鎳基高溫合金定向凝固過(guò)程中的匯聚型雙晶競(jìng)爭(zhēng)生長(zhǎng)
發(fā)布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時(shí)間：2016-05-10
采用籽晶法控制晶體取向, 研究了不同抽拉速率下鎳基高溫合金匯聚型雙晶的競(jìng)爭(zhēng)生長(zhǎng).
鎳基高溫合金定向凝固過(guò)程中的匯聚型雙晶競(jìng)爭(zhēng)生長(zhǎng)CONVERGING COMPETITIVE GROWTH IN BI-CRYSTAL OF?Ni-BASED SUPERALLOY DURING DIRECTIONAL?SOLIDIFICATION采用籽晶法控制晶體取向, 研究了不同抽拉速率下鎳基高溫合金匯聚型雙晶的競(jìng)爭(zhēng)生長(zhǎng). 結(jié)果表明, 低抽拉速率下, 非擇優(yōu)枝晶能夠穿插進(jìn)入擇優(yōu)枝晶間的液相通道, 抑制擇優(yōu)枝晶的生長(zhǎng), 使晶界向擇優(yōu)晶粒方向偏移. 高抽拉速率下, 非擇優(yōu)枝晶幾乎全部被晶界擇優(yōu)枝晶阻擋, 晶界與擇優(yōu)枝晶干平行. 非擇優(yōu)枝晶進(jìn)入擇優(yōu)枝晶間的液相通道使擇優(yōu)枝晶萎縮消失是非擇優(yōu)晶粒淘汰擇優(yōu)晶粒的主要因素, 并以此提出了抽拉速率對(duì)競(jìng)爭(zhēng)生長(zhǎng)的影響機(jī)制.?
Ni-based single crystal superalloy has been widely used in turbine blades owing to its excellent high?temperature mechanical behavior. In order to completely exhibitits 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 competitive grow?with seed during directional solidification. It is important to profoundly understand the mechanism of competitive?growth for finding ways to overgrow 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. Using seed technology, bi-crystal converging competitive growth was investigated with different pulling?rates. 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 microstructures were different with different?crystal orientations. Unfavorable orientated dendrite tilting to heat flux restrained favorable orientated dendrite?aligning to heat flux mainly thought inserting into the favorable orientated dendrites channel, and this resulted in?unfavorable orientated dendrite growth over growing favorable orientated dendrite at low pulling rate. However,?at high pulling rate the unfavorable dendrites mainly blocked by grain boundary favorable dendrite and the grain?boundary grew paralleling to favorable orientated dendrite core. Favorable orientated dendrite depressing and?vanishing, owning to that unfavorable orientated dendrite inserting into favorable orientated dendrites channel?result in adjusting primary dendrite spacing, is the main factor to favorable orientated grain overgrew by?unfavorable orientated 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.?
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