晶粒度对K492高温合金疲劳性能的影响

doi:10.11901/1005.3093.2018.277

材料研究学报

2018, Vol. 32

Issue (11): 834-842 DOI: 10.11901/1005.3093.2018.277

本期目录 | 过刊浏览

晶粒度对K492高温合金疲劳性能的影响

刘志远¹, 刘勇军¹, 刘鹏^2,³, 崔传勇²(

)

1 中国航发湖南动力机械研究所株洲 412002
2 中国科学院金属研究所沈阳 110016
3 中国科学技术大学材料科学与工程学院合肥 230026

Effects of Grain Size on Fatigue Properties of K492 Superalloy

Zhiyuan LIU¹, Yongjun LIU¹, Peng LIU^2,³, Chuanyong CUI²(

)

1 China Aviation Development Hunan Institute of Power Machinery, Zhuzhou 412002, China
2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3 School of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China

引用本文:

刘志远, 刘勇军, 刘鹏, 崔传勇. 晶粒度对K492高温合金疲劳性能的影响[J]. 材料研究学报, 2018, 32(11): 834-842.
Zhiyuan LIU, Yongjun LIU, Peng LIU, Chuanyong CUI. Effects of Grain Size on Fatigue Properties of K492 Superalloy[J]. Chinese Journal of Materials Research, 2018, 32(11): 834-842.

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摘要:

研究了晶粒度对K492镍基高温合金在700℃和800℃的疲劳性能的影响,并根据扫描电镜和透射电镜的结果分析了疲劳断裂的机理。结果表明,晶粒细化提高了K492合金700℃和800℃的疲劳性能。在700℃进行高周疲劳时在冶金缺陷或某个晶面处产生疲劳裂纹;疲劳实验后位错呈带状分布,γ'相形态不发生变化,位错以切过或Orowan绕过机制通过γ'相。在800℃高周疲劳时疲劳裂纹均在缺陷处产生,部分区域的位错组态与在700℃的实验结果相似,γ'相形态不发生变化。另一部分区域的γ'相发生筏化,位错分布在基体通道中,γ'相失去对位错的钉扎作用。在700℃低周疲劳时疲劳裂纹主要起始于样品表面。在800℃低周疲劳时,疲劳裂纹主要产生于样品次表面或某个晶面处。

关键词 ：金属材料, 高温合金, 晶粒细化, 疲劳性能, 位错组态, 断裂机理

Abstract：

Effects of grain size on the fatigue properties of Ni-base superalloy K492 at 700℃ and 800℃ with various grain sizes were investigated. The fatigue fracture mechanism is analyzed by scanning electron microscopy and transmission electron microscopy. The results show that grain refinement improves the fatigue properties of K492 at 700℃ and 800℃. For high-cycle fatigue (HCF) at 700℃, fatigue cracks occur at the metallurgical defect or at a certain crystal plane. The distribution of dislocation configuration is band-like and the morphology of γ' phase does not change. The dislocations pass through the γ' phase by shearing or Orowan loops passing. For HCF at 800℃ the fatigue cracks generated at the defects. In some regions the morphology of dislocation configuration was similar to that at 700℃ HCF and the morphology of γ' phase does not change; In the other region, the γ' phase rafts and dislocations distribute in the matrix channel, and the γ' phase loses the pinning effect of dislocations. For low-cycle fatigue (LCF) at 700℃, fatigue cracks mainly originate from the surface. For LCF at 800℃, fatigue cracks mainly occur at the secondary surface or at a certain crystal plane.

Key words： metallic materials superalloy grain refinement fatigue property dislocation configuration fracture mechanism

收稿日期: 2018-04-18

ZTFLH:

TG146

基金资助:国家自然科学基金(51671189)

作者简介:

作者简介刘志远,男,1975年生,高级工程师

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https://www.cjmr.org/CN/10.11901/1005.3093.2018.277 或 https://www.cjmr.org/CN/Y2018/V32/I11/834

图1 铸态粗晶样品和细晶样品晶粒尺寸的分布

图2 两种晶粒尺寸样品热处理后的微观组织

图3 样品中疏松的分布

图4 两种样品在700℃和800℃高周疲劳的双对数坐标高周疲劳曲线(Nf为样品断裂时的载荷周次)

	700℃		800℃
	$σ f'$ /MPa	b	$σ f'$ /MPa	b
Coarse-grained	853	-0.082	1241	-0.104
Fine-grained	855	-0.04	902	-0.07

表1 粗晶和细晶K492合金在不同温度下的高周疲劳参数

图5 粗晶样品在700℃和800℃高周疲劳实验后的断口

图6 粗晶样品和细晶样品在700℃高周疲劳实验后的断口

图7 细晶K492合金在不同温度高周疲劳实验后的位错组态

图8 两种样品在700℃不同总应变幅疲劳实验的循环应力响应曲线

图9 两种样品在800℃总应变幅不同的循环应力响应曲线

图10 粗晶样品和细晶样品在700℃低周疲劳实验后的断口形貌

图11 粗晶样品和细晶样品在800℃低周疲劳实验后的断口形貌

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