一种汽车发动机气阀用节镍型高温合金的固溶时效工艺  

Solution treatment and aging processes for a nickel-saving superalloy for automobile engine valve

作　　者：曾煜 吴畏 莫燕 Zeng Yu;Wu Wei;Mo Yan(Department of Mechanical Engineering,Luzhou Vocational and Technical College,Luzhou Sichuan 646000,China;Chongqing Materials Research Institute Co.,Ltd.,Chongqing 400707,China;National Engineering Research Center for Instrument Functional Materials,Chongqing 400707,China;Department of Criminal Technology,Sichuan Police College,Luzhou Sichuan 646000,China)

机构地区：[1]泸州职业技术学院机械工程学院,四川泸州646000 [2]重庆材料研究院有限公司,重庆400707 [3]国家仪表功能材料工程技术研究中心,重庆400707 [4]四川警察学院刑事技术系,四川泸州646000

出　　处：《金属热处理》2022年第2期188-192,共5页Heat Treatment of Metals

基　　金：国机集团重大科技专项(SINOMAST-ZDZX-2018-05);国机集团重大科技专项计划子任务(SINOMAST-ZDZX-2019-03);刑事检验四川高校重点实验室开放课题(2019ZD01)。

摘　　要：研究了不同热处理工艺下汽车发动机气阀用节镍型高温合金的微观组织、硬度及力学性能。试验结果表明,在900~1100℃固溶温度范围内,该材料的晶粒尺寸随温度的升高逐渐增大,硬度逐渐降低,1050℃后晶粒长大明显、急剧粗化,固溶温度宜选择为1000~1050℃,以保证主要强化相必要的析出条件且具有适宜的晶粒度;在700~760℃时效温度范围内,该材料的强度随时效温度的升高而逐渐增强,但韧塑性逐渐降低。当固溶时效工艺为1020℃×30 min固溶(水冷)+720℃×4 h时效(空冷)时,该节镍型高温合金可获得良好的强韧性匹配,满足技术要求。Microstructure, hardness and mechanical properties of a nickel-saving superalloy for automobile engine valve treated by different heat treatments were studied. The results show that the grain size of the tested alloy increases and the hardness decreases with the increase of solution treatment temperature in the range of 900-1100 ℃. When the temperature exceeds 1050 ℃, the grains grow clearly and coarsen rapidly. The solution treatment temperature should be controlled in the range of 1000-1050 ℃ to ensure the necessary precipitation conditions of the main strengthening phase and to obtain appropriate grain size. In the range of 700-760 ℃, the strength of the tested alloy increases gradually with the increase of aging temperature, but the ductility decreases gradually. When the solution treatment and aging processes are 1020 ℃×30 min(solution treatment with water cooling)+720 ℃×4 h(aging with air cooling), the tested nickel-saving superalloy can obtain preferable combination of strength and toughness and can meet the technical requirements.

关 键 词：气阀高温合金 节镍型金属材料 固溶 时效 力学性能 

分 类 号：TG156.1[金属学及工艺—热处理] TH142.2[金属学及工艺—金属学]