珠光体

Because alloy cast iron is made of 15 ~ 25% cementite,5 - 10% pellet~shaped graphite, pearlitic matrix.

这是因为合金铸铁的材质是由？5-25％渗碳体、5—10％球状石墨、珠光体基体所组成。

It is generally considered that the simple mechanical mixture of ferrite and cementite is gained in the pearlite transformation and there is prevenient phase in this process.

一般认为，珠光体转变得到铁素体和渗碳体的机械混合物，而且存在领先相。

Based on a nonclassical theory of plasticity and the continuum damage mechanics,a damage constitutive equation is obtained for the ferrite phase with the damage evolution law for mixed hardening materials from an ellipsoidal void model under particular coordinates,where the void shape variation is considered.

基于非经典塑性理论和连续介质损伤力学，利用在一个特殊坐标系下基于椭球形孔洞模型得到的可考虑孔洞形状变化混合强化材料的损伤演化率得到了铁素体相的损伤本构方程，通过混合物理论利用铁素体和渗碳体相各自本构关系并考虑其几何特征得到了珠光体团的损伤本构模型。

In order to enhance wear-resisting performance of the internal combustion engine piston ring,matrix microstructure and radial elastic force of the piston ring,the matching between piston ring and cylinder were analyzed.

为提高内燃机活塞环的耐磨性能，分析了活塞环的基体组织、径向弹力及活塞环与气缸套的匹配状况对其耐磨性的影响。试验表明活塞环的基体组织以细粒状珠光体或回火索氏体、石墨呈细小均匀分布为佳；活塞环的径向弹力大小应适宜，一般为

Based on the model, the main speciality of pearlite transformation of PD3 steel could be obtained.

试验结果表明，PD3钢中的珠光体转变是以多点形核的方式进行的，传统的珠光体单点形核机制不符合PD3钢的实际。

The matrix of steel is mainly ferrite, but pearlite also appears under certain conditions.

钢基体主要为铁素体，在一定条件下也可出现珠光体组织。

The microstructures of super-steel SS400 were composed of ferrite, the pearlite and small amount of bainite.

Super-SS400的显微组织为铁素体、珠光体和少量的贝氏体。

The results show that the fractography is woody structure, there is a great deal ferric oxide in the hair seam, its matrix is composed by the ferrite, the pearlite and a little of sorbite and troostite, the grain size is 9～10 levels primarily, there are obvious zone structure and inclusions, which are silicate, sulfide and a little of oxide.

结果表明：弯裂带钢的断口呈木纹状，发纹处存在大量氧化铁，其基体主要由铁素体和珠光体组成，有少量索氏体及屈氏体，晶粒度以9～10级为主，有较为明显的带状组织，夹杂物为硅酸盐、硫化物及少量氧化物。

Minor Ce is found in pearlite and honeycomb ledeburite which transformed by the dendrite of primary austenite, while major Ce in ledeburite of lathy cementite type.

初生奥氏体枝晶转变形成的珠光体和蜂窝状莱氏体都含有较少的Ce，而板状渗碳体型莱氏体含Ce较多。

The inherent variation in microstructure of as –cast pearlitic irons such as gray pearlitic malleable and modular often makes preliminary heat treatment necessary in order to assure desired uniformity of subsequent induction hardening results .

在当–cast珠光体铁上微结构的固有变化例如灰色珠光体展性和模件经常使得初步热治疗是必要的为了保证期望均一随后感应加热淬火结果。

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。