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物探气动冲击钻头本体失效的主要形式有:冲击端面的疲劳破坏;花键的塑性变形、压溃剥落;钻头本体的磨损。钻头本体失效,一方面导致能量传递效率下降,另一方面导致钻头牙齿的脱落,危害很大。选择低碳超高强度钢22S iMnN i2CrMoA作为新型钻头本体材料,经试验研究,确定其最佳的热处理工艺为:锻造毛坯、均匀化处理及退火、890℃淬火、300℃回火。最佳淬硬层深度范围为:1.8~2.0 mm。经过热处理后,其强度、硬度和冲击韧性都接近或高于国外钻头,且明显高于国内钻头。
Geophysical impact drill main body failure of the main forms are: the impact of the end face of fatigue damage; spline plastic deformation, crushing flaking; drill body wear. Drill body failure, on the one hand lead to the decline of energy transfer efficiency, on the other hand lead to bit teeth off, a great harm. Select the low-carbon ultra-high strength steel 22S iMnNi2CrMoA as a new type of bit body material, the experimental study to determine the best heat treatment process: forging rough, uniform treatment and annealing, 890 ℃ quenching, 300 ℃ tempering. The best hardened layer depth range: 1.8 ~ 2.0 mm. After heat treatment, its strength, hardness and impact toughness are close to or higher than foreign drill, and significantly higher than the domestic drill.