晶粒细化对K417G高温合金蠕变性能的影响

doi:10.11900/0412.1961.2014.00245

金属学报

2014, Vol. 50

Issue (11): 1384-1392 DOI: 10.11900/0412.1961.2014.00245

本期目录 | 过刊浏览

晶粒细化对K417G高温合金蠕变性能的影响

都贝宁, 杨金侠, 崔传勇(

), 孙晓峰

中国科学院金属研究所, 沈阳 110016

EFFECTS OF GRAIN REFINEMENT ON CREEP PROPERTIES OF K417G SUPERALLOY

DU Beining, YANG Jinxia, CUI Chuanyong(

), SUN Xiaofeng

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

引用本文:

都贝宁, 杨金侠, 崔传勇, 孙晓峰. 晶粒细化对K417G高温合金蠕变性能的影响[J]. 金属学报, 2014, 50(11): 1384-1392.
Beining DU, Jinxia YANG, Chuanyong CUI, Xiaofeng SUN. EFFECTS OF GRAIN REFINEMENT ON CREEP PROPERTIES OF K417G SUPERALLOY[J]. Acta Metall Sin, 2014, 50(11): 1384-1392.

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摘要:

研究了晶粒细化对K417G高温合金在760 ℃/645 MPa, 900 ℃/315 MPa和950 ℃/235 MPa下的蠕变性能的影响. 结果表明, 晶粒细化对合金蠕变性能的影响与温度和施加应力有关. 在760 ℃/645 MPa下合金的蠕变性能随晶粒细化而提高, 变形以晶内变形为主; 900 ℃/315 MPa下的蠕变性能随晶粒细化先升高后降低, 变形为晶内变形和晶界滑移竞争作用; 950 ℃/235 MPa下的蠕变性能随晶粒细化而降低, 变形以晶界滑移为主. 760 ℃/645 MPa下, 位错切过g' 相, 基体通道中没有位错网产生; 900 ℃/315 MPa和950 ℃/235 MPa下位错通过Orowan机制绕过g' 相, 基体通道中产生位错网, 并且M₂₃C₆在晶内析出.

关键词 ：高温合金, 晶粒尺寸, 蠕变性能

Abstract：

Grain size is one of the most important parameters which affect the mechanical properties of cast polycrystalline superalloys. To study the effect of grain refinement on the creep behaviors of K417G superalloy, the creep behaviors of K417G superalloy with four grain sizes were investigated at 760 ℃/645 MPa, 900 ℃/315 MPa and 950 ℃/235 MPa. The longitudinal section of the fracture surface, crack propagation path, dislocation structure and plastic deformation distribution in the vicinity of the cracks were investigated by using SEM, TEM and EBSD techniques, thus the deformation mechanism and effect of grain refinement on the creep properties of K417G superalloy were determined under different creep conditions. The results showed that the effects of grain refinement on the creep property of the alloy varied with the temperatures and stress. At 760 ℃/645 MPa, grain refinement improved the creep life and reduced the steady-state deformation rate of the alloy. The creep deformation was dominated by intragranular deformation. At 900 ℃/315 MPa, as grain size decreased, the creep life increased firstly and then decreased, while the steady-state deformation rate decreased firstly and then increased. The creep deformation showed a competitive effect of intragranular deformation and grain boundary sliding. At 950 ℃/235 MPa, the creep life decreased and the steady-state deformation rate increased with the decrease of the grain size. Grain boundary sliding was the main deformation mode. At the same time, grain refinement could cause a refinement of the dendrite and carbide of the alloy, which would also affect the creep behavior of the alloy to a small extent. The TEM observation showed that at 760 ℃/645 MPa, the dislocations interacted with g' particles through shearing mechanism and no dislocation network was found in the matrix. While at 900 ℃/315 MPa and 950 ℃/235 MPa, the dislocations crossed the g' particles through Orowan bypass mechanism, dislocation network formed in the matrix, and M₂₃C₆ precipitated in the interior of the grains, which had a orientation relationship between the M₂₃C₆ precipitates and matrix .

Key words： superalloy grain size creep property

收稿日期: 2014-07-02

ZTFLH:

TG113.25

基金资助:*国家自然科学基金项目51171179, 51128101, 51271171和 11332010, 国家重点基础研究发展计划项目2010CB631206及中国科学院百人计划项目资助

作者简介: null

都贝宁, 女, 1989年生, 博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2014.00245 或 https://www.ams.org.cn/CN/Y2014/V50/I11/1384

表1 K417G合金的平均晶粒尺寸及碳化物和y' 相的平均尺寸

图1 K417G合金试棒晶粒分布与微观组织形貌

表2 A~D样品在不同条件下的蠕变寿命

图2 A~D样品在3种不同实验条件下的蠕变曲线

表3 4种晶粒尺寸的K417G合金在不同条件下的稳态变形速率K值

图3 蠕变实验后K417合金断口纵截面微观组织以及裂纹扩展路径

图4 样品D断口附近的EBSD面扫描形貌

图5 不同条件后K417G合金的位错组态及微观组织的TEM像

图6 晶内变形和晶界滑移示意图

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