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用40CrNi钢研究了断口遗传现象。结果得出,断口遗传与原过热温度密切有关。经850℃再次加热淬火消除粗大过热组织后,如原过热温度不高,则虽也观察到了原奥氏体晶界,但不出现断口遗传。如原过热温度较高,则在再次正常淬火后还须经500℃脆化处理后才出现断口遗传。如原过热温度高于1500℃,则在再次淬火后不必经脆化处理就可出现断口遗传,而脆化处理则将加重断口遗传。未观察到Cадовский等提出的由晶内织构所引起的断口遗传。据此可以认为断口遗传与过热时在奥氏体晶界发生的某种偏聚及析出有关。
The fracture genetic phenomenon was studied with 40CrNi steel. The results showed that the fracture of the original genetic temperature and the temperature is closely related. After 850 ℃ reheating quenching to eliminate coarse overheating, such as the original overheating temperature is not high, although the original austenite grain boundaries have been observed, but does not appear broken genetic. If the original overheating temperature is high, then again after normal quenching 500 ℃ embrittlement treatment only after the fracture genetic. If the original overheating temperature is higher than 1500 ℃, then after quenching again without embrittlement can appear fracture genetic, and embrittlement will increase the fracture genetic. No evidence of fracture inheritance caused by intracrystalline texture was proposed by Cадовский et al. Based on this, it can be considered that the fracture inheritance is related to some segregation and precipitation at austenite grain boundaries during overheating.