C和B的含量对K417G镍基高温合金的凝固行为和高温持久性能的影响

doi:10.11901/1005.3093.2020.257

材料研究学报

2021, Vol. 35

Issue (4): 241-250 DOI: 10.11901/1005.3093.2020.257

研究论文

本期目录 | 过刊浏览

C和B的含量对K417G镍基高温合金的凝固行为和高温持久性能的影响

舒德龙¹, 严志², 王道红³^,⁴, 谢君¹(

), 侯桂臣¹, 盛乃成¹, 李金国¹, 于金江¹, 孙晓峰¹, 周亦胄¹

^1.中国科学院金属研究所沈阳 110016
^2.中国航发航空科技股份有限公司计量理化中心成都 610503
^3.江苏飞跃机泵集团有限公司靖江 214536
^4.江苏金研新材料科技有限公司靖江 214536

Influence of C- and B-content on Solidification and High Temperature Stress Rupture Behavior of Nickel-based Superalloy K417G

SHU Delong¹, YAN Zhi², WANG Daohong³^,⁴, XIE Jun¹(

), HOU Guichen¹, Naicheng SHENG¹, LI Jinguo¹, YU Jinjiang¹, SUN Xiaofeng¹, ZHOU Yizhou¹

^1.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^2.Aecc Aero Science and Technology Co. Ltd. , Metrology Physicochemical Center, Chengdu 610503, China
^3.JiangSu Feiyue Machine & Pump Gruop Co. Ltd. , Jingjiang, 214536, China
^4.JiangSu Jinyan New Material Technology Co. Ltd. , Jingjiang, 214536, China

引用本文:

舒德龙, 严志, 王道红, 谢君, 侯桂臣, 盛乃成, 李金国, 于金江, 孙晓峰, 周亦胄. C和B的含量对K417G镍基高温合金的凝固行为和高温持久性能的影响[J]. 材料研究学报, 2021, 35(4): 241-250.
Delong SHU, Zhi YAN, Daohong WANG, Jun XIE, Guichen HOU, SHENG Naicheng, Jinguo LI, Jinjiang YU, Xiaofeng SUN, Yizhou ZHOU. Influence of C- and B-content on Solidification and High Temperature Stress Rupture Behavior of Nickel-based Superalloy K417G[J]. Chinese Journal of Materials Research, 2021, 35(4): 241-250.

全文: PDF(15689 KB) HTML

摘要:

对不同C、B含量的K417G合金进行DTA分析、等温淬火实验和950℃/235 MPa持久性能测试，并观察其组织形貌，研究了C、B含量对K417G镍基高温合金的凝固行为和高温持久性能的影响。结果表明，在合金的凝固期间C含量影响碳化物的析出温度和初生碳化物的含量，且随着C含量的提高而提高；共晶组织的析出温度主要受B元素含量影响，且共晶含量随着B含量的提高而提高。合金在950℃/235MPa条件下持久变形期间其断裂机制为裂纹在晶界处萌生并沿晶界扩展，晶界处的MC型碳化物分解成富Cr的M₂₃C₆型碳化物而使晶界的稳定性降低；在合金成分范围内提高B元素含量能改善合金在高温变形期间的晶界强度，因此适当降低合金中的C含量和提高B含量有助于改善合金的高温持久性能。

关键词 ：金属材料, 镍基高温合金, 高温持久性能, C含量, B含量

Abstract：

The influence of C- and B-content on the solidification and high temperature stress rupture behavior of K417G nickel-based superalloy have been investigated by means of DTA analysis, optical microscope, scanning electron microscope, isothermal quenching and stress rupture tests at 950℃/235 MPa. Results show that the precipitation temperature and the amounts of the primary carbide are mainly affected by the C-content, which are both increased with the rise of C-content in the alloy. During stress rupture deformation at 950℃/235 MPa, the fracture mechanism of the alloy can be described as that cracks initiate on and then propagate along grain boundaries. Wherein, the MC-type carbides on the grain boundary could decompose into M₂₃C₆-type carbide enriched in Cr, which will reduce the stability of the boundary. Within the composition range of the tested alloys, raising the B-content could increase the grain boundary strength of the alloy during deformation at high temperature. As a result, the proper decrease C-content, while increase B-content can improve the high temperature stress rupture property of the alloy.

Key words： metallic materials nickel-based superalloy high temperature stress rupture property content of C content of B

收稿日期: 2020-06-28

ZTFLH:

TG27

基金资助:国家自然科学基金(51701212);国家科技重大专项(J2019-VI-0018-0133);辽宁省自然科学基金(2019-MS-336);中国科学院科技服务网络计划区域重点项目(KFJ-STS-QYZX-079);2018年度泰州市高层次创新创业人才引进计划项目,2020年度中国科学院青年创新促进会项目

作者简介: 舒德龙，男，1988年生，博士

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	舒德龙
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	王道红
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	侯桂臣
	盛乃成
	李金国
	于金江
	孙晓峰
	周亦胄
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链接本文:

https://www.cjmr.org/CN/10.11901/1005.3093.2020.257 或 https://www.cjmr.org/CN/Y2021/V35/I4/241

表1 合金的化学成分(质量分数，%)

图1 不同C、B含量K417G合金的DTA升温曲线

图2 不同C、B含量K417G合金的DTA降温曲线

图3 不同C、B含量K417G合金凝固期间各相析出温度的变化

图4 不同C、B含量K417G合金在1310℃的等温淬火组织形貌

图5 不同C、B含量的K417G合金在1290℃等温淬火的组织形貌

图6 不同C、B含量的K417G合金在1240℃的等温淬火的组织形貌

图7 不同C、B含量K417G合金的铸态组织

图8 不同C、B含量K417G合金在950℃/235 MPa条件下的持久寿命

图9 不同C、B含量K417G合金在950℃/235 MPa条件下持久断裂后的断口宏观形貌

图10 No.2合金持久断裂后远离断口区域的晶界、近断口区域的晶粒内部和近断口区域的晶界的形貌

图11 No.2合金持久断裂后断口附近的形貌和Cr、Ti元素在裂纹附近的分布

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