锻压技术

740H镍基合金不同热变形工艺下的再结晶行为

英文标题：Recrystallization behavior of 740H nickel-based alloy under different thermal deformation processes

分类号：TG146.1

出版年,卷(期):页码：2025,50(3):231-242

摘要：

为支撑大口径镍基合金管的热变形工艺研究，分析不同壁厚区域热变形与镍基合金管的再结晶关系。采用热模拟试验机通过物理模拟试验方法结合金相分析和SEM观察，研究了740H镍基合金热变形过程中的再结晶行为及析出相特征。结果表明：热变形过程中740H镍基合金发生了明显的动态再结晶行为，变形参数对740镍基合金热变形后的晶粒形态具有重要影响，变形温度为1185 ℃、形变量为50%和70%、应变速率为0.1和0.01 s-1时，晶粒细小且均匀；变形温度为1250 ℃时，形变量为50%的试样存在不同程度的晶粒长大的现象。同时，经过能谱分析确定740H镍基合金变形过程中的析出物为γ′相。通过740H镍基合金动态再结晶行为研究，能够有效指导大口径镍基合金管挤压变形工艺研究。

To support the research on the thermal deformation process of large-diameter nickel-based alloy tubes, the relationship between thermal deformation in different wall thickness regions and recrystallization in nickel-based alloy tubes were anlayzed. Using a thermal simulation testing machine, the physical simulation experiments combined with metallographic analysis and SEM observations were conducted to study the recrystallization behavior and characteristics of precipitated phases in 740H nickel-based alloy during the thermal deformation. The results indicate that dynamic recrystallization (DRX) behaviour significantly occurred in 740H alloy during thermal deformation process. The deformation parameters have an important influence on the grain morphology of 740 nickel-based alloy after thermal deformation. When the deformation temperature is 1185 ℃, the deformation amount is 50% and 70%, and the strain rates are 0.1 and 0.01 s-1, the grains are fine and uniform. When the deformation temperature is 1250 ℃, the specimens with a deformation amount of 50% all exhibit the phenomenon of grain growth in varying degrees Meanwhile, the precipitates in the deformation process of 740H nickel-based alloy are γ′ phase by energy spectrum analysisThe study on the dynamic recrystallization behavior of 740H nickel-based alloy can effectively guide the research on the extrusion deformation process of large-diameter nickel-based alloy tubes.

基金项目：

作者简介：葛东伟（1985-），男，学士，高级工程师 E-mail：gedongwei20@163.com

参考文献：

[1]郭宏钢，王岩，李阳.617B镍基高温合金铸态组织热变形行为研究[J].热加工工艺，2013,42(24):51-53.

Guo H G, Wang Y, Li Y. Research on hot deformation behavior of as-cast structure of 617B nickel-base superalloy[J]. Hot Working Technology, 2013, 42(24): 51-53.

[2]赵双群，谢锡善，董建新.Inconel 740合金在空气和含有水蒸气的空气中的氧化研究[J].动力工程学报，2011, 31(10):797-802.

Zhao S Q, Xie X S, Dong J X. Oxidation resistance of Inconel 740 in static air or air-steam mixture[J]. Journal of Chinese Society of Power Engineering, 2011, 31(10): 797-802.

[3]江勇，赵双群，李维银.改进型Inconel 740镍基合金在模拟煤灰和烟气环境中的腐蚀行为[J].机械工程材料，2008,32(12):29-32,43.

Jiang Y, Zhao S Q, Li W Y. Corrosion behavior of modified Ni based alloy Inconel 740 in simulated coal-ash/flue-gas environments[J]. Materials for Mechanical Engineering, 2008, 32(12): 29-32,43.

[4]符锐，林福生，赵双群，等.Inconel 740H主要强化元素对热力学平衡相析出行为的影咖[J].动力工程学报， 2013,33(5):405-412.

Fu R, Lin F S, Zhao S Q, et al. Influence of strengthening elements on precipitation of thermodynamic equilibrium phases in Inconel alloy 740H[J]. Journal of Chinese Society of Power Enginecring, 2013, 33(5): 405-412.

[5]Wu Q. Microstructural characterization of advanced boiler materials for ultra supercritical coalpower plants[A].Proceedings to the Fourth International Conference on Advances in Materials Technology for Fossil Power Plants[C]. Materials Park, OH: ASM-International, 2005.

[6]Patel S J. Introduction to inconel alloy 740: An alloy designed for superheater tubing in coal-fired ultra supercritical boilers[J]. Acta Metallurgica Sinica, 2005, 18(4): 479-488.

[7]Evans N D, Maziasz P J, Swindeman R W, et al. Microstructure and phase stability in INCONEL alloy 740 during creep[J]. Scripta Materialia, 2004,51(6):503-507.

[8]Zhao S Q, Xie X S, Smith G D, et al. Research and improvement on structure stability andcorrosion resistance of nickel-base superalloy INCONEL alloy 740[J]. Materials and Design, 2006, 27(10): 1120-1127.

[9]赵双群，谢锡善，一种新型镍基高温合金长期时效后的组织和性能[J].金属学报，2003,39(4):399-404.

Zhao S Q,Xie X S. Properties and microstructure after Iong-term aging at different temperatures for a new nickel base superalloy[J]. Acta Metallurgica Sinica, 2003, 39(4): 399-404.

[10]张红军，周荣灿，侯淑芳，等，先进超超临界机组用Inconel 740合金的组织稳定性研究[J].中国电机工程学报，2011,31(8):108-113.

Zhang H J, Zhou R C, Hou S F, et al. Study on microstructure stability of Inconel 740 for advanced ultra supereritical unit[J]. Proceedings of the CSEE, 2011, 31(8): 108-113.

[11]赵双群，谢锡善，超超临界锅炉过热器管材的高温组织稳定性及其改进研究[J].材料导报，2004,18(8): 131-133.

Zhao S Q, Xie X S. High temperature structure stability and its improvement on superheater tube material for ultra-supercritical boilers[J]. Materials Review, 2004, 18(8): 131-133.

[12]谢锡善，赵双群，董建新，等，超超临界电站用Inconel 740镍基合金的组织稳定性及其改型研究[J].动力工程学报，2011,31(8):638-643.

Xie X S, Zhao S Q, Dong J X, et al. Structural stability and improvement of Inconel alloy 740 for ultra supereritical power plants[J]. Journal of Chinesc Society of Power Engineering, 2011, 31(8):638-643.

[13]赵双群，张麦仓，董建新，等. 新型高温合金700 ℃时效组织及力学性能[J].稀有金属材料与工程，2003, 32(12):991-994.

Zhao S Q, Zhang M C, Dong J X, et al. Mechanical properties and structure of new superalloys after prolonged aging at 700 ℃[J]. Rare Metal Materials and Engineering, 2003, 32(12): 991-994.

[14]GB/T 6394—2017, 金属平均晶粒度测定方法[S].

GB/T 6394—2017, Determination of estimating the average grain size of metal[S].

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