王冲 王磊 段然 田强 黄烁 赵光普. 固溶后处理对GH4706合金时效析出相演化及力学性能的影响[J]. 金属学报, 10.11900/0412.1961.2024.00090.

摘要 相关文章 Metrics 全文: PDF(3341 KB)   摘要: 针对大尺寸涡轮盘固溶后处理冷却速率受限的问题，以直径1500 mm的GH4706合金盘锻件为对象，研究了980℃固溶4 h后分别进行空冷(AA)、炉冷至825℃稳定化处理后空冷(FSA)、炉冷至825℃后空冷(FA)和炉冷至825℃后石棉冷却(FAs) 4种固溶后处理对合金时效析出相演化特征及力学性能的影响。结果表明：降低980~825℃间的冷速，促进了晶界η相的析出和长大，消耗了Ni、Ti元素，抑制了大尺寸η相周围γ'/γ"相析出，形成了胞状组织；降低825~600℃间的冷速，显著加速了γ'/γ"相长大呈立方状；FSA、FA和FAs处理后胞状组织体积分数分别为4.1%、1.0%和1.8%。AA和FA处理基本不影响合金室温拉伸性能，FSA处理小幅降低了合金的拉伸塑性，FAs处理大幅损害了合金的室温屈服强度。胞状组织加速了合金室温冲击中裂纹的形成和扩展，造成FSA处理合金冲击韧性较AA处理降低64%。但胞状组织可阻碍合金650℃持久实验过程中裂纹扩展并抑制微孔长大聚集，提高了合金的持久寿命。FAs处理时由于大尺寸γ'/γ"相降低了合金强度，从而缩短持久寿命。FA处理使合金析出了适量的胞状组织，显著提高了合金持久寿命，同时保持良好的室温拉伸和冲击性能，具有优异的综合性能。 关键词 ： GH4706合金,  固溶后冷却,  胞状组织,  冲击韧性,  持久性能     Abstract：GH4706 alloy is used for industrial gas turbine disks owing to its excellent properties, including high creep resistance, tensile strength, toughness, and microstructural stability up to approximately 650°C. However, the increasing weight and size of large turbine disks have limited the cooling rate following the solution treatment, which does not favor the control of the microstructure and mechanical properties of largeGH4706 alloy disks. Herein, four solution post-treatments were conducted on a 1500-mm-diameter disk manufactured from GH4706 alloy after being treated at 980°C for 4 h: air cooling (AA), furnace cooling to 825°C and stabilization treatment followed by air cooling (FSA), furnace cooling to 825°C followed by air cooling (FA), and furnace cooling to 825°C followed by asbestos cooling (FAs). The evolution of precipitates during aging (including for γ'/γ" coprecipitation and η-phase precipitation) and their effects on mechanical properties were analyzed. Results indicated that reducing the cooling rate from 980°C to 825°Cpromoted the precipitation and growth of the η phase, leading to Ni and Ti consumptions. This inhibited γ'/γ" coprecipitation around the large η phase, thereby favoring the formation of a cellular microstructure. Further reduction in cooling rate from 825°C to 600°C substantially accelerated the growth of γ'/γ" coprecipitates into cubic forms. The volume fractions of the cellular microstructure in the FSA, FA, and FAs treatments were 4.1%, 1.0%, and 1.8%, respectively. The AA and FA treatments had negligible effects on the tensile properties of GH4706 alloy at room temperature; meanwhile, the FSA treatment slightly decreased tensile ductility. The FAs treatment led to a notable reduction in yield strength