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材料研究学报  2017, Vol. 31 Issue (7): 517-525    DOI: 10.11901/1005.3093.2016.377
  研究论文 本期目录 | 过刊浏览 |
固溶温度对GH2787合金组织性能的影响
徐玲1,2(), 国振兴3, 张冬梅3, 孙长青1, 朱爽1, 王炳达1, 李玉秀1, 崔传勇2
1 沈阳工程学院 沈阳 110136
2 中国科学院金属研究所 沈阳 110016
3 沈阳黎明航空发动机(集团)有限责任公司 沈阳 110043
Effect of Solution Temperature on Microstructure and Mechanical Property of High Temperature Alloy GH2787
Ling XU1,2(), Zhenxing GUO3, Dongmei ZHANG3, Changqing SUN1, Shuang ZHU1, Bingda WANG1, Yuxiu LI1, Chuanyong CUI2
1 Shenyang Institute of Engineering, Shenyang 110136, China
2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3 Shenyang Liming Aero-Engine Group Corporation, Shenyang 110043, China
引用本文:

徐玲, 国振兴, 张冬梅, 孙长青, 朱爽, 王炳达, 李玉秀, 崔传勇. 固溶温度对GH2787合金组织性能的影响[J]. 材料研究学报, 2017, 31(7): 517-525.
Ling XU, Zhenxing GUO, Dongmei ZHANG, Changqing SUN, Shuang ZHU, Bingda WANG, Yuxiu LI, Chuanyong CUI. Effect of Solution Temperature on Microstructure and Mechanical Property of High Temperature Alloy GH2787[J]. Chinese Journal of Materials Research, 2017, 31(7): 517-525.

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摘要: 

研究了不同固溶温度对GH2787合金组织和性能的影响。结果表明,当固溶温度高于γ'相溶解温度时,合金晶粒尺寸较大,γ'相体积分数较低;当固溶温度接近γ'相溶解温度时,合金中γ'相分布不均匀,并且出现γ'相团簇,同时在合金中析出大量η相;当固溶温度低于γ'相溶解温度时,合金晶粒尺寸较小,γ'相体积分数较高且均匀分布在合金中。显微硬度和拉伸试验表明,随固溶温度较低,合金的硬度和强度提高,研究表明GH2787合金的主要强化机理是晶界强化和沉淀强化。

关键词 金属材料GH2787热处理显微组织拉伸性能    
Abstract

Effect of solution treatment temperatures on the microstructure and mechanical property of a high temperature alloy GH2787 was investigated. The results showed that the grain size of the alloy could be controlled by the solution temperature. When the solution temperature was higher than the solve temperature of γ' phase, the grain size was larger and the volume fraction of γ'- phase was low. When the solution temperature was lower than the solve temperature of γ'-phase, the grain size was smaller and the volume fraction of γ'-phase was high, and which was uniformly distributed in the alloy. η-phase precipitated when the solution temperature was around the solve temperature of γ'-phase. The Vickers hardness and the tension strength increased as the solution temperature decreased. The strengthening mechanisms of the alloy GH2787 might be ascribed to grain boundary strengthening and precipitation strengthening.

Key wordsmetallic materials    GH2787    heat-treatment    microstructure    tension properties
收稿日期: 2016-07-04     
ZTFLH:  TG171  
基金资助:资助项目 国家重点基础研究发展计划(2010CB631206),国家自然科学基金(51171179, 51128101, 51271174)和中国科学院“百人计划”
作者简介:

作者简介 徐 玲,女,1983年生,博士,讲师

图1  采用Thermal-Calc计算的GH2787的相图
Elements C Cr Ni W Mo Al Ti B Mn Si P S Fe
0.07 15.05 34.9 3.17 <0.6 1.1 3.0 0.015 <0.05 0.06 0.003 <0.002 Bal.
表1  GH2787合金的化学成分
图2  压扁变形50%后样品的显微组织
图3  压扁变形后的显微组织
图4  γ’相溶解温度以上固溶处理后样品的金相组织
图5  980℃固溶处理后样品的组织形貌
图6  接近γ’相溶解温度固溶处理后样品的组织 (a) 940℃, (b) 920℃
图7  940℃固溶处理后样品的组织形貌
图8  γ’相溶解温度以下固溶处理后合金的组织
图9  900℃固溶处理后合金的显微组织
图10  针状析出相TEM形貌
图11  析出相衍射斑点
GH2787 Ni Cr W Ti Al Fe
Precipitation 57.24 7.85 - 12.50 1.31 21.09
Matrix 31.60 18.04 2.29 2.34 0.94 44.78
表2  析出相的化学成分
图12  样品的显微硬度随固溶温度变化的曲线
图13  不同温度热处理后合金在25℃及550℃下的拉伸性能曲线
Solution temperature/℃ Tension temperature /℃ σ0.2
/MPa
σb
/MPa
δ
/%
900 25 680 1037 31.5
550 615 915 26.5
750 635 665 43.5
940 25 586 1068 36.5
550 530 896 32.5
750 580 600 19.5
980 25 526 984 46.5
550 465 790 36.5
表3  热处理后合金在不同温度下的拉伸性能数据
图14  900℃固溶处理后室温拉伸变形的TEM显微组织
图15  940℃固溶处理后室温拉伸变形的TEM像
图16  980℃固溶处理后室温拉伸变形组织的TEM像
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