Please wait a minute...
金属学报    DOI: 10.11900/0412.1961.2026.00060
  本期目录 | 过刊浏览 |
温度和应变速率对GH4738合金热变形行为的影响
蒋壮壮1,2, 盖永超2, 张瑞2, 张伟红2, 宋艳丽3, 曹一超4, 赵斌5, 安宁5, 周子荐2, 陶稀鹏2, 崔传勇2, 周亦胄2

1 东北大学 材料科学与工程学院  沈阳 110819

2 中国科学院金属研究所 沈阳材料国家研究中心  沈阳 110016

3 安泰科技股份有限公司  北京 100081

4 中国航发沈阳黎明航空发动机有限责任公司  沈阳 110043

5 北京北冶功能材料有限公司  北京 100192

Influence of Temperature and Strain Rate on the Hot Deformation Behavior of GH4738 Alloy

JIANG Zhuangzhuang 1,2, GAI Yongchao 2, ZHANG Rui 2, ZHANG Weihong 2, SONG Yanli 3, CAO Yichao4, ZHAO Bin 5, AN Ning 5, ZHOU Zijian 2, TAO Xipeng 2, CUI Chuanyong 2, ZHOU Yizhou 2

1 School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

2 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

3 Antai Technology Co. Ltd., Beijing 100081, China

4 AECC Shenyang Liming Aero-Engine Co. Ltd., Shenyang 110043, China

5 Beijing Beiye Functional Materials Corporation, Beijing 100192, China

引用本文:

蒋壮壮, 盖永超, 张瑞, 张伟红, 宋艳丽, 曹一超, 赵斌, 安宁, 周子荐, 陶稀鹏, 崔传勇, 周亦胄. 温度和应变速率对GH4738合金热变形行为的影响[J]. 金属学报, DOI: 10.11900/0412.1961.2026.00060.

