高钨K416B铸造镍基合金高温蠕变期间碳化物演化行为

doi:10.11900/0412.1961.2014.00543

金属学报

2015, Vol. 51

Issue (4): 458-464 DOI: 10.11900/0412.1961.2014.00543

本期目录 | 过刊浏览

高钨K416B铸造镍基合金高温蠕变期间碳化物演化行为

谢君(

), 于金江, 孙晓峰, 金涛, 孙元

中国科学院金属研究所, 沈阳 110016

CARBIDE EVOLUTION BEHAVIOR OF K416B AS-CAST Ni-BASED SUPERALLOY WITH HIGH W CONTENT DURING HIGH TEMPERATURE CREEP

XIE Jun(

), YU Jinjiang, SUN Xiaofeng, JIN Tao, SUN Yuan

Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

引用本文:

谢君, 于金江, 孙晓峰, 金涛, 孙元. 高钨K416B铸造镍基合金高温蠕变期间碳化物演化行为[J]. 金属学报, 2015, 51(4): 458-464.
Jun XIE, Jinjiang YU, Xiaofeng SUN, Tao JIN, Yuan SUN. CARBIDE EVOLUTION BEHAVIOR OF K416B AS-CAST Ni-BASED SUPERALLOY WITH HIGH W CONTENT DURING HIGH TEMPERATURE CREEP[J]. Acta Metall Sin, 2015, 51(4): 458-464.

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摘要:

通过蠕变性能测试和组织形貌观察, 研究了高钨K416B镍基合金高温蠕变期间析出相的演化行为. 结果表明, 铸态合金中g'相的尺寸不均匀, 条状MC碳化物在枝晶间区域呈汉字型分布; 在施加应力的高温蠕变期间, 细小M₆C碳化物可在形变基体中不连续析出, 热力学分析认为: 在应力诱导作用下, 元素C偏聚在应力集中处, 与W等碳化物形成元素结合, 促使细小M₆C相自基体中析出; 同时, 条状MC碳化物表面形成沟槽, 并逐渐分解蜕变成粒状M₆C相, 其中, 在条状MC相表面形成的附加应力是促使MC相不断溶解和发生球化的主要原因.

关键词 ： K416B镍基合金, 蠕变, 碳化物演化, 热力学分析

Abstract：

As-cast Ni-based superalloys with high W content are used extensively in the turbine vane of aero-engine due to their good heat resistance and temperature capability. During high temperature service, the creep deformations and microstructure evolution are occurred in the using materials, and the creep behavior mainly depends on their chemical composition and microstructure, such as size, distribution and morphology of g' phase and carbides. Thereinto, the mophologies of carbide phases are closely related to creep resistance of the alloy. Generally, the carbide particles displaying dispersive distribution may enhance the creep resistance of the alloy, while the carbide with continuous morphologies distributed in the boundaries, they may provide easy paths for crack propagation and degrade the mechanical properties of the alloy. Besides the creep life of the alloy also depends on the microstructure evolution under high temperature. But the evolution mechanism of carbides in K416B superalloy during creep is still unclear up to now. For this reason, by means of creep property measurement and microstructure observation, the evolution behavior of precipitates in K416B Ni-based superalloy with high W content during high temperature creep has been investigated. The results show that the size of g' phase is inhomogeneous in the as-cast alloy, and the stripe MC-carbide distribute in the inter-dendrite regions displaying Chinese structures. During high temperature creep applied stress, fine M₆C carbide discontinuously precipitate in the deformed g matrix. The thermodynamics analysis indicates that the carbon element segregates in the regions of stress concentration and combines with carbide-forming elements W etc, which promoted the fine M₆C carbide to precipitate from the g matrix. At the same time, the grooves are formed on the surface of stripe MC carbide, and then gradually decomposed and transformed into M₆C particles. Thereinto, the additional press formed in the surface of stripe MC carbide is the main factor to promote the MC phase continuous dissolution and spheroidizing.

Key words： K416B Ni-based superalloy creep carbide evolution thermodynamics analysis

ZTFLH:

TG132.3

基金资助:* 国家重点基础研究发展计划项目2010CB631200和2010CB631206, 以及国家自然科学基金项目50931004资助

作者简介: null

谢君, 男, 1986年生, 博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2014.00543 或 https://www.ams.org.cn/CN/Y2015/V51/I4/458

图1 K416B合金在1000 ℃施加150 MPa应力下的蠕变曲线

图2 铸态K416B合金的SEM像

图3 在1000 ℃施加150 MPa应力下, K416B合金蠕变不同时间后的SEM像

图4 在1000 ℃施加150 MPa应力下, K416B合金中的长条碳化物蠕变不同时间的SEM像

图5 在1000 ℃施加150 MPa应力下, K416B合金中的长条状碳化物蠕变不同时间的TEM像

图6 蠕变断裂K416B合金的TEM像

图7 蠕变期间条状MC相熔断示意图

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