Transactions of Materials and Heat Treatment

Title：Microstructure characteristics and strengthening mechanism of Fe-Ni-based superalloy GH2070P(HT700P) seamless tube under extrusion forming process

Authors： Li Yuanyuan Qin Ruiting Chen Xiangang Zhou Zhongcheng Wang Yanling Zhang Ziyang

Unit： Special Steel Division Inner Mongolia North Heavy Industries Group Corp. Ltd.

KeyWords： Fe-Ni-based super alloy HT700P extrusion forming microstructure mechanical properties second-phase precipitation strengthening

ClassificationCode：TG376.9

year,vol(issue):pagenumber：2025,50(3):255-261

Abstract：

Fe-Ni based superalloy HT700P seamless tubes were trial-produced by 150 MN blank making machine and 360 MN extruder, and the tensile properties, microstructure, macro inclusions, grain size and characteristics of second-phase precipitates for the trial-produced Fe-Ni based superalloy HT700P seamless tubes at a series of temperatures were systematically characterized. The results show that after solution treatment, the average yield strength of Fe-Ni based superalloy HT700P at room temperature is about 343 MPa, and the average yield strength at 700 ℃ is about 380 MPa. The trial-produced superalloy mainly consists of austenite structure, with an average grain diameter of about Φ99.3 μm and a grain size of about 3.0. The non-metallic inclusions are mainly type B and type D non-metallic inclusions, and the inclusion grades are all 0.5. The strengthening mechanisms of the trial-produced Fe-Ni based superalloy HT700P seamless tube is mainly fine grain strengthening and second-phase precipitation strengthening, and the strength contribution caused by fine grain strengthening and second-phase precipitation strengthening accounts for about 30.7% and 66.9% of the total strengthening, respectively.

Funds：

作者简介：李媛媛（1992-），女，硕士，工程师 E-mail：m15661492881@163.com 通信作者：秦瑞廷（1986-），男，硕士，高级工程师 E-mail：842810041@qq.com

Reference：

[1]王倩, 王卫良, 刘敏, 等. 超（超）临界燃煤发电技术发展与展望[J]. 热力发电, 2021, 50(2): 1-9.

Wang Q, Wang W L, Liu M, et al. Development and prospect of (ultra) supercritical coalfired power generation technology[J]. Thermal Power Generation, 2021, 50(2): 1-9.

[2]纪世东, 周荣灿, 王生鹏, 等. 700 ℃等级先进超超临界发电技术研发现状及国产化建议[J]. 热力发电, 2011, 40(7): 86-88.

Ji S D, Zhou R C, Wang S P, et al. Research and development status of advanced ultra supercritical power generation technology at 700 ℃ level and suggestions for localization[J]. Thermal Power Generation, 2011, 40(7): 86-88.

[3]刘入维, 肖平, 钟犁, 等. 700 ℃超超临界燃煤发电技术研究现状[J]. 热力发电, 2017, 46(9): 1-8.

Liu R W, Xiao P, Zhong L, et al. Research progress of advanced 700 ℃ ultrasupercritical coalfired power generation technology[J]. Thermal Power Generation, 2017, 46(9): 1-8.

[4]张涛, 郝丽婷, 田峰, 等. 700 ℃超超临界火电机组用高温材料研究进展[J]. 机械工程材料, 2016, 40(2): 1-6.

Zhang T, Hao L T, Tian F, et al. Research progress on high temperature materials for 700 ℃ ultrasupercritical coalfired unit[J]. Materials for Mechanical Engineering, 2016, 40(2): 1-6.

[5]毛健雄. 700 ℃超超临界机组高温材料研发的最新进展[J]. 电力建设, 2013, 34(8): 69-76.

Mao J X. Latest development of hightemperature metallic materials in 700 ℃ ultrasupercritical units[J]. Electic Power Construction, 2013, 34(8): 69-76.

[6]王岩,李吉东,谷宇,等.工业化生产N06625镍基合金板材组织性能[J].锻压技术,2024,49(3):47-51,93.

Wang Y，Li J D，Gu Y，et al.Microstructure and properties on N06625 nickelbased alloy plate produced in industrialization [J]. Forging & Stamping Technology，2024，49(3)：47-51，93.

[7]赵远, 岳庚新. 700 ℃超超临界火力发电机组高温压力管道用材研究进展[J]. 焊管, 2016, 39(9): 26-29.

Zhao Y, Yue G X. Research progress of high temperature pressure material used for 700 ℃ ultrasupercritical coalfired power unit[J]. Welded Pipe and Tube, 2016, 39(9): 26-29.

[8]杨成. 镍铁基高温合金GH2107组织热稳定性和力学性能的研究[D]. 沈阳：沈阳理工大学, 2016.

Yang C. The Research of the Thermal Stability and Mechanical Properties on the NiFe Base Superalloy GH2107[D]. Shenyang：Shenyang Ligong University,2016.

[9]袁勇，党莹樱，杨珍, 等. 700 ℃先进超超临界机组末级过热器用新型镍铁基高温合金的组织与性能[J].机械工程材料, 2020，44(1)：44-50.

Yuan Y, Dang Y Y, Yang Z, et al. Microstructure and properties of NiFebased superalloy for 700 ℃ advanced ultra supercritical unit final superheater[J]. Materials For Mechanical Engineering, 2020,44(1)：44-50.

[10]GB/T 2281—2021，金属材料拉伸试验第1部分：室温试验方法[S].

GB/T 2281—2021，Metallic materials—Tensile testing—Prat 1：Method of test at room temperature[S].

[11]GB/T 229—2020，金属材料夏比摆锤冲击试验方法[S].

GB/T 229—2020，Metallic materials—Charpy pendulum impact test method[S].

[12]GB/T 2311—2018，金属材料布氏硬度试验第1部分：试验方法[S].

GB/T 2311—2018，Metallic materials—Brinell hardness—Part 1：Test method[S].

[13]GB/T 10561—2023, 钢中非金属夹杂物含量的测定标准评级图显微检验法[S].

GB/T 10561—2023, Determination of content of nonmetallic inclusions in steel-Micrographic method using standard diagrams[S].

[14]张涛, 卫志刚, 田力男, 等. 700 ℃等级超超临界燃煤锅炉用金属材料应用分析[J]. 内蒙古电力技术, 2015, 33(5): 20-25.

Zhang T, Wei Z G, Tian L N, et al. Metal materials application analysis of 700 ℃ level advanced ultrasupercritical coalfired boiler[J]. Inner Mongolia Electric Power, 2015, 33(5): 20-25.

[15]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].

[16]Bhadeshia H. Models for the elementary mechanical properties of steel welds[J]. Bookinstitute of Materials, 1997, 650(1): 229-284.

[17]Hal E O. The deformation and ageing of mild steel:Ⅲ Discussion of results[J]. Physical Society Proceedings Section B, 1951, 64(6): 495-502.

[18]Liu Y, Li Z, Jiang Y X, et al. The microstructure evolution and properties of a CuCrAg alloy during thermalmechanical treatment[J]. Journal of Materials Research, 2017, 32(7): 1324-1332.

[19]Sun M X, Xu Y, Du W B. Influence of coiling temperature on microstructure, precipitation behaivors and mechanical properties of a low carbon Ti microalloyed steel[J]. Metals, 2020, 10(9): 1173.

[20]雍岐龙.钢铁结构材料中的第二相[M]. 北京:冶金工业出版社,2006.

Yong Q L. Secondary Phases in Steels[M]. Beijing：Metallurgical Industry Press, 2006.

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