<strong>850 ℃</strong>涡轮盘用新型变形高温合金<strong>GH4975</strong>挤压棒材热变形规律研究

doi:10.11900/0412.1961.2020.00074

金属学报

2020, Vol. 56

Issue (10): 1401-1410 DOI: 10.11900/0412.1961.2020.00074

本期目录 | 过刊浏览

850 ℃涡轮盘用新型变形高温合金GH4975挤压棒材热变形规律研究

张勇¹(

), 李鑫旭¹, 韦康¹, 万志鹏¹, 贾崇林¹, 王涛¹, 李钊¹, 孙宇², 梁红艳³

1 中国航发北京航空材料研究院先进高温结构材料重点实验室北京 100095
2 哈尔滨工业大学材料科学与工程学院哈尔滨 150001
3 天津大学材料科学与工程学院天津 300354

Hot Deformation Characteristics of Novel Wrought Superalloy GH4975 Extruded Rod Used for 850 ℃ Turbine Disc

ZHANG Yong¹(

), LI Xinxu¹, WEI Kang¹, WAN Zhipeng¹, JIA Chonglin¹, WANG Tao¹, LI Zhao¹, SUN Yu², LIANG Hongyan³

1 Key Laboratory of Science & Technology on Advanced High Temperature Structural Materials, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China
2 School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
3 School of Materials Science and Engineering, Tianjin University, Tianjin 300354, China

引用本文:

张勇, 李鑫旭, 韦康, 万志鹏, 贾崇林, 王涛, 李钊, 孙宇, 梁红艳. 850 ℃涡轮盘用新型变形高温合金GH4975挤压棒材热变形规律研究[J]. 金属学报, 2020, 56(10): 1401-1410.
Yong ZHANG, Xinxu LI, Kang WEI, Zhipeng WAN, Chonglin JIA, Tao WANG, Zhao LI, Yu SUN, Hongyan LIANG. Hot Deformation Characteristics of Novel Wrought Superalloy GH4975 Extruded Rod Used for 850 ℃ Turbine Disc[J]. Acta Metall Sin, 2020, 56(10): 1401-1410.

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摘要:

采用真空感应熔炼+真空自耗重熔工艺制备铸锭，通过挤压开坯方法制备出了GH4975合金细晶棒材。利用Gleeble 1500热模拟试验机研究了GH4975合金在变形温度为1070~1220 ℃、应变速率为0.001~1 s^-1条件下的热变形行为。结果表明，GH4975合金的应力-应变曲线具有典型的动态再结晶特征，存在应变硬化、流变软化和稳态流变3个阶段。基于GH4975合金挤压棒材的应力-应变曲线，建立了热变形参数本构方程，其热变形激活能(Q)为664587 J/mol；根据动态材料模型，构建了合金挤压棒材的热加工图，结合微观组织分析，确定了合金合适的热加工工艺范围。GH4975合金在1100~1130 ℃温度条件下易发生动态再结晶，其再结晶机制为应变诱导晶界形核。

关键词 ：涡轮盘, 变形高温合金, GH4975, 挤压, 热变形, 动态再结晶

Abstract：

With the development of aero-engine in the direction of high thrust ratio, high efficiency and high reliability, the indicators of temperature resistance of cast & wrought superalloys are getting higher and higher. For the demand of aero-engine, the wrought superalloy materials used for aero engine turbine disc have been made remarkable progress. Form heat-resistant steel which temperature capability reaches 550 ℃ to iron-nickel based superalloy used at 650 ℃, and the high alloyed wrought superalloy with service temperature of 750 ℃ have been developed. The nickel-based wrought superalloy GH4975 is a high strength, complex alloying, hard-deformed wrought turbine disc alloy, which can be used at 850 ℃. In the study, the thermal deformation behavior of GH4975 extruded rod prepared by vacuum induction melting (VIM) and vacuum arc remelting (VAR) was studied by thermal simulation machine with the temperature range of 1070~1220 ℃ and strain rate range of 0.001~1 s^-1. The results show that the stress-strain curves of GH4975 alloy are divided into three stages: strain hardening, flow softening and steady state rheology, exhibiting typical dynamic recrystallization characteristics. The constitutive equation of GH4975 extruded rod was established and the hot deformation activation energy was calculated as 664587 J/mol. Besides, the processing maps of GH4975 alloy were drawn based on the dynamic material model (DMM), and the suitable processing parameters are determined by combining with microstructure observation. The dynamic recrystallization easily occurs at the deformation temperature range of 1100~1130 ℃, and the nucleation mechanisms were elaborated to be strain inducing grain boundary.

Key words： turbine disc wrought superalloy GH4975 extrusion hot deformation dynamic recrystallization

收稿日期: 2020-03-04

ZTFLH:

TG146.1

基金资助:预研基金项目(9140C4302XX)

作者简介: 张勇，男，1976年生，高级工程师，博士

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	梁红艳
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链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2020.00074 或 https://www.ams.org.cn/CN/Y2020/V56/I10/1401

图1 挤压后并再结晶处理的GH4975棒材微观组织(腐蚀态)

图2 GH4975合金在不同变形条件下的真应力-真应变曲线

图3 GH4975合金热变形过程中相关参数之间的关系

图4 应力测定值与采用Arrhenius模型的峰值应力预测值对比

图5 GH4975合金在终应变0.8下的热加工图及不同变形区域的微观组织验证(阴影部分表示不稳定区域)

图6 GH4975合金在0.1 s-1应变速率和不同温度下变形后的微观组织

图7 1130 ℃下不同应变速率对GH4975合金组织的影响

图8 GH4975合金在不同变形条件下微观组织的TEM像

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