本文用扫描电镜观察了正火或退火后再加热至700℃保温短时、水冷的加稀土与未加稀土的10MnP,15MnP及Fe-P合金断口,测量了锰磷试验钢断口和磨面的电极电位,并做了断口Auger电子能谱和离子探针成分深度分析。结果表明,所有试验材料在室温至-100℃打断时,不发生晶界断裂,除了在室温至-25℃断口上出现少量韧性断裂外,都是脆性解理断口。解理断口富磷。
A fractographic study on 10MnP and 15MnP steels with or without RE additions,as well as on Iron-phosphorus alloys under normalized or annealed and then reheated at 700℃ W. C. conditions has been carried out by SEM. The electrode potentials on fracture or polished surface of the RE free steels have been determined, and further investigations on their fractures have also been made by AES and ion-probe analysis.It was found that no intergranular fracture occurs in all the specimens ruptured at room temperature till—100℃. Most of the fractures are brittle cleavage in nature, except that a little ductile fracture appeared on fractures of the specimens ruptured at the interval from room temperature to—25℃. It seems that the cleavage fractures are enriched with phosphorus.
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