摘要
针对不同Nb、Al、Ti含量的GH4169合金,对其进行固溶时效热处理,研究微观组织与拉伸性能的变化规律。研究表明,一定的Al/Ti和(Al+Ti)/Nb值下,随Nb含量增加,δ相含量增加,并且具有较好的高温稳定性,高温固溶可有效阻止晶粒的长大,主要通过稳定的δ相来保证合金的细晶强化。当Al/Ti与(Al+Ti)/Nb比值较低时,时效后γ″、γ'含量有所降低,γ″相形貌由唇状变为圆盘或芝麻粒状,其中Nb元素主要形成δ相。力学性能表明,Al/Ti和(Al+Ti)/Nb值一定时,拉伸强度主要受晶粒尺寸影响,而δ相含量影响较小。但当Al/Ti与(Al+Ti)/Nb比值较低时,由于强化相γ″和γ'数量与形貌的变化,拉伸力学性能显著降低,其微观硬度也随拉伸强度的降低而降低。
The microstructure and tensile properties of GH4169 alloy with different Nb,Al and Ti contents were studied after solution and aging treatment.The results show that under certain Al/Ti and(Al+Ti)/Nb ratios,theδphase increases in amount with the increase of Nb content and has better high temperature stability;meanwhile,the high temperature solution treatment can effectively prevent grain growth and ensure the fine grain strengthening by the stableδphase.When the Al/Ti and(Al+Ti)/Nb ratios are relatively low,the contents of γ″and γ’phases decrease,and the morphology of γ″changes from lip-shape to disc-shape or sesame-like shape,in this case the Nb element will mainly formδphase.The results of mechanical properties show that when the Al/Ti and(Al+Ti)/Nb ratios are similar,the tensile strength is mainly affected by grain size,while the effect ofδphase content is less.However,when the Al/Ti and(Al+Ti)/Nb ratios are relatively low,due to the quantity and morphology changes of the strengthening phasesγ″and γ’,the tensile properties are significantly poorer,and the microhardness also decreases along with the decrease of tensile strength.
作者
马军
申佳林
李茂明
梁宇
Ma Jun;Shen Jialin;Li Maoming;Liang Yu(School of Materials Science and Engineering,Guizhou University,Guiyang Guizhou 550025,China;Key Laboratory of Material Structure and Strength,Guiyang Guizhou 550025,China;National and Local Joint Engineering Laboratory of High Performance Metal Structural Materials and Manufacturing Technology,Guiyang Guizhou 550025,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2020年第12期197-204,共8页
Heat Treatment of Metals
基金
国家自然科学基金(51761003)
贵州省自然科学基金([2017]5788)
黔科合平台人才([2020]6006)。
关键词
GH4169合金
合金元素
力学性能
组织
GH4169 alloy
alloying element
mechanical properties
microstructure
