第三代单晶高温合金DD33固溶处理中组织的演变<sup>*</sup>

doi:10.11901/1005.3093.2013.848

材料研究学报

2014, Vol. 28

Issue (6): 407-412 DOI: 10.11901/1005.3093.2013.848

本期目录 | 过刊浏览

第三代单晶高温合金DD33固溶处理中组织的演变^*

刘心刚¹(

),雷强²,王莉¹,李相伟¹,钱宝³,楼琅洪¹

1. 中国科学院金属研究所高温合金研究部沈阳 110016
2. 贵州黎阳航空动力有限公司贵州 561102
3. 锦州航星真空设备有限公司锦州 121001

Microstructural Evolution of a Third-Generation Single Crystal Superalloy DD33 During Solution Treatment

Xingang LIU^1,^**(

),Qiang LEI²,Li WANG¹,Xiangwei LI¹,Bao QIAN³,Langhong LOU¹

1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
2. Guizhou Liyang Aviation Power Co., Ltd., Guizhou 561102
3. Jinzhou Hangxing Vacuum Equipment Co., Ltd., Jinzhou 121001

引用本文:

刘心刚,雷强,王莉,李相伟,钱宝,楼琅洪. 第三代单晶高温合金DD33固溶处理中组织的演变^*[J]. 材料研究学报, 2014, 28(6): 407-412.
Xingang LIU, Qiang LEI, Li WANG, Xiangwei LI, Bao QIAN, Langhong LOU. Microstructural Evolution of a Third-Generation Single Crystal Superalloy DD33 During Solution Treatment[J]. Chinese Journal of Materials Research, 2014, 28(6): 407-412.

全文: PDF(10715 KB) HTML

摘要:

通过金相显微镜(OM)、扫描电镜(SEM)和电子探针(EPMA)等手段研究了第三代单晶高温合金DD33在固溶处理过程中组织的演变。结果表明: 在第三代单晶高温合金DD33中, 枝晶间γ'相在1310℃保温时明显长大, 而在1320℃/2 h固溶后完全溶解; (g+γ')共晶在高于1320℃时显著溶解; MC碳化物在固溶处理过程中发生溶解, 由草书体状向颗粒状转变, 促进枝晶间γ'相的长大; 随着固溶温度的提高共晶γ'相中Al、Ta、Cr、Co等元素的偏析加剧, 这一现象可能是上坡扩散引起的。

关键词 ：金属材料, 单晶高温合金, 固溶处理, 微观组织, 共晶

Abstract：

The microstructural evolution of a third-generation single crystal superalloy DD33 during solution treatment has been investigated by optical microscope (OM), Scanning electron microscope (SEM) and electron probe microanalysis (EPMA). The results show that the γ' particles in interdendritic regions of the alloy grew up obviously during isothermal exposure at 1310℃, and fully dissolved after heat treated at 1310℃/2 h. No significant dissolution of (g +γ') eutectic could be observed when solution treated at temperatures below 1320℃. The cursive -script like MC carbides dissolved gradually and then transform into granular MC particles during solution treatment, which promoted the coarsening of γ' precipitates in the interdendritic regions. The segregation of elements Al, Ta, Cr and Co in the eutectic γ' was enhanced with the increasing temperature, which may be induced by up-hill diffusion.

Key words： metallic materials single crystal superalloy solution treatment microstructure eutectic

收稿日期: 2013-11-12

基金资助:* 国家自然基金51201164, 国家高技术发展2012AA03A511、2012AA03A513和国家基础研究2010CB631201资助项目。

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https://www.cjmr.org/CN/10.11901/1005.3093.2013.848 或 https://www.cjmr.org/CN/Y2014/V28/I6/407

图1 合金的固溶处理工艺

图2 铸态合金的枝晶组织及析出相

图3 合金在1240℃/2 h和1260℃/2 h固溶后的显微组织

图4 合金在1280～1340℃各温度段固溶后的显微组织

图5 固溶处理过程中MC碳化物形貌的变化

图6 分级固溶处理不同阶段MC碳化物体积分数的变化曲线

图7 共晶γ'相中各合金元素含量随温度的变化曲线

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