مهندسی متالورژی

مهندسی متالورژی

تاثیر پارامترهای جوشکاری لیزر Nd:YAG پالسی بر پدیده ترک داغ در سوپرآلیاژ پایه نیکلی IN738

نوع مقاله : مقاله پژوهشی

نویسندگان
1 پژوهشکده مواد پیشرفته و انرژی های نو،‌سازمان پژوهشهای علمی و صنعتی ایران
2 گروه خوردگی و مهندسی سطح پژوهشکده مواد پیشرفته و انرژی‌های نو سازمان پژوهش‌های علمی و صنعتی ایران
3 دانشگاه تهران، دانشکده متالورژی و مواد، تهران، ایران
4 مرکز ملی علوم و فناوری لیزر ایران، تهران، ایران
چکیده
سوپرآلیاژ پایه نیکل IN738 به سبب حضور کسر حجمی بالای فاز γ´، دارای استحکام دما بالا و خواص خزشی مناسبی است که بطور گسترده ای در صنایع هوافضا ازجمله ساخت پره های توربین گازی مورد استفاده قرار می گیرد. در این پژوهش، جوشکاری خودزا و بصورت هدایتی توسط لیزر Nd:YAG ضربانی بر روی ورق هایی از جنس IN738 به ضخامت mm 1 انجام گرفت. با تغییر عوامل بسامد ضربان، مدت زمان ضربان و سرعت جوشکاری، تغییر خواص جوش ایجاد شده مورد بررسی قرار گرفت. نتایج حاصل از بررسی های ریزساختاری با میکروسکوپ نوری و الکترونی نشان داد که حساسیت به ترک ذوبی و انجمادی با افزایش بسامد ضربان و مدت زمان ضربان کاهش می یابد که مهمترین علت آن کاهش نرخ سرد شدن جوش ناشی از افزایش حرارت ورودی می باشد. بر خلاف اکثر تحقیقات صورت گرفته، در این تحقیق با افزایش سرعت جوشکاری، حساسیت به ترک ذوبی و انجمادی کاهش یافت که مهمترین علت آن حذف اثر پلاسما بر حوضچه جوش می باشد. مشخص شد که لیزر Nd:YAG ضربانی با بسامد ضربان، مدت زمان ضربان، و سرعت جوشکاری به ترتیب Hz ۲۱، ms 7 و mm/s ۹ می توان یک جوش با نفوذ کامل و با کمترین ترک به دست آورد که نتایج آزمون کشش و سختی نیز این موضوع را تائید می کند.
کلیدواژه‌ها

عنوان مقاله English

Effect of pulsed Nd:YAG laser welding parameters on hot cracking phenomenon in IN738 nickel base superalloy

نویسندگان English

Morteza Taheri 1
Koroush Shirvani 2
Ayyub Halvaee 3
Mohammad Javad Torkamany 4
1 Department of Advanced Materials and New Energies, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran
2 Department of Advanced Materials and New Energies, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran
3 Effect of Nd:YAG pulsed-laser welding parameters on microstructure and mechanical properties of GTD-111 superalloy joint
4 Iranian National Center for Laser Science and Technology, Tehran, Iran
چکیده English

IN738 Ni-based superalloy has high-temperature strength and suitable creep properties due to the presence of a high volume fraction of γ' phase, which is widely used in the aerospace industry, including the manufacture of gas turbine blades. In this research, welding was performed by pulsed Nd:YAG laser on IN738 sheets with a thickness of 1 mm. By changing the parameters of pulse frequency, pulse duration, and welding speed, the change of welding properties was investigated. The results of microstructural investigations with optical and electron microscopes showed that the sensitivity to melting and solidification cracks decreases with increasing pulse frequency and pulse duration, the most important cause of which is the decrease in the welding cooling rate due to the increase in heat input. Contrary to most of the research, in this research, by increasing the welding speed, the sensitivity to melting and solidification cracks decreased, the most important reason for which is the elimination of the effect of plasma on the weld pool. It was found that pulsed Nd:YAG laser with pulse frequency, pulse duration, and welding speed of 21 Hz, 7 ms, and 9 mm/s, respectively, can obtain a weld with full penetration and no cracks, and the tensile and hardness test results also confirm this issue.

کلیدواژه‌ها English

IN738 Superalloy
liquation crack
solidification crack
laser welding
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دوره 27، شماره 2 - شماره پیاپی 94
تابستان 1403
صفحه 125-137

  • تاریخ دریافت 22 مرداد 1402
  • تاریخ بازنگری 23 اسفند 1402
  • تاریخ پذیرش 09 تیر 1403