipitation on austenite grain size in titanium microalloyed steel

在轨钢中加入Nb，可明显细化热轧、热处理轨钢的奥氏体晶粒，从而提高其韧性。

Niobium additions can diminish the size of austenite grain of hot-roll and heat treatment rail steels , improve toughness .

BP网络模型在含硼微合金钢奥氏体晶粒尺寸及道次间软化程度预测中的应用

Study on the Model of Austenite Grain Size and Softening Fraction in Microalloyed Steel with Neural Networks

随W（Ti）e增加，试验用钢的奥氏体晶粒尺寸减小，晶粒粗化温度提高。

With the increase of ω( Ti ) e content , the austenite gain size decreases and the grain coarsening temperature of the steel rises .

研究表明，钢中的B与AlN争夺N，降低了起细化晶粒作用的AlN的含量，造成奥氏体晶粒粗化；

The studies show that B in steel competes N with AlN and reduces the amount of AlN that can refine the grains to coarsen austenite grains ;

但是，当加热温度达到1240℃时，含Nb钢的奥氏体晶粒却大于不含Nb钢的奥氏体晶粒尺寸。

But when the heating temperature was 1240 ℃, the austenite grains of Nb steel were larger than those of Nb free steel .

钢中的N由于生成了细小弥散分布的第二相粒子（Ti，Nb）N而细化了高温奥氏体晶粒，改善了焊后韧性。

Toughness after welding is improved because of formation of fine and dispersive second phase particles ( Ti , Nb ) N which refines austenite grain size at high temperature .

结果表明，εc随变形温度降低而减小，随形变速率和原始奥氏体晶粒大小增大而增加。其中，变形温度对εc的影响最大。

The experimental results indicate that ε _c decreases with decreasing the deformation temperature and increases with increasing the strain rate and prior austenite grain size , and the deformation temperature is of the most significant effect .

以实验数据为基础，建立了含硼微合金钢高温奥氏体晶粒尺寸及道次间软化程度与热加工工艺参数间的BP网络（人工神经网络）模型。

This paper has developed two BP network models relating austenite grain size and softening fraction with hot working parameters in microalloyed steel on the basis of experimental data in gleeble-1500 system .

计算结果表明，高温阶段的析出相为TiN，微细的TiN强烈地抑制奥氏体晶粒长大；

The calculating results show that nitride TiN is considered as the dominant precipitate in high temperature region and the main contributor to the retardation of austenite grain growth ;

利用Austin-Rickett指数法，研究连续冷却条件下奥氏体晶粒尺寸、冷却速度、C含量对先共析转变过程的影响，解释连续冷却条件下铁素体快速、大量析出的原因。

By using the ARE method , the effects of the austenite grain size , cooling rate and carbon content on the pro-eutectoid transition were researched respectively . The phenomenon of the ferrite liberating quickly and massively was interpreted .

根据实验结果，分别求出了n值和奥氏体晶粒生长激活能Q，并对晶粒生长机制进行了讨论。

The values of n and the activation energy , Q , for the austenite grain growth were worked out according to the experimental results , and the mechanism of grain growth was discussed .

在Gleeble1500热模拟试验机上进行了不同加热温度对Nb的质量分数为0.015%的钢和不含Nb钢奥氏体晶粒尺寸的影响试验。

The effects of heating temperature on austenite grain size of 0.015 % Nb steel and Nb free steel were investigated by Gleeble 1500 thermomechanical simulator .

Nb-V复合非调质钢奥氏体晶粒长大行为

Austenite grain growth behavior of Nb-V alloying non-quenched and tempered steel

模拟热循环的峰温高于Ac3时，随着峰温的提高，奥氏体晶粒明显长大，马氏体板条尺寸也相应增大，因此冲击韧性相应下降。

As the peak temperature of thermal simulation , which was higher than Ac3 , increased , the prior austenite grain size and the martensite lath size increased , and consequently the impact toughness depressed .

