珠光体的

The new research achievement in recent years was synthesized to expound the new mechanism of eutectoid reaction in steel,to make a new explanation for the mechanism of the interphase precipitation and to renew the concept of pearlite .

本文综合近年来的研究成果，阐述了钢中共析分解的新机制，对于"相间沉淀"机理做了新的解释，重申了珠光体的新概念。

The resulting structure is a mixture of primary or pro-eutectoid ferrite (ferrite that formed above the eutectoid reaction) and regions of pearlite.

作为结果的组织结构是初步的共析铁素体和部分珠光体的混合物。

The increase of austenite grain boundaries and crystal defects can increase the nucleation rate of ferrite transformation, but it has no direct effects on the pearlite transformation.

变形造成的奥氏体晶界面积和晶体缺陷的增加只是增加了铁素体相变的形核率，而对珠光体的形核却没有直接的影响。

When the finishing temperature is 950℃ and the cooling rate is 4℃/s, the interlamellar spacings of pearlite is a bout 97 nm and the percentage of sorbite is 95.7%. At this time, the structure is the best.

高碳钢SWRH77B在终轧温度为950℃、冷却速度约为4℃/s时，其珠光体的片层间距约为97nm，索氏体含量达到95.7%左右，表明此时的组织为最佳索氏体组织。

Strain fatigue life in pearlite is longer than that in tempered sorbite with same tensile strength, which can be attributed to the small plastic strains in pearlite.

轨钢的应变疲劳是塑性应变控制过程，抗拉强度相等时，珠光体的应变疲劳寿命高于回火索氏体的疲劳寿命，其原因在于珠光体具有较小的塑性应变幅。

As the deformation temperature decreases and strain value increases, the microstructure after cooled to room temperature inclined to be equiaxed ferrite and pearlite.

随着变形温度的降低和变形量的增大，变形后冷却过程倾向于得到等轴状的铁素体加珠光体的组织。

All in all, under the factors above, the depleted zone in pearlite steel would crack fragilely for formation of creep-flaw in low stress during operating at high temperature before designed expiration date.

异种钢的焊接接头在高温运行中，在高温和应力的作用下，珠光体的脱碳层会产生蠕变裂纹，发生低应力脆性断裂，从而导致接头的早期失效。

It was found in this investigation that boron exerted considerable influenceon the nucleation and growth of pearlite. In a hypoeutectoid steel, boron delayedthe starting time of pearlite formation at the maximum pearlite formation temp-erature. Boron did not effect the relation of nucleation rate with time butonly increased the incubation period for pearlite nucleation.

从实验结果证明，硼对珠光体的成核及成长是有影响的；在亚共析钢中硼促使珠光体的开始形成时间推迟，增长了珠光体成核的孕育期，但对成核率与时间的关系，在近于A_1温度(700℃)时，略为加速，而在珠光体转变速度最大的温度(650℃)时却没有影响。

The results show that with the finishing temperature at 950 ℃, as the cooling rate increases, interlamellar spacings of pearlite is reduced; as cooling rate reaches 5℃/s, martensite precipitates.

结果表明，随着冷却速度的加快，高碳钢SWRH77B在950℃变形时，其珠光体的片层间距变细；冷却速度达到5℃/s时，有马氏体组织析出。

According to the morphological characteristics of cementite lamellae, the deformed pearlite can be divided into three kinds: irregularly bent lamella (pearlite lamella originally inclined with large angles to the rolling plane and irregularly bent after deformation); coarse lamellae with shear-band (the rhomboidal blocks of weakly deformed lamella bounded by shear band) and fine l...

按 渗碳体形态特点，变形珠光体组织可分为以下3种类型：(1)不规则弯曲片层型，即变形后的渗碳体与轧制面呈大角度偏离且不规则弯曲的珠光体。(2)带有剪切带的粗大片层型，即被渗碳体剪切带分开且变形轻微的珠光体。(3)精细片层型，即与轧制方向平行排列、片间距细小且渗碳体严重变形的珠光体。精细片层区域的比例随着轧制压下率的提高而增大。此外，重度冷轧变形还引起渗碳体严重塑性变形和部分溶解。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。