元素V对镍基柱状晶合金显微组织和高温蠕变性能的影响

doi:10.11901/1005.3093.2016.101

材料研究学报

2016, Vol. 30

Issue (6): 465-472 DOI: 10.11901/1005.3093.2016.101

研究论文

本期目录 | 过刊浏览

元素V对镍基柱状晶合金显微组织和高温蠕变性能的影响

于兴福¹(

), 周金华¹, 吴玉超¹, 杨月¹, 王宇飞², 满延林², 黄爱华³

1. 沈阳工业大学材料科学与工程学院沈阳 110870
2. 沈阳中航动力精密铸造科技有限公司沈阳 110043
3. 中航商用航空发动机有限责任公司上海 200241

Effect of V on Microstructure and High Temperature Creep Properties of Diretional Solidified Nickel-base Superalloys

YU Xingfu^1,^*(

), ZHOU Jinhua¹, WU Yuchao¹, YANG Yue¹, WANG Yufei², MAN Yanlin², HUANG Aihua³

1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
2. AVIC Power Shenyang Investment Casting Technology Co. Ltd., Shenyang 110043, China
3. AVIC Commercial Aircraft Engine Co., Ltd., Shanghai 200241, China

引用本文:

于兴福, 周金华, 吴玉超, 杨月, 王宇飞, 满延林, 黄爱华. 元素V对镍基柱状晶合金显微组织和高温蠕变性能的影响[J]. 材料研究学报, 2016, 30(6): 465-472.
Xingfu YU, Jinhua ZHOU, Yuchao WU, Yue YANG, Yufei WANG, Yanlin MAN, Aihua HUANG. Effect of V on Microstructure and High Temperature Creep Properties of Diretional Solidified Nickel-base Superalloys[J]. Chinese Journal of Materials Research, 2016, 30(6): 465-472.

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摘要:

采用定向凝固炉制备出含有不同V含量的柱状晶合金, 进行了高温蠕变性能测试和微观组织形貌观察, 研究合金化元素V对镍基柱状晶合金微观组织及高温蠕变性能的影响。结果表明: 低V含量的合金中碳化物主要以棒状形式存在, 而高V合金中碳化物主要以块状形式存在, 棒状碳化物中的V含量低于块状碳化物。随V含量的增加, 合金中碳化物由棒状向块状转变, 当V含量达到1.04%(质量分数)时, 碳化物的形貌已经完全转变成块状。铸态合金经固溶处理后, 合金中的碳化物发生溶解, 低V合金中的棒状碳化物溶解较多, 而高V合金中碳化物溶解较少。在980℃/216 MPa和760℃/725 MPa条件下低V柱状晶合金持久寿命较短, 高V合金持久寿命较长, 提高合金中的V含量有利于提高合金的蠕变寿命。高V合金与低V合金相比, 时效和蠕变期间在晶界析出M₂₃C₆型碳化物数量少。蠕变期间合金中的裂纹主要在晶内MC型碳化物及晶界析出的M₂₃C₆型碳化物处萌生和扩展。

关键词 ：金属材料, V元素作用, 微观组织, 镍基合金, 蠕变

Abstract：

The effect of alloying element V on the microstructure and high temperature creep properties of a diretional solidified nickel-base superalloy was researched by varying the amount of V addition. The alloy composition was set in a controlled fixedness except for element V, and then the effect of V can be assessed. The alloys were directionally solidified by utilizing Bridgeman casting process and followed by appropriate post heat treatment. The microstructure and high temperature creep properties of the prepared alloys were then characterized. The results shown that, with lower amount of V addition, the alloying V existed mainly in acicular type carbides rather than in blocky type carbides; while for the higher addition of V, the shape of vanadium carbides in the alloys transition from acicular type to blocky type. When the V content reaches 1.04 % in the alloy, the shape of carbides has been transformed into blocky type completely. After solid solution treatment, the carbides in the alloy were dissolved partly, and the acicular carbides in the alloy with lower V content dissolved much more than the blocky carbides in high V content alloy. Under the condition of 980℃/216 MPa and 760℃/725 MPa, the stress rupture life is shorter for the alloy with lower V content, but loger for that with higher V content. The amount of M₂₃C₆ type carbide precipitated at grain boundaries in the alloy with higher V content is less than that with lower V content during creep test and aging heat treatment. During creep test, cracks initiate and grow mainly at the MC type carbide within grains or the M₂₃C₆ type carbides precipitated at the grain boundaries. Therefore, the increase of V content is of benefit for the improvement of creep life of the alloy.

Key words： metallic materials effect of vanadium microstructure nickel-base alloy creep

收稿日期: 2016-02-25

ZTFLH:

TG146.1

作者简介: 本文联系人: 于兴福

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https://www.cjmr.org/CN/10.11901/1005.3093.2016.101 或 https://www.cjmr.org/CN/Y2016/V30/I6/465

表1 定向凝固合金棒的主要化学成分

图1 片状蠕变试样示意图

图2 镍基柱状晶合金中碳化物形貌

图3 合金中γ'相形貌

图4 固溶处理后合金中碳化物形貌

图5 完全热处理后合金中晶界析出的碳化物形貌

图6 碳化物形貌及EDAX能谱分析曲线

图7 铸态合金萃取物的XRD谱

图8 980℃/216 MPa条件下不同V含量合金的蠕变曲线

图9 760℃/725 MPa条件下不同V含量合金的蠕变曲线

表2 合金中各相的化学成分

图10 蠕变期间碳化物的分解

图11 裂纹沿碳化物形成形貌

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