油田射孔弹弹体粉末冶金成形工艺优化与性能强化

Process optimization and performance enhancement of powder metallurgy forming of oil field perforating bullet body

摘要:

采用粉末冶金复压复烧工艺制备油田射孔弹弹体,并对压制压力、保压时间、成形方式等对压坯组织结构及密度分布的影响规律进行了深入研究．研究结果表明:初压压力为600 MPa,复压压力为800 MPa时压坯组织及密度较为适宜,当压坯密度超过7.4 g/cm³后,继续提高压力,压坯密度也不会随之增加．采用补偿挤压强化致密的工艺方法可获得具有一定密度梯度分布的高密度粉末冶金弹体,弹体平均密度达到7.3 g/cm³,抗拉强度和延伸率分别达到647 Mpa和3.78％．不同弹体的爆靶试验对比结果表明,粉末冶金弹体在钢靶及混凝土靶的爆靶穿深值和孔径都超过爆靶标准值,爆靶穿深值均比20号钢弹体高且具有优异的碎屑性．

Abstract:

The preparation method of oil perforating bullet body by repressing and resintering powder is introduced. The influence of pressing pressure, time of holding pressure, forming way on texture and density distribution are studied. The results show that when the initial pressure is 600 MPa and repressing pressure is 800 MPa, the compaction structure and density is appropriate. When the compaction density exceeds 7.4 g/cm³, it does not increase with the pressure addition. High density powder metallurgy bullet body that has a certain density gradient distribution can be acquired by adopting extrusion strengthening compact compensation process, the average density of bullet body reaches 7.3 g/cm³, tensile strength and elongation are 647 MPa and 3.78％ respectively. The implosion contrasting results of different bullet body indicate that the penetration value and aperture of powder metallurgy bullet body exceeds the standard value on steel target and concrete target, the penetration value is higher than that of 20＃ steel bullet body and has a prominent debrital property.