全文: PDF(5071 KB)  
摘要: GH4738合金薄带材因宽厚比大,在热加工过程中存在温降快的特点,易从γ′单相区降低至γ+γ′双相区,从而导致热裂敏感性高和组织不均,针对上述问题,本文采用Gleeble-3800热模拟试验机在950~1100 ℃、0.01~10 s-1条件下进行热压缩实验,结合OM、SEM及EBSD表征技术,系统研究了合金从亚固溶到过固溶区的组织演变规律和动态再结晶(DRX)机制,并基于动态材料模型构建了热加工图。结果表明:流变应力随温度升高而降低,在γ′相回溶温度(~1034 ℃)附近降幅最大(>150 MPa);基于Arrhenius双曲正弦模型建立的本构方程相关性良好(R² > 0.98),并计算得到热变形激活能为796.75 kJ/mol。热加工图分析表明,合金在温度950~954 ℃,应变速率0.01~0.3 s-1变形条件下为流变失稳区,其余参数范围内均为安全加工区;在温度1040~1095 ℃、应变速率0.14~0.61 s-1时,合金的功率耗散效率较高且组织均匀,为该合金的最优热加工窗口。在亚固溶温度下合金以晶界弓弯为特征的非连续动态再结晶(DDRX)机制为主,此时再结晶程度较低;在过固溶温度下DRX较为充分,但在高速率下因变形时间短导致晶粒尺寸分布不均匀,此时DRX过程存在连续动态再结晶机制(CDRX)。高速率变形通过增大储存能促进再结晶形核,但温升效应使晶粒略有粗化。本研究可为GH4738合金热轧宽幅带材终轧温度控制及工艺优化提供理论依据。
关键词 GH4738合金热变形再结晶本构方程热加工图    
Abstract:Owing to the large width-to-thickness ratio, GH4738 alloy thin strips experience rapid temperature reduction during hot working, readily transitioning from the γ′ single-phase region to the γ+γ′ dual-phase region, thereby leading to high hot cracking sensitivity and microstructural inhomogeneity. To address these issues, hot compression tests were conducted on a Gleeble-3800 thermomechanical simulator at temperatures of 950~1100 ℃ and strain rates of 0.01~10 s-1. Combined with OM, SEM, and EBSD characterization techniques, the microstructural evolution and dynamic recrystallization (DRX) mechanisms from the sub-solvus to super-solvus regions were systematically investigated, and a hot processing map was constructed based on the dynamic material model (DMM). The results indicate that the flow stress decreases with increasing temperature, with the most significant reduction (>150 MPa) observed near the γ′ dissolution temperature (~1034 ℃). The constitutive equation established based on the Arrhenius hyperbolic sine model exhibits excellent correlation (R² > 0.98), yielding a hot deformation activation energy of 796.75 kJ/mol. Hot processing map analysis reveals that the alloy exhibits flow instability in the temperature range of 950~954 ℃ and strain rates of 0.01~0.3 s-1, whereas safe processing occurs under other parameter conditions. The optimal hot processing window is identified at temperatures of 1040~1095 ℃ and strain rates of 0.14~0.61 s-1, where the alloy exhibits high power dissipation efficiency and homogeneous microstructure. In the sub-solvus temperature regime, the alloy primarily exhibits discontinuous dynamic recrystallization (DDRX) characterized by grain boundary bulging, resulting in limited recrystallization; under super-solvus conditions, DRX proceeds more completely, but grain size heterogeneity occurs at high strain rates due to insufficient deformation time, with the DRX process involving continuous dynamic recrystallization (CDRX) mechanisms. High strain rate deformation promotes recrystallization nucleation through increased stored energy, though adiabatic heating effects cause slight grain coarsening. This study provides a theoretical basis for the finish rolling temperature control and process optimization of GH4738 alloy thin strips.
Key wordsGH4738 alloy    hot deformation    recrystallization    constitutive equation    hot processing map
收稿日期: 2026-03-02     
基金资助:国家科技重大专项(2024ZD0600600); 辽宁省科技重大专项(2024JH1/117000037); 中国科学院C类先导专项(XDC0140000); 中国科学院青年创新促进会项目(2023202); 山东省自然科学基金(ZR2024QE407)
[1] 秦志伟, 王彬, 赵强, 李家辰, 孙毓涛, 洪小龙, 李鹏, 董红刚. 热处理对GH4065A/IN718异质高温合金惯性摩擦焊接头界面微观组织的影响[J]. 金属学报, 2026, 62(6): 1032-1042.
[2] 孙玉崇, 刘志敏, 徐振, 田双永, 田爽. Zr含量对Al-Mg-Si铸轧薄板再结晶行为和力学性能的影响[J]. 金属学报, 2026, 62(3): 421-430.
[3] 赵霞, 王旻, 郝宪朝, 张龙, 高明, 马颖澈, 刘奎. 晶界碳化物和动态再结晶对690合金柱状晶凝固组织高温塑性的影响[J]. 金属学报, 2026, 62(2): 339-350.
[4] 郑德宇, 夏玉峰, 曾扬, 周杰. 水平集法模拟GH4706合金动态再结晶过程[J]. 金属学报, 2025, 61(9): 1425-1437.
[5] 张洺川, 徐勤思, 刘意, 蔡雨升, 牟义强, 任德春, 吉海宾, 雷家峰. 热压温度对TC4合金扩散连接区组织与性能的影响[J]. 金属学报, 2025, 61(8): 1183-1192.
[6] 葛蓬华, 张勇, 李志明. 异构FeCoNi中熵合金的软磁与力学行为[J]. 金属学报, 2025, 61(7): 1119-1128.
[7] 姜沐池, 宫继双, 杨兴远, 任德春, 蔡雨升, 李秉洋, 吉海宾, 雷家峰. Ti30Ni50Hf20 高温形状记忆合金的热变形行为[J]. 金属学报, 2025, 61(6): 857-865.
[8] 包成利, 李豪, 胡励, 周涛, 唐明, 何曲波, 刘相果. 固溶态Mg-10Gd-6Y-1.5Zn-0.5Zr合金热加工图构建及微观组织演变[J]. 金属学报, 2025, 61(4): 632-642.
[9] 周雯慧, 熊锦涛, 黄思程, 王鹏昊, 刘勇. AZ31镁合金双峰组织形成机制及其变形行为[J]. 金属学报, 2025, 61(3): 488-498.
[10] 彭子超, 罗俊鹏, 赵宇, 周磊, 王旭青, 邹金文. FGH96合金静态再结晶过程的显微组织演化[J]. 金属学报, 2025, 61(2): 235-242.
[11] 刘光辉, 王卫国, Rohrer Gregory S, 陈松, 林燕, 童芳, 冯小铮, 周邦新. 高温压缩变形Al-Zn-Mg-Cu合金动态再结晶后的{111}/{111}近奇异晶界[J]. 金属学报, 2024, 60(9): 1165-1178.
[12] 杨瑞泽, 翟汝宗, 任少飞, 孙明月, 徐斌, 乔岩欣, 杨兰兰. 1Cr22Mn16N高氮奥氏体不锈钢塑性变形连接中界面组织演化及愈合机制[J]. 金属学报, 2024, 60(7): 915-925.
[13] 李天瑞, 许瑜倩, 吴文平, 甘文萱, 杨永, 刘国怀, 王昭东. VB元素对Ti-44Al-5Nb-1Mo合金显微组织及热变形机制的影响[J]. 金属学报, 2024, 60(5): 650-660.
[14] 江浩文, 彭伟, 范增为, 汪杨鑫, 刘腾轼, 董瀚. Ag对奥氏体不锈钢组织和力学性能的影响[J]. 金属学报, 2024, 60(4): 434-442.
[15] 田滕, 查敏, 殷皓亮, 花珍铭, 贾海龙, 王慧远. 低温高应变量衬板控轧高固溶Al-Mg合金高强塑性与高热稳定性机制[J]. 金属学报, 2024, 60(4): 473-484.