压力容器用碳素钢和低合金钢,在常温下的组织一般为铁素体加珠光体。珠光体晶粒中的铁素体及渗碳体是呈薄片状相互间夹的。片状珠光体是一种不稳定的组织,当温度较高时,原子活动力增强,扩散速度增加,片状渗碳体便逐渐转变为珠状,再积聚成大球团,从而使材料的屈服点、抗拉强度、冲击韧性、蠕变极限和持久极限下降,这种现象称作珠光体球化。
珠光体球化反映到金相上,是一种不规则图像的变化,并且具有分形的特征,可望用分形几何的方法来进行描述。
Pearlite spheroidization is irregular changing of metallographical image and has the features of fractal, so it can be described by technique of fractal.
结果表明:珠光体温变形显著加快了碳化物球化过程。
Results showed that warm deformation of pearlite will accelerate greatly the spheroidizing process.
结果表明,高珠光体含量球铁凸轮轴的洛氏硬度随着球化率和珠光体含量的升高而增加。
The result showed that the Rockwell hardness of the high pearlite-containing nodular iron camshaft increased with increasing of its nodularity and pearlite content.
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