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均匀化处理对 GH4706 合金组织及 力学性能的影响
Effect of HomogenizationTreatmenton the Microstructureand MechanicalPropertiesof GH4706 Alloy
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- DOI:
- 作者:
- 徐烨玲 1，段然 2，王冲 3，黄嘉良 1，侯翔益 1，廉心桐 1，4，黄烁 2
XU Yeling1,DUAN Ran2,WANG Chong3,HUANG Jialiang1,HOU Xiangyi1, LIAN Xintong1, 4,HUANG Shuo2
- 作者单位:
- 1. 上海大学 材料科学与工程学院，上海 200444；2. 北京钢研高纳科技股份有限公司，北京 100081；3.东北大学 材料科 学与工程学院，辽宁 沈阳 110004；4. 上海大学(浙江)高端装备基础件材料研究院，浙江 嘉兴 314100
1. School of Materials Science and Engineering, Shanghai University, Shanghai 200444,China; 2. Gaona Aero Material Co., Ltd., Beijing 100081,China; 3. School of Materials Science and Engineering, Northeastern University, Shenyang 110004, China; 4. Zhejiang Institute of Advanced Materials, SHU, Jiaxing 314100,China
- 关键词:
- GH4706 合金；铸态组织；偏析；均匀化；拉伸性能
GH4706 alloy; as-cast microstructure; segregation; homogenization; tensile property
- 摘要:
- 在 GH4706 合金铸锭的凝固过程中，存在元素偏析、碳化物及 Laves 相等析出相，影响合金热塑性和热加工性，从而影响后续锻造，须通过适当的均匀化处理有效消除元素偏析和有害析出相。 本文利用金相显微镜、扫描电镜、能谱分析、JMatPro 软件等方法，分析 GH4706 合金铸锭心部、R/2(R 为半径)和边缘的组织差异性及溶质元素偏析规律、均匀 化 处 理 过 程 中 的 微 观 组 织 演 变 规 律 以 及 对 拉 伸 性 能 的 影 响 。 研究 表 明 ，GH4706 合金 的 基 体 为 γ 相 ， 主要 析出相为 η 相、Laves 相 、γ+γ′共晶 组 织 、M(C, N)，合金 中 的 主 要 正 偏 析 元 素 为 Ti、Ni、Nb，负偏 析 元 素 为 Cr、Fe。 采取1160 ℃× 10 h+1190 ℃×30 h 的均匀化工艺，可有效消除原始铸态枝晶，Cr、Ni、Nb、Ti 等元素偏析，达到合适的均匀效果。 均匀化处理后，GH4706 合金的塑性在 600 ℃时比均匀化前提高了 154%，但在 800 ℃时出现了中温脆性。During the solidification process of GH4706 alloy ingots, element segregation and precipitation phases affect the thermoplasticity and hot workability of the alloy, thereby affecting subsequent forging. Proper homogenization treatment is necessary to eliminate element segregation and harmful precipitation phases. Differences in the microstructure and element segregation at different positions (center, R/2 and edge) of the GH4706 alloy ingot were observed via metallographic microscopy, SEM, EDS and JMatPro software. Then, the microstructure evolution during homogenization treatment and its effects on tensile properties were analysed. Research has shown that the matrix of the GH4706 alloy is the γ phase, and the main precipitated phases are the η phase, γ +γ′ eutectic phase, Laves phase, and M (C, N) phase. The main positive segregation elements in the alloy are Ti, Ni, and Nb, and the negative segregation elements are Cr and Fe. The original as-cast dendrites and the segregation of Cr, Ni, Nb, and Ti can be effectively eliminated after a homogenization treatment of 1 160 ℃×10 h+1 190 ℃×30 h, thus achieving a suitable uniformity effect. Moreover, the plasticity of the GH4706 alloy at 600 ℃ increases by 154% after homogenization, but intermediate-temperature brittleness (ITB) appears at 800 ℃.