Effect of Heat Treatment on the Performances of Passivation Machine Drill Made of Yttrium-containing W18Cr4V Steel
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摘要: 针对W18Cr4V钢钻头因碳化物偏析严重、常存在大颗粒碳化物而导致其冲击性能和热疲劳性能较差等问题,采用不同的退火温度和淬火工艺对含钇W18Cr4V钢钝化机钻头进行了热处理,并通过SEM、冲击试验和热疲劳试验进行显微组织、冲击性能和热疲劳性能的分析。结果表明:随退火温度提高,W18Cr4V钢钻头的冲击性能和热疲劳性能均先提高后下降;分级淬火更有利于提高钻头的冲击性能和热疲劳性能,含钇W18Cr4V钢钝化机钻头的退火温度优选为900℃、淬火工艺优选为1 450℃×10 min+1 250℃×20 min分级淬火。Abstract: Focusing on the inferior impact and thermal fatigue performances of drill made of W18Cr4 V steel which are often caused by serious segregation of carbides and the existence of large carbides particles in the steel,different annealing temperatures and quenching processes were employed to carry out the heat treatment for passivation machine drill made of yttrium-containing W18Cr4 V steel,and the microstructure,impact properties and thermal fatigue performances of the drill were respectively analyzed by SEM,impact and thermal fatigue tests.The results show that with increasing annealing temperature,both the impact properties and thermal fatigue performances of the drill are firstly improved then degraded.Step quenching is more conducive to the improvement of impact properties and thermal fatigue performances of the drill.For the passivation machine drill made of yttrium-containing W18Cr4 V steel,the optimal annealing temperature is 900℃ with optimum step quenching of 1 450℃×10 min+1 250℃×20 min.
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