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首页> 外文期刊>Journal of Materials Engineering and Performance >Influences of Processing and Fatigue Cycling on Residual Stresses in a NiCrY-Coated Powder Metallurgy Disk Superalloy
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Influences of Processing and Fatigue Cycling on Residual Stresses in a NiCrY-Coated Powder Metallurgy Disk Superalloy

机译：尼古利涂膜冶金盘超合金中处理和疲劳循环对残余应力的影响

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摘要

Oxidation and corrosion can attack superalloy disk surfaces exposed to increasing operating temperatures in some turbine engine environments. Any potential protective coatings must also be resistant to harmful fatigue cracking during service. The objective of this study was to investigate how residual stresses evolve in one such coating. Fatigue specimens of a powder metallurgy-processed disk superalloy were coated with a NiCrY coating, shot peened, and then subjected to fatigue in air at room and high temperatures. The effects of this processing and fatigue cycling on axial residual stresses and other aspects of the coating were assessed. While shot peening did induce beneficial compressive residual stresses in the coating and substrate, these stresses relaxed in the coating with subsequent heating. Several cast alloys having compositions near the coating were subjected to thermal expansion and tensile stress relaxation tests to help explain this response of residual stresses in the coating. For the coated fatigue specimens, this response contributed to earlier cracking of the coating than for the uncoated surface during long intervals of cycling at 760 degrees C. Yet, substantial compressive residual stresses still remained in the substrate adjacent to the coating, which were sufficient to suppress fatigue cracking there. The coating continued to protect the substrate from hot corrosion pitting, even after fatigue cracks initiated in the coating.
机译：氧化和腐蚀可以攻击暴露于在一些涡轮发动机环境中提高工作温度的超合金盘表面。任何潜在的保护涂层也必须抵抗服务期间的有害疲劳裂缝。本研究的目的是研究残留应力如何在一种这种涂层中发展。粉末冶金加工盘超合金的疲劳标本涂有尼加里涂层，喷丸，然后在室内和高温下在空气中进行疲劳。评估该处理和疲劳循环对轴向残余应力的影响和涂层的其他方面。虽然射击喷丸在涂层和基材中诱导有益压缩残余应力，但这些应力在涂层中弛豫，随后加热。对涂层附近的具有组合物的几种铸造合金经受热膨胀和拉伸应力松弛试验，以帮助解释涂层中残余应力的这种响应。对于涂覆的疲劳试样，该响应有助于涂层的早期裂缝而不是未涂覆的表面在760℃下循环的长间隔。然而，仍然存在于与涂层相邻的基底中仍然存在大致压缩残余应力。抑制那里的疲劳裂缝。即使在涂层中引发的疲劳裂纹之后，涂层继续保护基材免受热腐蚀点蚀。

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