Hf对第二代镍基单晶高温合金DD11高温低应力持久性能的影响

doi:10.11900/0412.1961.2015.00363

金属学报

2015, Vol. 51

Issue (10): 1261-1272 DOI: 10.11900/0412.1961.2015.00363

本期目录 | 过刊浏览

Hf对第二代镍基单晶高温合金DD11高温低应力持久性能的影响

赵云松^1,²,张剑²,骆宇时²,唐定中²,冯强^1,³(

)

2 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
3 高端金属材料特种熔炼工艺与制备北京市重点实验室, 北京 100083

EFFECTS OF Hf ON HIGH TEMPERATURE LOW STRESS RUPTURE PROPERTIES OF A SECOND GENERATION Ni-BASED SINGLE CRYSTAL SUPERALLOY DD11

Yunsong ZHAO^1,²,Jian ZHANG²,Yushi LUO²,Dingzhong TANG²,Qiang FENG^1,³(

)

1 State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083
2 Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095
3 Beijing Key Laboratory of Special Melting and Reparation of High-end Metal Materials, Beijing 100083

引用本文:

赵云松,张剑,骆宇时,唐定中,冯强. Hf对第二代镍基单晶高温合金DD11高温低应力持久性能的影响[J]. 金属学报, 2015, 51(10): 1261-1272.
Yunsong ZHAO, Jian ZHANG, Yushi LUO, Dingzhong TANG, Qiang FENG. EFFECTS OF Hf ON HIGH TEMPERATURE LOW STRESS RUPTURE PROPERTIES OF A SECOND GENERATION Ni-BASED SINGLE CRYSTAL SUPERALLOY DD11[J]. Acta Metall Sin, 2015, 51(10): 1261-1272.

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摘要:

通过对4种不同Hf含量(0~0.80%, 质量分数, 下同)的第二代镍基单晶高温合金DD11铸态及热处理态组织定量表征与1100 ℃, 140 MPa持久性能测试, 研究了Hf对相转变温度、(γ+γ’)共晶组织、碳化物、微孔、凝固偏析、合金元素成分分配比及持久性能的影响. 结果表明, 添加Hf显著降低合金的固/液相线, 降低微孔含量, 提高铸态共晶组织体积分数、MC型碳化物含量以及凝固偏析程度. 合金热处理后, 随着Hf含量提高, 固溶微孔含量显著降低、残余共晶和碳化物含量显著增加. 添加Hf通过提高Re, Mo和Cr的成分分配比, 增加γ/γ’错配度, 减小γ/γ’界面位错间距, 促进Re, Mo和Cr向γ相中偏聚, 提高固溶强化效果, 减小微孔含量等方式, 显著提高DD11合金持久性能. 但当Hf含量达到0.80%时, 热处理后的残余共晶、碳化物含量较高, 导致合金持久性能明显降低.

关键词 ：单晶高温合金, Hf, 成分分配比, 显微组织, 持久性能

Abstract：

The effect of Hf on the as-cast, heat-treated microstructures and stress rupture properties under 1100 ℃ and 140 MPa was investigated in four second generation Ni-based single crystal superalloys DD11 with various levels of Hf (0~0.80%, mass fraction) additions. The results indicate that increasing Hf addition resulted in decreasing the solidus and liquidus temperatures, while it enhanced the volume fraction of (γ+γ’) eutectic and MC carbide as well as solidification segregation. The number of micropores reduced significantly and the volume fraction of residual (γ+γ’) eutectic and MC carbide increased after heat treatment as Hf content increased. Compared to the Hf-free alloy, the stress rupture life was observed to increase in the alloys with 0.40%Hf, but dropped in the alloy containing 0.80%Hf. Hf addition increased the elemental partitioning ratio of Re, Mo, Cr, resulting in increasing γ/γ’ misfit and decreasing the spacing of γ/γ’ interfacial dislocation networks. The solution strengthing effect was also improved with the enhanced concentration of Re, Mo and Cr in γ phase in Hf-modified alloys. However, when the Hf content was 0.80% in DD11 alloy, the stress rupture properties was decreased obviously due to high volume fraction of residual (γ+γ’) eutectic and MC carbide in heat-treated microstructures.

Key words： single crystal superalloy Hf elemental partitioning ratio micrstructure stress rupture property

基金资助:* 国家高技术研究发展计划项目2012AA03A513和2012AA03A511, 国家重点基础研究发展计划项目2010CB631201和教育部技术支撑重点项目625010337资助

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图1 4种铸态合金的OM像

图2 铸态合金Hf-3和Hf-4共晶区域的BSE-SEM像

表1 铸态合金显微组织表征

图3 铸态合金中各元素的凝固偏析系数

图4 4种铸态合金的DSC升温曲线

图5 合金Hf-4经1320 ℃热处理6 h空冷后的初熔组织

图6 合金Hf-1和Hf-4完全热处理后枝晶干处的典型组织

表2 完全热处理态合金枝晶干处的γ’相尺寸、体积分数及γ通道宽度

图7 合金Hf-1, Hf-3和Hf-4完全热处理后的OM像

图8 合金Hf-1, Hf-3和Hf-4完全热处理后未侵蚀的OM像

表3 完全热处理态合金的枝晶间残余共晶、碳化物及微孔体积分数

图9 完全热处理态合金中各元素在γ/γ’两相中的成分分配比

图10 合金在1100 ℃, 140 MPa持久断裂后γ/γ’界面位错网络

图11 1100 ℃, 140 MPa持久条件下合金平均位错间距与平均持久寿命的关系

图12 合金Hf-1 和Hf-4 在1100 ℃, 140 MPa持久断裂后的近断口处纵剖面组织

图13 MC碳化物阻碍固溶扩散通道示意图

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