HRS和LMC工艺对第三代镍基单晶高温合金DD33中显微孔洞的影响*

doi:10.11901/1005.3093.2014.172

材料研究学报

2014, Vol. 28

Issue (9): 656-662 DOI: 10.11901/1005.3093.2014.172

本期目录 | 过刊浏览

HRS和LMC工艺对第三代镍基单晶高温合金DD33中显微孔洞的影响*

李相伟¹,王莉¹(

),刘心刚¹,王苏程²,楼琅洪¹

1. 中国科学院金属研究所高温合金部沈阳 110016
2. 中国科学院金属研究所沈阳材料科学国家(联合)实验室沈阳 110016

Microporosity Reduction By Liquid Cooling Process of A Single Crystal Nickel Based Superalloy

Xiangwei LI¹,Li WANG^1,^**(

),Xingang LIU¹,Sucheng WANG²,Langhong LOU¹

1. Superalloys Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

引用本文:

李相伟,王莉,刘心刚,王苏程,楼琅洪. HRS和LMC工艺对第三代镍基单晶高温合金DD33中显微孔洞的影响*[J]. 材料研究学报, 2014, 28(9): 656-662.
Xiangwei LI, Li WANG, Xingang LIU, Sucheng WANG, Langhong LOU. Microporosity Reduction By Liquid Cooling Process of A Single Crystal Nickel Based Superalloy[J]. Chinese Journal of Materials Research, 2014, 28(9): 656-662.

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摘要:

采用高分辨透射X射线三维成像技术研究了传统高速凝固法(HRS)和液态金属冷却法(LMC)两种工艺制备的镍基单晶高温合金DD33中显微孔洞的三维尺寸信息, 结果表明: 与HRS相比, LMC工艺降低一次枝晶间距, 增加共晶体积分数, 使最后凝固阶段枝晶间的空隙尺寸变大, 压降降低, 最终降低了铸态孔的尺寸及体积分数。固溶处理后用两种工艺制备的合金中显微孔洞的体积分数都有所增加, 但是用LMC工艺制备的合金中较细的枝晶和较低的偏析程度, 使合金中固溶孔的体积分数显著低于用HRS工艺制备的合金。

关键词 ：金属材料, 单晶高温合金, 显微孔洞, LMC, 高分辨透射X射线三维成像技术

Abstract：

Microporosity in a single crystal nickel-based superalloy DD33 solidified by high rate solidification (HRS) and liquid metal cooling (LMC) process was investigated by the X-ray tomography (XRT). It is found that the pressure drop was reduced because of the larger volume fraction of eutectic in the alloy solidified by LMC, which results in less solidification-pore (S-pore) formation. Homogenization-pore (H-pore) forms in interdendritic regions during solution heat treatment, which results in the increase of volume fraction of porosities during heat treatment. However, lower level of H-pore in the LMC samples can be attributed to the finer dendrite arm spacing and the lower segregation.

Key words： metallic materials single crystal superalloy microporosity LMC XRT

收稿日期: 2014-04-08

基金资助:* 国家重点基础研究发展计划项目2010CB631201, 国家自然科学基金51201164和国家高技术研究发展计划项目2012AA03A511。

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https://www.cjmr.org/CN/10.11901/1005.3093.2014.172 或 https://www.cjmr.org/CN/Y2014/V28/I9/656

表1 实验合金DD33的名义成分

图1 枝晶偏析测量选取的枝晶干和枝晶间测试点位置示意图

图2 XRT获得的用HRS工艺制备的铸态样品的典型三维组织形貌

图3 不同凝固工艺铸态组织形貌

图4 HRS和LMC制备的合金的一次枝晶间距和共晶体积分数对比

图5 HRS和LMC制备的合金中元素的枝晶偏析

图6 铸态组织中孔洞的形貌

图7 不同工艺制备的铸态合金中孔洞的孔径分布

图8 HRS工艺凝固的合金经过1330℃/10 h固溶处理后的显微组织形貌

图9 不同凝固工艺制备的合金固溶处理前后显微孔洞的体积分数对比

图10 不同凝固工艺的合金固溶处理后孔的孔径分布

图11 泊肃叶定律示意图

图12 固溶孔形成原理

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