随钢中含碳量的增加，原奥氏体晶粒内片状马氏体的分形维数Df增加。

The fractal dimension Df of plate martensites formed in an original austenite grain gets a raise with the increase of carbon in carbon steels .

之间存在指数函数关系；动态再结晶完成后，奥氏体晶粒平均直径与变形速率温度修正系数Z之间符合线性关系。

Af ter the dynamic recrystallization was finished , the relationship between the average diameter of austenitic grains and the modification factor Z of temperature for de formation velocity was linearly conformable .

P50钢轨钢的奥氏体晶粒度对其门槛值和裂纹扩展速率的影响

Influence of Austenitic Grain Size of P50 Railway Steel on Threshold Value and Crack Growth Rate

比较了Nb－V、Nb－Ti两种微合金钢在高温下抗奥氏体晶粒长大的能力，以及经受高温焊接热循环后，两种钢的冲击韧性。

In this paper the ability of Nb-V and Nb-Ti microalloyed steels to resist austenite grain growth and the impact toughness of the two steels after high temperature welding thermal cycle are compared .

对含Nb量相同、含Ti量不同的一组试样进行了焊接热模拟试验及高温奥氏体晶粒度测试；

The simulated welding thermal cycle was applied to a set of steels with the same Nb content and the different Ti content . The austenite grain size at high temperature was also measured .

Nb-V-Ti微合金钢再加热过程中的奥氏体晶粒粗化

Austenite Grain Coarsening during Reheating in a Nb-V-Ti Microalloyed Steel

并提出断裂韧性与缺口韧性、拉伸塑性的关系取决于尖裂纹前沿有效变形区尺寸（2c）与原奥氏体晶粒尺寸（dγ）的相对大小。

The relationship between fracture toughness and notch toughness 、 tensile ductility depends on the relative size of effective influence region ( 2c ) and austenite grain .

原奥氏体晶粒度对45V非调质钢力学性能的影响

Effect of Austenite Grain Size before γ / α Transformation on Mechanical Properties of 45V Steel

研究了不同焊接热循环参数T（max）及△t（max/8）对微合金化钢热影响区奥氏体晶粒尺寸影响。

This paper studies effect of two main parameters of welding thermal cycle . T_ ( max ) and △ t_ ( max / 8 ) on Austenite grain size of HAZ in the field of microalloy steels .

分析了传统的焊接热影响区（HAZ）晶粒长大模型，在此基础上，介绍了适用于高强度管线钢的奥氏体晶粒长大的耦合模型。

In this paper , the traditional HAZ grain growth model is analyzed . Based on the model , analytical model of austenite grain growth fit to high strength pipe-steel is introduced .

在本研究中，xW约为原始奥氏体晶粒大小的11倍。

In this work , xW is about 11 times of the original austenite grains .

高温高压法加速腐蚀。结果表明，C4镍基合金热影响区奥氏体晶粒长大，X60钢过热区为大块铁素体组织。

The results show that the coarse austenite grain in heat affect zone ( HAZ ) of Ni-base alloy is observed , mass ferrite appears in HAZ of X60 steel .

结果表明，M7C3碳化物是在高温保温阶段奥氏体晶粒边界液相区域形成了富铬富碳的微区。

The results show that M_7C_3 carbides form in the liquid phase zones of the austenite grain boundaries during the high temperature soaking stage .

为提高CGHAZ的性能，国内外广泛研究奥氏体晶粒、二次组织和针状铁素体对CGHAZ性能的影响。

In order to increase properties of CGHAZ , the effect of austenite grain , secondary structure and acicular ferrite on properties of CGHAZ has been investigated widely at home and abroad .

采用微合金化和循环热处理可以在合金结构钢中获得2μm的奥氏体晶粒，1500MPa级抗拉强度下改善了耐延迟断裂性能。

Austenite grain size of 2 microns is presented in structural alloy steel with microalloying element addition and cycle heat treatment , which result in an improvement in anti-delayed fracture property at ultimate tensile strength level of 1 500 MPa .