Effect by Tempering Temperature on Strength and Toughness Matching of V150 Steel for Drill Pipe Service
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摘要: 对V150钻杆钢进行了系统的回火温度优化试验,大幅度提高了钻杆钢的冲击韧性。并通过第二相析出物的形态及数量统计,对钻杆钢的强韧性匹配规律进行了微观机理解释。结果表明,在回火温度的拐点温度以下,钻杆钢在保持V150钢级基础上,冲击韧性随回火温度升高提高了近50%。随着回火温度的升高,第二相粒子的体积分数先升后降,为钻杆钢保持高强度级别提供了优化空间,而第二相粒子由棒状趋于球化和材料基体的逐渐软化,是韧性提高的主要原因。Abstract: Systematic tempering temperature optimization experiments are conducted to the V150 steel for drill pipe service. As a result, the impact toughness of the steel is enhanced significantly. Based on the statistics of morphology and fraction of the second phase particles, the strength and toughness matching law of the steel is explained from the point of view of micromechanisms. It is finally identified that the impact toughness of drill pipe-purpose steel can be increased by about 50% within the range of the turning-point tempering temperature, while the steel is still in possession of the nature of the 150 grade steel; and that as the tempering temperature increases, the volume fraction of second phase particles first increases, and then decreases, which provides an enough room for optimization of the steel so as to get it remaining as a hi-strength grade steel. It is also revealed that the spheroidization of the second phase particles from their original bar shape together with gradual softening of the substrate greatly contribute to improvement of the steel's impact toughness.
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Keywords:
- Drill pipe-purpose steel /
- V150 steel grade /
- Tempering temperature /
- Strength /
- Toughness
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