مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

بررسی ریزساختار و خواص مکانیکی اتصال غیرهمجنس میان سوپرآلیاژ IN738 و فولاد 17-4 PH به روش لیزر Nd:YAG پالسی

نوع مقاله : پژوهشی اصیل

نویسندگان
مسعود مهرپوریان 1
احسان شکوری 2
پیام سرائیان 2
1 گروه مهندسی مکانیک، واحد تهران شمال، دانشگاه آزاد اسلامی، تهران، ایران
2 گروه مهندسی مکانیک، واحد تهران شمال، دانشگاه آزاد اسلامی، تهران، ایران.
10.48311/mme.2025.27742
چکیده
این پژوهش به بررسی جوشکاری لیزر پالسی Nd:YAG برای اتصال ناهمجنس سوپرآلیاژ پایه نیکل IN738 به فولاد زنگ‌نزن رسوب‌سخت‌شونده 17-4 PH می‌پردازد. هدف اصلی این مطالعه، بررسی تأثیر پارامترهای فرآیند جوشکاری بر خواص مکانیکی و ریزساختاری اتصال می­باشد. تصاویر میکروسکوپ الکترونی(SEM) ، نشان داد که در سوپرآلیاژ IN738، به دلیل ظرفیت گرمایی بالاتر و هدایت حرارتی کمتر، رشد سلولی به دندریت‌های ستونی هم‌محور تبدیل گردید. در مقابل، در فولاد زنگ‌نزن 17-4 PH ، شیب دمایی بالا سبب رشد صفحه‌ای و تشکیل دانه‌های ریز با ساختار ستونی شد. افزایش فرکانس و مدت زمان پالس، افزایش ابعاد حوضچه جوش و کاهش طول ترک­­های انجمادی و ترک در ناحیه متأثر از حرارت (HAZ)، را در پی داشت. افزایش سرعت جوش­کاری، ابعاد حوضچه جوش را کاهش داد. با افزایش سرعت جوشکاری تا 3/8 میلی­متر بر ثانیه، طول ترک­های انجمادی و  ترک در ناحیه (HAZ)، به­ترتیب در حدود 92% و 83% کاهش یافت و با ادامه روند افزایش سرعت جوشکاری تا 13 میلی­متر بر ثانیه، طول ترک­ در ناحیه (HAZ)، افزایش چشمگیری نشان داد. نتایج نشان داد، بر خلاف سرعت جوشکاری، افزایش فرکانس و مدت زمان پالس، افزایش میکروسختی نمونه­ها را به دنبال داشته است.  نتایج آزمون پانچ کوچک (SPT) نشان داد، نمونه‌های حاوی دانه‌های ریز هم‌محور با توزیع یکنواخت فازهای رسوبی (γ′  و کاربیدهای MC)، بالاترین استحکام و چقرمگی را دارند. این یافته‌ها می‌توانند مبنای طراحی فرآیندهای تعمیر و اتصال مؤثر در بخش انرژی و صنایع هوافضا قرار گیرند.
کلیدواژه‌ها
جوشکاری لیزری پالسی
اتصال غیرهمجنس
سوپرآلیاژ IN738
فولاد زنگ‌نزن 17-4PH
ریز ساختار

موضوعات

عنوان مقاله English

Investigation of Microstructural and Mechanical Properties Dissimilar Joint Between IN738 Superalloy and 17-4 PH Steel Using Pulsed Nd:YAG Laser Welding

نویسندگان English

masoud mehrpourian 1
Ehsan Shakouri 2
payam saraeian 2
1 Department of Mechanical Engineering, North Tehran Branch, Islamic Azad University, Tehran, Iran.
2 Department of Mechanical Engineering, North Tehran Branch, Islamic Azad University, Tehran, Iran.
چکیده English

This study investigates pulsed Nd:YAG laser welding for dissimilar joining of nickel-based superalloy IN738 and precipitation-hardened stainless steel 17-4 PH. The main objective of this study is to investigate the effect of welding process parameters on the mechanical and microstructural properties of the joint. Scanning electron microscopy (SEM) revealed that in IN738 superalloy due to its higher heat capacity and lower thermal conductivity cellular growth transitioned into columnar coaxial dendrites. In contrast, the steep thermal gradient in 17-4 PH stainless steel promoted planar growth, forming fine grains with a columnar structure. Increasing pulse frequency and duration enlarged the weld pool dimensions while reducing Length of solidification cracks and heat-affected zone (HAZ) cracking. Higher welding speeds decreased weld pool size; at 8.3 mm/s, solidification and HAZ crack lengths were reduced by 92% and 83%, respectively. However, further increases in welding speed (up to 13 mm/s) significantly intensified HAZ cracking. The results showed that, unlike the welding speed, increasing the frequency and pulse duration resulted in an increase in the microhardness of the samples. Small punch test (SPT) results demonstrated that samples with fine, coaxial grains and uniform precipitation phases (γ′ and MC carbides) exhibited the highest strength and toughness. These findings provide a foundation for designing effective repair and joining processes in energy and aerospace applications. 

کلیدواژه‌ها English

Pulsed Laser Welding
Dissimilar Joint
IN738 superalloy
17-4PH stainless steel
Microstructural Characterization
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