锻压技术

变形温度对GH4742高温合金γ′相的影响

英文标题：Influence of deformation temperature on γ′ phases for superalloy GH4742

作者：王玉龙1 王松辉1 2 3 苏海1 徐东1 葛金锋1 奚晓1 黄常勋1 罗通1 王文珂4 任彩霞1

单位：1.中航工业贵州安大航空锻造有限责任公司贵州安顺 561005 2. 贵州科学院贵州贵阳 550001 3. 中国科学院金属研究所辽宁沈阳 110016 4. 哈尔滨工业大学材料科学与工程学院黑龙江哈尔滨 150001

分类号：TG306

出版年,卷(期):页码：2025,50(6):234-240

摘要：

采用Gleeble-3500试验机对GH4742高温合金进行了等温恒应变速率压缩实验。结果表明：来料状态的γ′相呈现3种形貌尺寸。当应变速率较小（0.001 s-1）时，γ′I和γ′II相在温度≥1090 ℃时完全溶解，γ′III相在≤1020 ℃时完全溶解。在950~1020 ℃时，γ′I相的等效直径和体积分数随着温度的升高而增大，但升高至1055 ℃时又有所下降。在950~1055 ℃时，γ′II相的等效直径随着温度的升高而下降，但体积分数变化不大。新析出γ′III相的等效直径在1055~1160 ℃时变化不大。当应变速率较大（1 s-1）时，影响规律与0.001 s-1时大致相同，但γ′II相完全溶解的温度降至1055 ℃，且新析出γ′III相的体积分数较0.001 s-1时有所增加。为充分溶解γ′相以降低变形抗力，GH4742高温合金的始锻温度以不低于1090 ℃为宜。

Isothermal constant strain rate compression experiments were conducted on superalloy GH4742 by using simulator Gleeble-3500. The results show that γ′ phases of as-received materials exhibits three morphology sizes. When the strain rate is small (0.001 s-1), γ′I and γ′II phases are completely dissolved at the temperature greater than or equal to 1090 ℃, γ′III phase is completely dissolved at the temperature less than or equal to 1020 ℃. The equivalent diameter and volume fraction of γ′I phase increase with the increasing of temperature from 950 ℃ to 1020 ℃, but decrease when it rises to 1055 ℃. The equivalent diameter of γ′II phase decreases with the increasing of temperature from 950 ℃ to 1055 ℃, but the volume fraction does not change much. The equivalent diameter of the newly precipitated γ′III phase does not change much from 1055 ℃ to 1160 ℃. When the strain rate is large (1 s-1), the influence law is roughly the same as that at 0.001 s-1, except that the temperature at which γ′II phase is completely dissolved drops to 1055 ℃, and the volume fraction of the newly precipitated γ′III phase increases compared with that at 0.001 s-1. Thus, in order to fully dissolve γ′ phase to reduce deformation resistance, the initial forging temperature of superalloy GH4742 should be no lower than 1090 ℃.

基金项目：

新材料重大专项项目（2024ZD0600100）；贵州省高层次创新型人才项目（GCC[2023]098）；贵州省科技计划项目（CXTD[2023]009，ZZSG[2024]016，[2023]一般278）；安顺市“两城三基地”青年科技人才培养项目（安市科人[2024]3号）

作者简介：王玉龙（1981-），男，学士，工程师，E-mail：32154545@qq.com；通信作者：王松辉（1991-），男，博士，高级工程师，E-mail：wangsonghui91@126.com

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