镍基高温合金定向凝固过程中的汇聚型双晶竞争生长<sup>*</sup>

doi:10.11900/0412.1961.2015.00631

金属学报

2016, Vol. 52

Issue (8): 897-904 DOI: 10.11900/0412.1961.2015.00631

论文

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镍基高温合金定向凝固过程中的汇聚型双晶竞争生长^*

胡松松,刘林(

),崔强伟,黄太文,张军,傅恒志

西北工业大学凝固技术国家重点实验室, 西安 710072

CONVERGING COMPETITIVE GROWTH IN BI-CRYSTAL OF Ni-BASED SUPERALLOY DURINGDIRECTIONAL SOLIDIFICATION

Songsong HU,Lin LIU(

),Qiangwei CUI,Taiwen HUANG,Jun ZHANG,Hengzhi FU

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China

引用本文:

胡松松,刘林,崔强伟,黄太文,张军,傅恒志. 镍基高温合金定向凝固过程中的汇聚型双晶竞争生长^*[J]. 金属学报, 2016, 52(8): 897-904.
Songsong HU, Lin LIU, Qiangwei CUI, Taiwen HUANG, Jun ZHANG, Hengzhi FU. CONVERGING COMPETITIVE GROWTH IN BI-CRYSTAL OF Ni-BASED SUPERALLOY DURINGDIRECTIONAL SOLIDIFICATION[J]. Acta Metall Sin, 2016, 52(8): 897-904.

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摘要:

采用籽晶法控制晶体取向, 研究了不同抽拉速率下镍基高温合金汇聚型双晶的竞争生长. 结果表明, 低抽拉速率下, 非择优枝晶能够穿插进入择优枝晶间的液相通道, 抑制择优枝晶的生长, 使晶界向择优晶粒方向偏移. 高抽拉速率下, 非择优枝晶几乎全部被晶界择优枝晶阻挡, 晶界与择优枝晶干平行. 非择优枝晶进入择优枝晶间的液相通道使择优枝晶萎缩消失是非择优晶粒淘汰择优晶粒的主要因素, 并以此提出了抽拉速率对竞争生长的影响机制.

关键词 ：镍基高温合金, 竞争生长, 抽拉速率

Abstract：

Ni-based single crystal superalloy has been widely used in turbine blades due to its excellent high temperature mechanical behavior. In order to completely exhibit high temperature mechanical properties, the seed method has been used to produce Ni-based single crystal components for [001] orientation paralleling to main force direction. Stray crystals, which unexpectedly nucleate in the melt-back region, will competitively grow with seed during directional solidification. It is important to profoundly understand the mechanism of competitive growth to find ways of overgrowing stray crystal during producing Ni-based single crystal components. However, within the published research there are conflicting views on the mechanism of competitive growth at converging case. Bi-crystal converging competitive growth was investigated in Ni-based single crystal superalloy with different pulling rates using seed technology. A series of polishing and imaging quenching interface were done for the positional relationship of dendrites near grain boundary in 3D reference. It was found that solidification microstruc tures were different with different crystal orientations. Unfavorable oriented dendrite tilting to heat flux restrained favorable oriented dendrite aligning to heat flux mainly thought inserting into the favorable oriented dendrites channel, and this resulted in unfavorable oriented dendrite overgrowing favorable oriented dendrite at low pulling rate. However, at high pulling rate the unfavorable oriented dendrites mainly blocked by grain boundary favorable oriented dendrite and the grain boundary grew paralleling to favorable oriented dendrite core. Favorable oriented dendrite being depressed and vanished, owning to that unfavorable oriented dendrite inserting into favorable oriented dendrites channel result in adjusting primary dendrite spacing, is the main factor to favorable oriented grain overgrew by unfavorable oriented grain. According to above mechanism, effect of pulling rate on competitive growth at converging case was interpreted. This could broaden our understanding of competitive growth at converging case in 3D reference.

Key words： Ni-based superalloy competitive growth pulling rate

收稿日期: 2015-12-07

基金资助:* 国家自然科学基金项目51331005, 51171151和51501151, 国家高技术研究发展计划项目2012AA03A511, 国家重点基础研究发展计划项目2011CB610406, 陕西省自然科学基金项目2014JM6227, 西北工业大学基础研究基金项目3102014JCQ01022及先进航空发动机协同创新中心项目资助

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https://www.ams.org.cn/CN/10.11900/0412.1961.2015.00631 或 https://www.ams.org.cn/CN/Y2016/V52/I8/897

图1 双籽晶放置示意图

图2 抽拉速率为50 μm/s时不同取向镍基单晶高温合金横截面和纵截面的OM像

图3 抽拉速率对枝晶间距的影响

图4 不同凝固距离和抽拉速率下镍基双晶高温合金凝固组织横截面的OM像

图5 抽拉速率为50 μm/s时层磨法获得的镍基高温合金淬火界面OM像

图6 抽拉速率为100 μm/s时层磨法获得的镍基高温合金淬火界面OM像

图7 抽拉速率对竞争生长的影响

图8 晶界枝晶位置关系示意图

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