CM247LC单晶高温合金中MC碳化物对γ/γ′共晶反应的影响

doi:10.11900/0412.1961.2017.00110

金属学报

2017, Vol. 53

Issue (12): 1603-1610 DOI: 10.11900/0412.1961.2017.00110

本期目录 | 过刊浏览

CM247LC单晶高温合金中MC碳化物对γ/γ′共晶反应的影响

马德新¹, 王富², 温序晖³, 孙德建⁴, 刘林⁴(

)

1 深圳万泽中南研究院深圳 518045
2 Foundry Institute, RWTH Aachen University, Aachen 52072, Germany
3 东方电气集团中央研究院能量转换技术研发中心成都 611731
4 西北工业大学凝固技术国家重点实验室西安 710072

Influence of MC Carbides on the Formation of γ/γ′ Eutectics in Single Crystal Superalloy CM247LC

Dexin MA¹, Fu WANG², Xuhui WEN³, Dejian SUN⁴, Lin LIU⁴(

)

1 Wedge Central South Research Institute, Shenzhen 518045, China
2 Foundry Institute, RWTH Aachen University, Aachen 52072, Germany
3 Energy Conversion R&D Center, Central Academy, Dongfang Electric Co., Chengdu 611731, China
4 State Key Laborotory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China

引用本文:

马德新, 王富, 温序晖, 孙德建, 刘林. CM247LC单晶高温合金中MC碳化物对γ/γ′共晶反应的影响[J]. 金属学报, 2017, 53(12): 1603-1610.
Dexin MA, Fu WANG, Xuhui WEN, Dejian SUN, Lin LIU. Influence of MC Carbides on the Formation of γ/γ′ Eutectics in Single Crystal Superalloy CM247LC[J]. Acta Metall Sin, 2017, 53(12): 1603-1610.

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摘要:

在0.2 mm/min的抽拉速率下对高温合金CM247LC进行了单晶定向凝固实验,观察分析了水淬的糊状区内的组织。结果显示,合金凝固时首先形成γ枝晶,然后初生MC碳化物在γ枝晶尖端稍后的位置开始形成,γ/γ′共晶在凝固最后阶段析出。值得注意的是,γ/γ′共晶反应是以化学成分和晶体结构都完全不同的MC碳化物作为异质形核核心,而不是依附在形核条件更好的γ相上。检测结果表明,在MC碳化物基底上形成的γ/γ′共晶体具有杂乱的晶体取向,与单晶γ相基体的取向完全不同,说明宏观上为单晶体的高温合金铸件实际上可能含有许多微小杂晶晶粒,使得铸件的单晶性受到影响。

关键词 ：高温合金, 单晶, 定向凝固, MC碳化物, γ/γ′共晶

Abstract：

The structure formation of superalloys is very complicated because of their multicomponent composition and multiphase transition processing. Duo to the limitation of some pre-conditions, the structure formation can not be accurately determined by thermodynamic calculation method. Knowledge about the structure is critical for the design of the following heat treatment process. In this work, a single crystal (SC) sample of superalloy CM247LC was directional solidified in a labor Bridgman furnace with a pulling rate of 0.2 mm/min and then water quenched, to investigate the solidification sequence including MC carbide and γ/γ′-eutectic. It was observed that the γ-phase is firstly formed in the form of dendrites; it is then followed by the homogeneously precipitation of MC carbides from the liquid behind dendrite tips. Near the end of solidification the interdendritic residual liquid transits into γ/γ′-eutectics. It is interesting to found that the γ/γ′ eutectics do not nucleate on the existing γ -phase, but preferably on the MC carbides which have completely different chemical composition and crystal structure. The result of EBSD examination indicates that the γ/γ′ eutectics formed on the MC substrates have random crystal orientations compared to the SC γ -matrix, exhibiting the misoriented multi-crystal microstructure in the so called "single crystal" superalloy casting.

Key words： superalloy single crystal directional solidification MC carbide γ/γ′ eutectic

收稿日期: 2017-04-05

ZTFLH:

TG21

基金资助:国家自然科学基金项目Nos.51331005、51690163和51631008,国家重点研发计划项目 No.2016YFB0701405,深圳市科技创新委员会项目No.JSGG20150731142227736

作者简介:

作者简介马德新,男,1955年生,教授

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链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2017.00110 或 https://www.ams.org.cn/CN/Y2017/V53/I12/1603

图1 水淬试棒上部的纵截面和糊状区不同深度的横截面

图2 糊状区中不同深度横截面的MC碳化物形貌

图3 水淬糊状区中γ /γ'共晶以MC碳化物为基底的形核和长大过程

Element	Average	$C 0 i$	kⁱ= $C MC i / C 0 i$	MC element
C	3.38	0.09	37.56	Yes
Al	0.12	5.49	0.02	No
Ti	7.17	0.74	9.69	Yes
Cr	0.33	8.03	0.04	No
Mo	0.63	0.50	1.26	N.D.
Co	0.28	9.41	0.03	No
W	6.43	9.87	0.65	N.D.
Ta	58.60	2.90	20.20	Yes
Hf	21.10	1.36	15.52	Yes
Ni	1.95	61.61	0.03	No

表1 初生MC碳化物中各元素i的平均含量(CMCi)及与母合金相应成分(C0i)的比值ki

图4 水淬糊状区横截面的OM像和EBSD取向成像图

图5 水淬糊状区横截面的SEM像和EBSD取向成像图

图6 糊状区内凝固过程示意图

图7 CM247LC铸件的铸态组织

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