spheroidal pearlite

At last, the density of dislocation of the material increases greatly after hot forging, then segregation of carbon occurs, which also result in non-uniformly austenite and then spheroidal pearlite.

热加工时，位错密度大大增加，使碳出现偏聚，增加了奥氏体不均匀的程度，促进粒状珠光体的形成。

In use of spheroidizing agency treatment, some spheroidal graphites and carbide on the matrix of lamellar or sorbitic pearlite can be achieved in as-cast state.

其基本特点是通过对钢水的球化处理使材料在铸态下得到一定量的球状石墨和碳化物，基体组织为片状珠光体或索氏体。

Heat treatment: Through annealing, spheroidal pearlite can be achieved, and toughness rises, and on the other hand strength decreases.

热处理：通过退火，基体组织为粒状珠光体，强度、硬度下降，韧性大幅度上升；

During the study, spheroidal pearlite of spheroidal-graphit cast steel has been achieved after hot-forging or normalizing first.

另外本文在研究过程中，发现在锻造和正火条件下得到了粒状珠光体，这在球墨铸钢领域里是未见报道的。

Studies on carbides granulation in austenite ( forged or reheated) of 45 steel through the technology of controlling cooling is carried out, and the refining or spheroidal structure of the spheroidal pearlite ( Ps) is obtained.

本文作者研究了45钢的奥氏体（锻后的或重新加热的）通过控制冷却技术，使其碳化物粒化，得到Ps型的调质或球化组织。

Size of spheroidal graphite-2nd grade; Pearlite amount 90-95%;

石墨球大小2级，珠光体量90～95%；

In range of 860-950 ℃ normalizing, ideal spheroidal pearlite can be achieved after normalizing.

锻造、正火后，基体组织为粒状珠光体。在860～950℃之间正火，可以得到理想的粒状珠光体组织。

By means of appropriate spheroidizing treatment on the liquid of steel, casting structure direct acquire certain quantitative spheroidal graphite 、 carbide and pearlite, reduces the content of harmful impurity effectively.

通过对钢液进行适当的球化处理，铸态组织直接获得一定数量的球状石墨、碳化物和珠光体，并有效地降低有害杂质的含量。

The second, the existing of graphites make the austenite become non-uniformly highly, which is advantageous to the formation of spheroidal pearlite;

由于石墨的存在，高温下奥氏体不均匀程度很高，有利于粒状四川大学硕士学位论文珠光体的形成。