The fracture and spheroidization of cementite shows obvious anisotropy . there are two possible mechanism about spheroidization of cementite : the fracture cementite lamellae grows up non - uniformly and the fine spherical cementite particles grows up as the core 渗碳体的破碎和球化表现出明显的各向异性。渗碳体的球化可能以两种机制进行：破碎渗碳体片的非均匀长大和细小球状渗碳体颗粒的形核长大。
In order to avoid eutectic carbide , improve nodularity , increase nodule count and increase mechanical properties , three times of inoculations were adopted in the centrifugally cast nodular iron pipes production : a ) inoculation in ladle ; 2 ) pouring stream inoculation ; 3 ) in - mold inoculation 摘要在离心铸造球墨铸铁管生产中，为防止共晶渗碳体析出，改善球化，增加石墨球数，提高力学性能，采用了三次孕育： ( 1 )包内孕育； ( 2 )浇注时随流孕育； ( 3 )型内孕育。
On the surface of annealed 45 steel , as the pearlite in it contains cementite phase and has high crystal boundary density , the nucleation and growth of deposits prefer to occur at the pearlite at the beginning during depositioa the coating exists in form of nano - polycrystal layers composed by gathering of nano - sized crystals 在退火态45钢表面，由于珠光体组织中含有渗碳体相且具有比较高的晶界密度，因而在沉积初期镀层优先在此处形核和生长；镀层在基体表面是以纳米尺度的晶粒聚集在一起形成的聚晶体形式存在的。
( 4 ) which deformation behavior of cementite lamellae in pearlite colonies is closely related to the stress state of cementite which significantly depends on cementite thickness and orientation , especially on cementite thickness . ( 5 ) the lamellar cementite undergoes partial dissolution on the present deformation . the thermodynamical destability of cementite is attributed to a large number of defect in cementite introduced by severe plastic deformation providing evidence for cementite dissolution 而渗碳体的应力状态主要是与渗碳体的片层厚度和取向密切相关的，其中渗碳体的厚度起决定性作用； ( 5 )本实验变形条件下，渗碳体出现了部分溶解的现象，这是由于强烈塑性变形而在渗碳体中引入大量的缺陷导致其处于高能不稳定状态从而促使了渗碳体溶解。
Equal channel angular processing of the pearlitic steel ( 0 . 65 wt . % c ) was successfully carried out at 650 with route c in this study , obtaining a total equivalent true strain ~ 5 . the microstructure evolution of pearlitic steel in ecap was investigated by means of transmission electron microscope and scanning electron microscope . the main results are as the following : 1 本研究成功地实现了c方式650珠光体钢65mnecap变形，累积等效真应变达到5 。并用透射电镜、扫描电镜研究了珠光体组织的演变特点和渗碳体的变形。主要结果如下： 1
