مهندسی ساخت و تولید ایران

مهندسی ساخت و تولید ایران

بررسی ریزساختار و خواص مکانیکی اتصال غیر هم‌جنس فولادهای زنگ‌نزن آستنیتی AISI 310 به AISI 316 توسط جوشکاری قوسی تنگستن- گاز با جریان پالسی (PCGTAW)

نوع مقاله : مقاله پژوهشی

نویسنده
عضو هیئت‌علمی، گروه مهندسی مکانیک، واحد فسا، دانشگاه آزاد اسلامی، فسا، ایران
چکیده
در این تحقیق فلزات غیر هم­جنس فولاد زنگ­نزن آستینی ٣١٠ و ٣١٦ با استفاده از روش جوشکاری قوسی تنگستن-گاز پالسی جوشکاری شدند. جوشکاری تحت حفاظت گازهای Ar و Ar-10%CO2 و با استفاده از سه نوع فلز پرکننده ER309L، ER310 و ER316L بعنوان متغیرهای فرایند انجام شد و تأثیر نوع گاز محافظ و فلز پرکننده بر ریز ساختار و خواص مکانیکی اتصالات جوشکاری شده مورد ارزیابی قرار گرفت. ریزساختار اتصالات جوشکاری شده توسط میکروسکوپ نوری مورد بررسی قرار گرفت. ارزیابی خواص مکانیکی جوش­ ها توسط آزمون کشش، ریزسختی سنجی و ضربه انجام شد. نتایج به دست آمده نشان دادند که تغییر نوع فلز پر کننده باعث ایجاد تغییر در ریزساختار، به ویژه در مورفولوژی فریت می­ شود که فلز پرکننده ٣١٦ باعث تولید فریت اسکلتی ستونی در ریز ساختار جوش ­ها شد و در ریزساختار مابقی جوش­ ها، فریت اسکلتی هم­محور مشاهده شد. همچنین در نمونه های جوشکاری شده با گاز محافظ مخلوط به دلیل افزایش حرارت ورودی، فاز فریت درشت دانه­تر در ریزساختار جوش­ ها دیده شد و انرژی ضربه کاهش یافت. در تمامی نمونه ­های جوشکاری شده پس از آزمون کشش، شکست در منطقه HAZ و فلز پایه رخ داد که نشان از استحکام کششی بالای فلز جوش در اتصال تمامی نمونه ­ها دارد. در آخر، با مقایسه نتایج به دست آمده، فلز پرکننده ER309 و گاز محافظ مخلوط آرگون و CO2 مناسب ترین انتخاب برای اتصال غیر هم­جنس فولاد زنگ ­نزن آستینی ٣١٠ و ٣١٦ تشخیص داده شد.
کلیدواژه‌ها

عنوان مقاله English

Evaluation of the microstructure and mechanical properties of dissimilar welds between AISI310 and AISI316 austenitic stainless steels by pulsed current gas tungsten arc welding (PCGTAW)

نویسنده English

Mozafar Sokhanpardaz
Faculty Member, Department of Mechanical Engineering, Fasa Branch, Islamic Azad University, Fasa, Iran
چکیده English

In this research, dissimilar metals of austenitic stainless steel 310 and 316 were welded using Pulsed Current Gas Tungsten Arc Welding (PCGTAW) method. Welding was performed under the protection of Ar and Ar-10% CO2 gases and using three filler metals ER309L, ER310 and ER316L as process variables, and the effect of different shielding gases and filler metals on the microstructure and mechanical properties of the welded samples were evaluated. The microstructure of welded joints was examined by optical microscope. Mechanical properties of joints were evaluated using tensile, microhardness and impact tests. The results obtained have shown that changing the type of filler metal causes a change in the microstructure, especially in the morphology of ferrite, and the filler metal 316 resulted in the formation of columnar skeletal ferrite in the microstructure of the welds and Coaxial skeletal ferrite was observed in the microstructure of the remaining welds as well. Also, in specimens welded with the mixed shielding gas, due to the increase in the input heat, coarse-grained ferrite phase was seen in the microstructure of the welds and the impact energy decreased. After the tensile test, the failure of all tested samples occurred in the HAZ area and the base metal, which shows the high tensile strength of the weld metal in all specimens. Finally, by comparing the obtained results, the ER309 filler metal and mixed shielding gas of Ar-10% CO2, were identified as the most suitable option for joining dissimilar austenitic stainless steel 310 to 316.

کلیدواژه‌ها English

Austenitic Stainless Steel
Gas Tungsten Arc Welding
Dissimilar Joint
Shielding Gas
Filler Metal
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