CAJ | 학술논문

根据形变强化非调质钢螺栓的制造工序,对MFT8非调质钢原材料、冷拔和时效处理三种状态下的形变强化效应进行研究,比较了其形变硬化指数及力学性能,研究分析了组织对其性能的影响.结果表明:MFT8非调质钢形变强化效应明显;时效处理后仍具有良好的形变强化能力,可以确保螺栓在使用时的安全性;强化后的螺栓各项力学性能指标达到8.8级技术要求,研究材料能够取代调质钢制造高强度螺栓.
근거형변강화비조질강라전적제조공서,대MFT8비조질강원재료、랭발화시효처리삼충상태하적형변강화효응진행연구,비교료기형변경화지수급역학성능,연구분석료조직대기성능적영향.결과표명:MFT8비조질강형변강화효응명현;시효처리후잉구유량호적형변강화능력,가이학보라전재사용시적안전성;강화후적라전각항역학성능지표체도8.8급기술요구,연구재료능구취대조질강제조고강도라전.
According to manufactured procedures of the MFT8 bolt for microalloyed steel,the deformation strengthening effects for raw material, cold-drawing and aging treatment were studied, respectively.The strain hardening exponents and mechanical properties were compared, and the effects of microstructure on material properties were analyzed.The results show that deformation strengthening effect of the MFT8 bolt for microalloyed steel is obvious.It still possesses favorable deformation strengthening performance after aging treatment to insure the use safety of bolts.The standard of all kinds of mechanical properties of deformation strengthening bolt has reached 8.8 grade, therefore, the MFT8 for microalloyed steel can substitute quenched and tempered steel for manufacturing high-strengthened bolts.