بررسی رفتار خستگی قطعات آلیاژ اینکونل 625 تولیدشده با فرایند ساخت افزایشی مبتنی بر سیم و قوس الکتریکی

نوع مقاله : علمی و پژوهشی

نویسندگان

1 فارغ التحصیل کارشناسی ارشد مهندسی مواد/ دانشگاه سیستان و بلوچستان

2 عضو هیات علمی/ دانشگاه سیستان و بلوچستان

چکیده

در این پژوهش دیوارۀ آلیاژ اینکونل 625 با فرایند ساخت افزایشی مبتنی بر سیم و قوس تولید شد. سپس ریزساختار، سختی، خواص کششی در دمای محیط و دمای 700 درجه سلسیوس و استحکام خستگی در محدودۀ پرچرخه در دو راستای جوشکاری و رسوبدهی بررسی شد. مطالعات ریزساختاری نشان داد که دیوارۀ حاوی دندریتهای محلول جامد و فازهای بیندندریتی کاربید نیوبیوم، لاوه و دلتا (Ni3Nb) بود. با افزایش ارتفاع دیواره مقدار سختی از محدودۀ 380 ویکرز در نزدیکی زیرلایه تا حدود 300 ویکرز در بالای آن کاهش یافت. استحکام تسلیم و کششی دیوارۀ تولیدی در راستای جوشکاری بهترتیب در حدود 6/6 و 6/8 درصد بالاتر و قابلیت تغییر طول 23 درصد کمتر از خواص دیواره در راستای رسوب‌گذاری بهدست آمد. نتایج آزمون خستگی با نسبت تنش 1/0 نشان داد که میانگین تعداد سیکل منجر به شکست آلیاژ در راستای جوشکاری بالاتر از راستای رسوب‌گذاری بود. شکستنگاری نمونه‌ها جوانهزنی سطحی ترک خستگی را نشان داد و تولید دیواره‌های سالم و بدون عیب با فرایند ساخت افزایشی مبتنی بر سیم و قوس را تأیید کرد.

کلیدواژه‌ها


عنوان مقاله [English]

Fatigue Properties of Inconel 625 Alloy Parts Manufactured by Wire Arc Additive Manufacturing Method

نویسندگان [English]

  • Ghasem Pirouzmanesh 1
  • Mahmood Sharifitabar 2
  • Mahdi Shafiee Afarani 2
1 University of Sistan and Baluchestan
2 Assistant Professor/ University of Sistan and Baluchestan
چکیده [English]

In the present study, Inconel 625 alloy walls were fabricated by wire arc additive manufacturing method. Microstructure, hardness, tensile properties at room temperature and 700 ˚C, and high-cycle fatigue strength in both welding and building directions of samples were evaluated. The microstructure of the wall contained dendritic Ni-based solid solution along with MC carbide, Laves, and delta inter-dendritic phases. Moreover, the Vickers hardness value decreased from 380 HV near the substrate to 300 HV in the top layer. Also, yield and tensile strengths along the welding direction were 6.6 and 8.6% higher and the elongation was 23% lower than the building direction, respectively. Furthermore, fatigue test results with the stress ratio of 0.1 showed that the number of cycles to failure was slightly higher in the welding direction. Fractography of the samples illustrated that all fatigue cracks initiated from the surface. This confirmed the soundness of the walls manufactured by this method. 

کلیدواژه‌ها [English]

  • Inconel 625
  • High-cycle fatigue
  • Additive manufacturing
  • High-temperature strength
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