CAJ | 학술논문

采用维氏硬度测试、拉伸性能测试、透射电子显微镜(TEM)研究3种石油钻杆用 Al?Zn?Mg?Cu系合金(合金A： Al?6.9Zn?2.3Mg?1.7Cu?0.3Mn?0.17Cr，合金B： Al?8.0Zn?2.3Mg?2.6Cu?0.2Zr，合金C： Al?8.0Zn?2.3Mg?1.8Cu?0.18Zr)的显微组织和力学性能。结果表明，经(450°C,2 h)+(470°C,1 h)固溶处理及120°C时效12 h后，A、B和C 3种合金的抗拉强度、屈服强度和伸长率分别达到736 MPa、695.5 MPa和7%；711 MPa,674 MPa和12.5%；740.5 MPa,707.5 MPa和13%。合金A的强化相为细小弥散分布的GPII区和η′相；合金B的强化相为η′相；合金C的强化相为GPI区、GPII区和η′相，这是合金C具有较佳综合性能的原因。增加Zn含量有利于提高合金强度；增加Cu含量使合金强度略有下降，伸长率上升；增加Mn含量使合金基体内形成尺寸较大的第二相粒子，从而导致合金塑性的降低。
채용유씨경도측시、랍신성능측시、투사전자현미경(TEM)연구3충석유찬간용 Al?Zn?Mg?Cu계합금(합금A： Al?6.9Zn?2.3Mg?1.7Cu?0.3Mn?0.17Cr，합금B： Al?8.0Zn?2.3Mg?2.6Cu?0.2Zr，합금C： Al?8.0Zn?2.3Mg?1.8Cu?0.18Zr)적현미조직화역학성능。결과표명，경(450°C,2 h)+(470°C,1 h)고용처리급120°C시효12 h후，A、B화C 3충합금적항랍강도、굴복강도화신장솔분별체도736 MPa、695.5 MPa화7%；711 MPa,674 MPa화12.5%；740.5 MPa,707.5 MPa화13%。합금A적강화상위세소미산분포적GPII구화η′상；합금B적강화상위η′상；합금C적강화상위GPI구、GPII구화η′상，저시합금C구유교가종합성능적원인。증가Zn함량유리우제고합금강도；증가Cu함량사합금강도략유하강，신장솔상승；증가Mn함량사합금기체내형성척촌교대적제이상입자，종이도치합금소성적강저。
Three Al?Zn?Mg?Cu alloys used for oil drill pipes (Alloy A: Al?6.9Zn?2.3Mg?1.7Cu?0.3Mn?0.17Cr; Alloy B: Al?8.0Zn?2.3Mg?2.6Cu?0.2Zr, Alloy C: Al?8.0Zn?2.3Mg?1.8Cu?0.18Zr) were studied by hardness tests, tensile tests and transmission electron microscopy (TEM). The results show that the ultimate tensile strength, yield strength and elongation for Alloys A, B and C are 736 MPa, 695.5 MPa and 7%; 711 MPa, 674 MPa and 12.5%; 740.5 MPa, 707.5 MPa and 13%, respectively after solid solution treatment ((450 °C, 2 h)+(470 °C, 1 h)) followed by aging at 120 °C for 12 h. The dominant strengthening phases in Alloy A are GPII zone andη′ phase, the main precipitate in Alloy B isη′ phase, and the main precipitates in Alloy C are GPI zone, GPII zone andη′ phase, which are the reason for better comprehensive properties of Alloy C. The increase of zinc content leads to the improvement of the strength. The increase of copper content improves the elongation but slightly decreases the strength. Large second-phase particles formed by the increase in the manganese content induce a decrease in the elongation of alloys.