at room temperature. In impact testing at room temperature, the cellular microstructure accelerated crack initiation and propagation, resulting in a 64% lower impact toughness of GH4706 alloy for the FSA treatment compared to that for the AA treatment. However, during stress rupture testing at 650°C, the cellular microstructure effectively hindered crack propagation and the growth and aggregation of micropores, thereby extending the rupture life. However, the FAs treatment reduced the rupture life due to strength loss caused by the large γ'/γ" coprecipitates. The FA treatment fostered an optimal level of cellular microstructure, thereby increasing the rupture life while maintaining excellent tensile and impact properties at room temperature, demonstrating remarkable overall mechanical properties. Key words： GH4706 alloy    cooling rate after solution treatment    cellular microstructure    impact toughness    stress rupture property 收稿日期: 2024-03-25      基金资助:国家重点研发计划项目 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 王冲 王磊 段然 田强 黄烁 赵光普 44.8K 链接本文: https://www.ams.org.cn/CN/Y0/V/I/0 [1] 刘金来, 孙晶霞, 孟杰, 李金国. 一种第三代单晶高温合金的组织稳定性与持久性能[J]. 金属学报, 2024, 60(6): 770-776. [2] 张子轩, 于金江, 刘金来. 镍基单晶高温合金DD432的持久性能各向异性[J]. 金属学报, 2023, 59(12): 1559-1567. [3] 朱东明, 何江里, 史根豪, 王青峰. 热输入对Q500qE钢模拟CGHAZ微观组织和冲击韧性的影响[J]. 金属学报, 2022, 58(12): 1581-1588. [4] 蒋中华, 杜军毅, 王培, 郑建能, 李殿中, 李依依. M-A岛高温回火转变产物对核电SA508-3钢冲击韧性影响机制[J]. 金属学报, 2021, 57(7): 891-902. [5] 郭小童, 郑为为, 李龙飞, 冯强. 冷却速率导致的薄壁效应对K465合金显微组织和持久性能的影响[J]. 金属学报, 2020, 56(12): 1654-1666. [6] 万响亮, 胡锋, 成林, 黄刚, 张国宏, 吴开明. 两步贝氏体转变对中碳微纳结构钢韧性的影响[J]. 金属学报, 2019, 55(12): 1503-1511. [7] 邵毅, 李彦默, 刘晨曦, 严泽生, 刘永长. 低碳铁素体不锈钢高频直缝电阻焊管退火工艺优化[J]. 金属学报, 2019, 55(11): 1367-1378. [8] 文明月, 董文超, 庞辉勇, 陆善平. 一种Fe-Cr-Ni-Mo高强钢焊接热影响区的显微组织与冲击韧性研究[J]. 金属学报, 2018, 54(4): 501-511. [9] 杜瑜宾, 胡小锋, 姜海昌, 闫德胜, 戎利建. 回火时间对Fe-Cr-Ni-Mo高强钢碳化物演变及力学性能的影响[J]. 金属学报, 2018, 54(1): 11-20. [10] 舒志强,袁鹏斌,欧阳志英,龚丹梅,白雪明. 回火温度对26CrMo钻杆钢显微组织和力学性能的影响[J]. 金属学报, 2017, 53(6): 669-676. [11] 李学达,尚成嘉,韩昌柴,范玉然,孙建波. X100管线钢焊接热影响区中链状M-A组元对冲击韧性和断裂机制的影响*[J]. 金属学报, 2016, 52(9): 1025-1035. [12] 王学林,董利明,杨玮玮,张宇,王学敏,尚成嘉. Mn/Ni/Mo配比对K65管线钢焊缝金属组织与力学性能的影响*[J]. 金属学报, 2016, 52(6): 649-660. [13] 蒋中华,王培,李殿中,李依依. 回火温度对2.25Cr-1Mo-0.25V钢粒状贝氏体显微组织和力学性能的影响*[J]. 金属学报, 2015, 51(8): 925-934. [14] 童锦艳,冯微,付超,郑运荣,冯强. GH4033合金短时超温后的显微组织损伤及力学性能[J]. 金属学报, 2015, 51(10): 1242-1252. [15] 赵云松,张剑,骆宇时,唐定中,冯强. Hf对第二代镍基单晶高温合金DD11高温低应力持久性能的影响[J]. 金属学报, 2015, 51(10): 1261-1272. Viewed Full text Abstract Cited   Shared      Discussed