超声滚压对2024铝合金疲劳裂纹扩展行为的影响

doi:10.13229/j.cnki.jdxbgxb.20230166

摘要/Abstract

摘要：

对航空航天用2024铝合金在空气和腐蚀环境下的疲劳裂纹扩展行为进行研究，分析对比了超声滚压对疲劳裂纹扩展行为的影响。结果表明：超声滚压处理使材料表层晶粒细化形成60~70 μm厚的塑性变形层，显微硬度相对于母材提升了45%，且由材料表面向内部呈梯度下降。超声滚压处理降低了裂纹扩展的初始速率，提升了裂纹扩展速率的增长率；超声滚压对两种环境下的疲劳性能都有显著的提升，但在空气环境下对疲劳性能的提升更为显著，这是由于腐蚀环境提升了裂纹扩展的初始裂纹扩展速率，降低了裂纹扩展速率的增长率。

关键词: 机械工程, 2024铝合金, 超声滚压, 裂纹扩展

Abstract:

The fatigue crack propagation behavior of 2024 aluminum alloy used in aerospace was studied under air and corrosion environment， and the effect of ultrasonic rolling on the fatigue crack propagation behavior was analyzed and compared. The results show that the surface grain of the material is refined by ultrasonic rolling treatment to form a plastic deformation layer with a thickness of 60-70 μm， and the microhardness is increased by 45% compared with the base metal， and the gradient decreases from the surface to the interior of the material. The initial rate of fatigue crack growth was decreased and the growth rate of fatigue crack growth was increased by ultrasonic rolling treatment. Ultrasonic rolling can significantly improve the fatigue performance in both environments， but the improvement is more significant in the air environment， because the saline environment increases the initial crack growth rate and reduces the growth rate of crack growth rate.

Key words: mechanical engineering, 2024 aluminum alloy, ultrasonic rolling, crack propagation

中图分类号:

TG146

王磊,刘小鹏,周松,安金岚,张宏杰,丛家慧. 超声滚压对2024铝合金疲劳裂纹扩展行为的影响[J]. 吉林大学学报(工学版), 2024, 54(12): 3486-3495.

Lei WANG,Xiao-peng LIU,Song ZHOU,Jin-lan AN,Hong-jie ZHANG,Jia-hui CONG. Effect of ultrasonic rolling on fatigue crack propagation behavior of 2024 aluminum alloy[J]. Journal of Jilin University(Engineering and Technology Edition), 2024, 54(12): 3486-3495.

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试样	lg c	m
USRP-treated-air	-8.543	3.921
untreated-air	-7.097	2.895
USRP-treated-3.5%-NaCl	-6.443	2.574
untreated-3.5%-NaCl	-6.300	2.548

试样	lg（da/dN）-lg（ΔK）关系	da/dN-ΔK关系
USRP-treated-air	lg（da/dN）=-8.543+3.921lg（ΔK）	da/dN=2.864×10^-9（ΔK）^3.921
untreated-air	lg（da/dN）=-7.097+2.895lg（ΔK）	da/dN=7.998×10^-8（ΔK）^2.895
USRP-treated-3.5%-NaCl	lg（da/dN）=-6.443+2.574lg（ΔK）	da/dN=3.631×10^-7（ΔK）^2.574
untreated-3.5%-NaCl	lg（da/dN）=-6.300+2.548lg（ΔK）	da/dN=5.012×10^-7（ΔK）^2.548

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