热处理对06Cr18Ni11Ti组织及抗热疲劳性能的影响

Effects of heat treatment on microstructure and thermal fatigue resistance of 06Cr18Ni11Ti

研究了不同热处理温度（1 000℃,1 025℃,1 050℃,1 075℃）和时间（60 s,120 s）对06Cr18Ni11Ti组织和抗热疲劳性能的影响.分析表明,热处理温度和时间能够影响晶粒大小和碳化物形态.随着保温时间的增加,晶粒和碳化物的尺寸增加;温度升高,碳化物的数量和尺寸增加.相同的保温时间下,晶粒长大受保温温度和碳化物的影响.在20~600℃的循环条件下,1 050℃×60 s处理后试样的热疲劳裂纹最短,变形较小,抗热疲劳性能最好.

The effects of holding temperature( 1 000 ℃,1 025 ℃,1 050 ℃,1 075 ℃) and time( 60 s,120 s) on thermal fatigue resistance of hot die steel 06Cr18Ni11Ti were researched. The results show that the holding temperature and time could affect grain size and carbide. The size of both grain and carbide rise with the increase of heat treatment time. The amount and size of carbide increase with the increase of heat treatment temperature. The grain size depends on both holding temperature and carbide under same heat preservation time. The thermal fatigue resistance with 1 050℃ × 60 s is the best,distortion is low and the crack length is the minimum under thermal cycles condition of 20 ~ 600 ℃.