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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。
In view of the W18Cr4V steel drill bit due to severe segregation of carbides, there are often large particles of carbide leading to its impact performance and thermal fatigue properties and other poor, using different annealing temperature and quenching process Yttrium W18Cr4V steel passivation drill bit heat treatment , And the microstructure, impact properties and thermal fatigue properties were analyzed by SEM, impact test and thermal fatigue test. The results show that with the increase of annealing temperature, the impact and thermal fatigue properties of W18Cr4V steel drill bit firstly increase and then decrease; the classification quenching is more conducive to improving the drill bit impact performance and thermal fatigue properties. The annealing temperature of Y18Vr4V steel passivation drill bit, Preferably 900 ° C, the quenching process is preferably 1450 ° C × 10 min + 1 250 ° C × 20 min, classified quenching.