ارزیابی تأثیر نسبت Ta/W بر ساختار میکروسکوپی و خواص تنش گسیختگی سوپرآلیاژ پایه‌نیکل PWA1483 تک‌بلور

نویسندگان

1 1- گروه مهندسی مواد، پردیس دانشگاه صنعتی اصفهان، ایران. 2- دانشکده مهندسی مواد، دانشگاه صنعتی اصفهان، ایران.

2 دانشکده مهندسی مواد، دانشگاه صنعتی اصفهان، ایران.

چکیده

در پژوهش حاضر، اثر نسبت Ta/W بر ساختار میکروسکوپی و خواص تنش گسیختگی سوپرآلیاژ پایه نیکل PWA1483 تک‌بلور بررسی شده است. بدین منظور، نمونه‌های سوپرآلیاژ تک‌بلور با نسبت‌های مختلف 0/75، 1، 1/3 و 1/5 از عناصر Ta و W به‌روش انجماد جهت‌دار بریجمن با شرایط انجمادی یکسان تحت سرعت کشش سه میلی‌متر بر دقیقه و شیب دمایی حدود هفت کلوین بر میلی‌متر ساخته شد. سپس نمونه‌ها تحت عملیات حرارتی پیرسازی استاندارد قرار گرفت. در ادامه بررسی‌های ریزساختاری با استفاده از میکروسکوپ نوری (OM) و میکروسکوپ الکترونی روبشی (SEM) و خواص تنش گسیختگی در شرایط 248 مگاپاسکال بر 982 درجه سانتی‌گراد مورد ارزیابی قرار گرفت. نتایج نشان داد با افزایش نسبت Ta/W اندازه و کسر حجمی تخلخل‌های میکروسکوپی کاهش یافته، اندازه رسوبات فاز گاماپرایم ریزتر شده و عمر تنش گسیختگی افزایش می‌یابد. نمونه با نسبت 1/5= Ta/W دارای کمترین اندازه تخلخل (18/2 میکرومتر) و بیشترین عمر تنش گسیختگی (حدود 34 ساعت) بود. همچنین نمونه با نسبت 1=Ta/W از نظر جنبه‌های ساختاری و رفتار خزشی، یکنواختی بیشتری نسبت به سایر نمونه‌ها نشان داد. به‌نظر می‌رسد فازهای فشرده توپولوژیکی (TCP) از نوع η عامل اصلی کاهش عمر تنش گسیختگی در این سوپرآلیاژ بوده و تشکیل حفره‌ها در داخل این فاز و یا فصل مشترک آن با زمینه، منشأ شروع ترک و گسیختگی نمونه بوده است.

کلیدواژه‌ها

عنوان مقاله [English]

Evaluating the Effect of Ta/W Ratio on Microstructure and Stress Rupture Properties of Ni-Based Single Crystal Superalloy PWA1483

نویسندگان [English]

  • A. Borouni 1
  • A. Kermanpur 2
  • A. Kermanpur 2
1 1- Materials Engineering Group, Pardis College, Isfahan University of Technology, Isfahan 84156-83111, Iran. 2- Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran.
2 Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran.
چکیده [English]

In this study, the effect of Ta/W ratio on the microstructure and stress rupture properties of Ni-based single crystal (SX) superalloy PWA1483 was investigated. For this purpose, single crystal (SX) superalloys with different Ta/W ratios (0.75, 1.0, 1.32 and 1.5 in wt.%) were fabricated. The alloys were directionally solidified by Bridgman method under the same solidification condition at withdrawal velocity of 3 mm/min and thermal gradient of about 7 K/mm followed by standard age hardening heat treatment. Microstructural characterization was performed using optical microscopy (OM) and scanning electron microscopy (SEM). The stress rupture properties were investigated at 982 °C and 248 MPa. The results showed that increasing the Ta/W ratio decreases the size and volume fraction of micro-pores together with the size of γ' precipitates. Hence, the stress rupture life increased. The superalloy with Ta/W ratio of 1.5 showed the minimum size of micro-porosity (18.2 μm) and the maximum stress rupture life (~34 h). The superalloy with Ta/W ratio of 1 showed the most uniform microstructure and creep behavior. It seems that the presence of topologically closed packed (TCP) η-phases is the main reason for stress rupture life decrease in SX superalloy as micro-pores initiated from TCP phases or the TCP/matrix interfaces.
 
 

کلیدواژه‌ها [English]

  • Single crystal Ni-based superalloy
  • PWA1483
  • Stress rupture properties
  • Ta/W ratio
  • TCP phases
  • Bridgman method

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مواد پیشرفته در مهندسی
دوره 39، شماره 3
آذر 1399
صفحه 1-18

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