عملکرد فرسودگی چرخه بالا
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عملکرد فرسودگی چرخه بالا

عنوان فارسی مقاله: اثرات پوشش و زاویه لایه برداری در ساچمه کوبی بر عملکرد فرسودگی چرخه بالا (HCF) در Ti-6Al-4V
عنوان انگلیسی مقاله: Coverage and Peening Angle Effects in Shot Peening on HCF Performance of Ti-6Al-4V
مجله/کنفرانس: پروسیدیای مهندسی – Procedia Engineering
رشته های تحصیلی مرتبط: مهندسی مکانیک
گرایش های تحصیلی مرتبط: ساخت و تولید
کلمات کلیدی فارسی: Ti-6Al-4V، فرسودگی چرخه بالا، پوشش، ساچمه کوبی، سختی، سختی ساچمه، زاویه ضربه
کلمات کلیدی انگلیسی: Ti-6Al-4V; HCF Fatigue; Coverage; Shot Peening; Roughness; Shot Hardness; Impact Angle
نوع نگارش مقاله: مقاله پژوهشی (Research Article)
شناسه دیجیتال (DOI): https://doi.org/10.1016/j.proeng.2018.02.064
دانشگاه: Curtiss-Wright Surface Technologies/Metal Improvement Company, 58739 Wickede, Germany
ناشر: الزویر - Elsevier
نوع ارائه مقاله: ژورنال
نوع مقاله: ISI
سال انتشار مقاله: 2018
ایمپکت فاکتور: 0.970 در سال 2018
شاخص H_index: 51 در سال 2019
شاخص SJR: 0.277 در سال 2018
شناسه ISSN: 1877-7058
فرمت مقاله انگلیسی: PDF
تعداد صفحات مقاله انگلیسی: 9
وضعیت ترجمه: ترجمه نشده است
قیمت مقاله انگلیسی: رایگان
آیا این مقاله بیس است: خیر
آیا این مقاله مدل مفهومی دارد: ندارد
آیا این مقاله پرسشنامه دارد: ندارد
آیا این مقاله متغیر دارد: ندارد
کد محصول: E12565
رفرنس: دارای رفرنس در داخل متن و انتهای مقاله
فهرست انگلیسی مطالب

Abstract


1-Introduction


2-Material & Experimental Metods


3-Shot Peening


4-Results


5-Conclusions


References

نمونه متن انگلیسی مقاله

Abstract


Shot peening of titanium alloys is known to enhance the HCF strength by inducing in near-surface regions residual compressive stresses which can drastically retard the growth rates of surface cracks. In addition, the induced high dislocation densities may increase the resistance to fatigue crack initiation while the typically accompanied high surface roughness has the opposite effect. The present work aimed at studying the effect of coverage and peening angle effects in shot peening on fatigue crack initiation and micro-crack growth on Ti-6Al-4V. The coverage was varied to a wide extent ranging from 20 % to 1200 % and the peening angle from 90 to 30 degrees. Fatigue life of shot peened rotating bending hour-glass shaped and flat bending fatigue specimens was studied and compared to an electrolytically polished reference. The results indicate that low (20%) coverage peening leads to a loss in HCF strength, presumably caused by insufficient residual compressive stress fields which cannot compensate the early crack initiation caused by the high roughness. In contrast, full (100 %) up to a high (1200 %) coverage was found to result in a marked increase in HCF strength. The variation of peening angles resulted in a significant beneficial effect on the fatigue strength of the flat bending fatigue samples in direction to increasingly flat angles and high coverages (1200 %) at constant Almen intensities of 0,20 mmA. Beside the deeper compressive stress layer at flat impact angles especially the increased dislocation density and the creation of a material texture orientated 90 degrees to the cracking direction seems to be responsible for the increased fatigue strength. These results are even more interesting as those peened surfaces resulted in the highest roughness values and a topography with a starting waviness on the surface.


Introduction


The α+β Ti-6Al-4V is widely used in aerospace industry, especially aero engine components like blades, disks, drums or state of the art blisks. Shot peening is a common and broadly used post-surface treatment that increases the overall fatigue performance and/or eliminates the detrimental effects or scattering caused by the manufacturing processes. Shot peening induces compressive residual stresses in near-surface regions that can drastically retard the growth rates of fatigue cracks [1]. In addition, the induced high dislocation densities may increase the resistance to fatigue crack initiation while the typically accompanied high surface roughness can have the opposite effect. Fatigue performance of metallic parts can be markedly influenced by coverage degree in shot peening (SP) [2-3], [4]. Low coverage degrees (<< 100 %) led to fatigue lives even lower than in the untreated electropolished reference condition [5]. These results were explained by residual compressive stresses being not fully developed at low coverage degrees and, therefore, were not able to compensate the early fatigue crack initiation caused by the highly induced surface roughness from the shot peening process. The fully developed residual compressive stresses in minimum 100% coverage were then seen to drastically reduce micro-crack growth by which the early fatigue crack initiation was much overcompensated leading to marked enhancements in the overall fatigue life.

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