高于此点，由于超过共析点钢完全由珠光体和退火状态的渗碳体组成，硬度增加并不多。
Above this point the hardness can be increased only slightly, because steels above the eutectoid point are made up entirely of pearlite and cementite in the annealed state.
如图2.1所示的简化铁碳状态图将焦点集中在共析区，这对理解钢的性能和处理是十分有用的。
A simplified diagram, such as the one in Fig. 2.1, focuses on the eutectoid region and is quite useful in understanding the properties and processing of steel.
应用电子衍衬技术和扫描电镜等手段，对共析珠光体轨钢的微观结构和断裂过程，进行了观察和分析。
The microstructure and fracture process of an eutectoid pearlitic steel have been observation and analysed by means of electron-diffraction-contrast technique and SEM.
钢中珠光体转变属典型的扩散型共析转变。
Pearlitic transformation in steel is a typical diffusion eutectoid transition.
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.
含碳量少于共析体(低于0.77%)的钢称为亚共析钢。
Steels having less than the eutectoid amount of carbon (less than 0.77%) are known as hypo-eutectoid steels.
研究贝氏体相变的特点，弄清贝氏体相变反应与共析分解的区别极为重要。
It is important to understand the difference of bainite transformation and eutectoid decomposition in steels.
共析分解是个自组织过程，具有铁素体和渗碳体互为领先相的整合机制。
The eutectoid decomposition is a self organization process, which is characterized by the integrated mechanism that ferrite and cementite acted as prevenient phase alternatively.
其成分特征是碳含量在共析点左右的高碳低锰钢轨钢。
The main characteristics of the rail steel are low manganese and high carbon which content is being closed to eutectoid.
作为结果的组织结构是初步的共析铁素体(在共析反应前的铁素体)和部分珠光体的混合物。
The resulting structure is a mixture of primary or pro-eutectoid ferrite (ferrite that formed above the eutectoid reaction) and regions of pearlite.
此处理方法对必须机加工的过共析钢特别有用。
This treatment is particularly useful for hypereutectoid steels that must be machined.
由于超过共析点钢完全由珠光体和退火状态的渗碳体组成，因此高于此点硬度增加并不多。
Above this point the hardness can be increased only slightly, because steels above the eutectoid point are made up entirely of pearlite and cementite in the annealed state.
硼有加速珠光体成长率的作用，无论在亚共析或共析钢中皆有同样的现象产生。
It was found by experiments thatboron increased the growth rate of pearlite, both in hypoeutectoid and eutectoid steels.
由于恰好高于低临界温度通常使过共析钢奥氏体化而硬化，所以对外层采用较低的热处理温度。
The lower heat-treating temperature of the case results from the fact that hypereutectoid steels are normally austenitized for hardening just above the lower critical point.
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;
最后讲述了珠光体生长的台阶机制及一些非铁碳合金的共析组织。
At the last, the steps mechanism of pearlitic growing and some eutectoid structures of non Fe-C alloys are pointed out.
含碳量少于共析体(低于0.77%)的钢称为亚共析钢。
Steels shaving less than the eutectoid amount of carbon (less than 0.77%) are known as hypo-eutectoid steels.
锌铝共析合金具有良好的超塑性，但通常需要经过预变形(轧制或锻压)来得到。
Usually, excellent Superplasticity of Zn-Al eutectoid alloy could be obtained by pre-deformation (rolling or forging).
为了准确地检验高碳过共析钢盘条中的网状渗碳体，分别对选用硝酸酒精溶液侵蚀和碱性苦味酸钠水溶液热侵蚀两种显示方法进行了比较。
In order to detect the carbide network in high carbon hypereutectoid steel wire rods accurately, two kinds of detection method of the carbide network are compared.
研究了两种基体的亚共析钢经激光处理后，其硬化层的硬度梯度及其磨损特性。
The hardening gradient and the character of abrasion in hardening layer of hypoeutectoid steel with two kinds of matrixes that was treated by laser beam have been studied.
钢含磷量提高到0．9％以上，控制钢丝的热处理制度，使过共析钢丝强韧性显著提高。
The strength and tenacity of super-eutectoid steel wire have been improved notably by increasing the carbon content of the steel to more than 0.9% and controlling the heat-treatment system.
扫描电镜观察表明，加入铝，可抑制锻后空冷条件下先共析网状碳化物的析出；
The microstructure analysis by SEM showed that the precipitation of netlike proeutectoid carbide has been inhibited during air cooling after forging due to Al addition to the UHCs.
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...
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.
过共析钢是含碳量大于共析量的钢。
Hypereutectoid steels are steels that contain greater than the eutectoid amount of carbon.
当这种钢冷却时，就像图2.1的z - z线所示，除了初步的或预共析状态用渗碳体取代铁素体外，其余类似亚共析钢的情况。
When such steel cools, as shown in zz 'of Fig. 2.1 the process is similar to the hypo-eutectoid case, except that the primary or pro-eutectoid phase is now cementite instead of ferrite.
总结了合金电镀中出现反常现象的五种主要原因，并详细介绍了异常共析和诱导共析这两种合金电析中的特异现象。
Five essential causes resulting the abnormal phenomena in alloy plating such as anomalous codeposition and induced codeposition are explained in detail.
总结了合金电镀中出现反常现象的五种主要原因，并详细介绍了异常共析和诱导共析这两种合金电析中的特异现象。
Five essential causes resulting the abnormal phenomena in alloy plating such as anomalous codeposition and induced codeposition are explained in detail.
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