CAJ | 학술논문

在模拟工业化生产条件下研究C70250合金的热轧、固溶及时效处理工艺,对比C70250合金板坯的热轧、热轧+时效、热轧+冷轧+时效后合金的力学性能与导电性能,同时研究空冷与水冷对材料力学性能的影响.结果表明:时效析出为C70250合金的主要强化手段,时效前的塑性加工能使合金强度提高4%～5%.XRD分析表明:C70250合金铸锭经热轧开坯,在575～725 ℃之间保温1 h,析出相以Ni_2Si为主;合金开轧与终轧温度应控制在(900±50)～725 ℃之间,热轧板冷却速度不小于2.5 ℃/s;固溶处理制度为(900±50) ℃、1～3 h;时效工艺为400～ 450 ℃、4～6 h,该工艺制备的C70250合金抗拉强度不小于644 MPa,电导率IACS为40%,伸长率为8%.
재모의공업화생산조건하연구C70250합금적열알、고용급시효처리공예,대비C70250합금판배적열알、열알+시효、열알+랭알+시효후합금적역학성능여도전성능,동시연구공랭여수랭대재료역학성능적영향.결과표명:시효석출위C70250합금적주요강화수단,시효전적소성가공능사합금강도제고4%～5%.XRD분석표명:C70250합금주정경열알개배,재575～725 ℃지간보온1 h,석출상이Ni_2Si위주;합금개알여종알온도응공제재(900±50)～725 ℃지간,열알판냉각속도불소우2.5 ℃/s;고용처리제도위(900±50) ℃、1～3 h;시효공예위400～ 450 ℃、4～6 h,해공예제비적C70250합금항랍강도불소우644 MPa,전도솔IACS위40%,신장솔위8%.
Hot rolling, solid solution and ageing treatment of C70250 alloy were investigated by mimicking the commercial process. The mechanical and electrical properties of C70250 alloy were analyzed under hot rolling state, aging after hot rolling and aging after cold rolling following hot rolling. The effects of quenching and cooling by radiation on the mechanical properties were also investigated. The results show that aging precipitation is the primary strengthening method for the C70250 alloy. The plastic working prior to the aging process improves the tensile strength by 4%-5%. The hot working temperature should be controlled between (900±50) ℃ and 725 ℃ and followed with on-line quenching. The cooling velocity of hot rolling plate is equal to or higher than 2.5 ℃/s. XRD analysis results show that the main precipitation phase is Ni_2Si after C70250 alloy is hot rolled and kept at 575-725 ℃ for 1 h. The preferable off-line treatment process is heated at (900±50) ℃ for 1-3 h. The suitable aging process is 400-450 ℃ for about 4-6 h. The tensile strength, electrical conductivity (IACS) and elongation of the treated alloy are larger than 644 Mpa, 40% and 8%, respectively.