Hot Deformation Characteristics of Ni-Based Superalloy GH710 with Hard Deformation
摘 要
利用热模拟试验机研究了GH710合金在变形温度为1 110~1 150 ℃,应变速率为0.01~1 s-1条件下的高温变形特性及变形后的组织特征。结果表明: 在1 150 ℃以下热变形时合金发生了亚固溶态的再结晶, 且γ'相在1 130 ℃时已部分回溶; 通过Arrhenius双曲正弦函数模型构建了合金的本构关系, 得到了合金热变形激活能为693.46 kJ·mol-1; 合金动态再结晶临界应变随着应变速率的增大及变形温度的降低而增加, 且临界应变和峰值应变之间满足εc=0.61εp; 合金热加工过程中的软化机制为动态再结晶, 根据热变形后的组织特征确定合金合理的热变形温度范围为1 110~1 130 ℃, 应变速率为0.01 s-1。
Abstract
The hot deformation and microstructure characteristics of GH710 alloy were investigated by thermal simulated test at the strain rates of 0.01-1 s-1 and temperatures of 1 110-1 150 ℃. The results show that metastable solid solution stare recrystallization occurred below 1 150 ℃, and γ'phase partly dissolved into the matrix at 1 130 ℃. A hyperbolic sine function of Arrhenius was used to describe the constitutive relation for GH710 alloy with good fit accuracy, giving the hot deformation activation energy of 693.46 kJ·mol-1. The critical strain of dynamic recrystalliztion, which met a linear relationship with peak strain as εc=0.61εp, increased with increasing the strain rate and decreasing the deformation temperature. The soften mechanism of GH710 alloy was dynamic recrystallization during hot working process. According to the microstructure after hot deformation, it was proposed for GH710 alloy that proper deformation temperature range was 1 110-1 130 ℃ and proper strain rate was 0.01 s-1.
中图分类号 TG146.1
所属栏目 材料性能及其应用
基金项目 航空科学基金资助项目(2010ZF74004)
收稿日期 2011/10/26
修改稿日期 2012/7/16
网络出版日期
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备注于秋颖(1984-),女,山东威海人, 博士研究生。
引用该论文: YU Qiu-ying,ZHANG Mai-cang,DONG Jian-xin,YAO Zhi-hao. Hot Deformation Characteristics of Ni-Based Superalloy GH710 with Hard Deformation[J]. Materials for mechancial engineering, 2012, 36(12): 62~66
于秋颖,张麦仓,董建新,姚志浩. 难变形镍基高温合金GH710的高温变形特性[J]. 机械工程材料, 2012, 36(12): 62~66
被引情况:
【1】姚志浩,董建新,张麦仓,陈昊,于秋颖, "铸态K480和DD407高温合金在长期时效过程中γ′相的稳定性",机械工程材料 39, 67-72(2015)
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参考文献
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【2】田世藩, 张国庆, 李周, 等.先进航空发动机涡轮盘合金及涡轮盘制造[J].航空材料学报,2003,23(增):233-238.
【3】王淑云, 李慧曲, 杨洪涛.等温锻造GH710合金组织与性能[J].锻压技术, 2007,32(4):29-32.
【4】GOTTSTEIN G, BRUNGER E, FROMMERT M, et al. Prediction of the critical conditions for dynamic recrystallization in metals[J].Zeitschrift fur Metallkunde,2003,94(5):628-635.
【5】POLIAK E I, JONAS J. Critical strain for dynamic recrystallization in variable strain rate hot deformation[J].ISIJ International, 2003,43(5):692-700.
【6】NAJAFIZADEH A, JONAS J J. Predicting the critical stress for initiation of dynamic recrystallization[J].ISIJ International,2006,46(11):1679-1684.
【7】SHEPPARD T, PARSON N C, ZAIDI M A. Dynamic Recrystallization in Al-7Mg[J].Metal Science,1983,17(10):481-491.
【8】李文斌, 潘清林, 梁文杰, 等.含Sc超高强Al-Zn-Cu-Sc-Zr合金的热压缩变形流变应力[J].中国有色金属学报,2008,18(5):777-782.
【9】SHI H, MCLARENA J, SELLARS C M, et al. Constitutive equations for high temperature flow stress of alununum alloys[J].Materials Science and Technology,1997,13:210-216.
【10】SUBRAMANIAN S V, ZHU G, KLINKENBERG C. Ultra-fine grain size by dynamic recrystallization in strip rolling of Nb microalloyed steel[J].Materials Science Forum,2005,475/479:141-144.
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