ارتباط ریزساختار با رفتار مکانیکی فلز جوش فولاد HSLA-100 تولید شده با روش GTAW

نوع مقاله : علمی-پژوهشی

نویسندگان

1 دانشجوی دکتری، گروه مهندسی مواد، دانشکده مهندسی، دانشگاه شهید چمران اهواز، اهواز، ایران.

2 استادیار، گروه مهندسی مواد، دانشکده مهندسی، دانشگاه شهید چمران اهواز، اهواز، ایران.

3 استاد، گروه مهندسی مواد، دانشکده مهندسی، دانشگاه شهید چمران اهواز، اهواز، ایران.

چکیده

در این پژوهش، جوشکاری فولاد کم آلیاژ استحکام بالا، HSLA-100، با استفاده از سه فلز پرکننده هم­جنس با فلز پایه (HSLA-100)، ER100S-G و ER120S-G با روش GTAW انجام شد. بررسی‌های ریزساختاری با استفاده از میکروسکوپ­های نوری و الکترونی روبشی صورت پذیرفت. هم­چنین، به‌منظور ارزیابی خواص مکانیکی اتصال، آزمون­های کشش، ضربه و سختی سنجی مورد استفاده قرار گرفت. نتایج نشان داد که ریزساختار فلز جوش HSLA-100 شامل بینیت دانه­ای و فریت چندوجهی، فلز جوش ER100S-G شامل فریت­های سوزنی، ویدمن­اشتاتن و مرزدانه­ای و فلز جوش ER120S-G شامل فریت­های سوزنی، چندوجهی و شبه چندوجهی بود. به‌علاوه، تشکیل فاز ثانویه (ترکیبات) مارتنزیت/ آستنیت (M/A) در ریزساختار تمامی فلزات جوش مشاهده گردید که شکل غالب این فاز در فلزات جوش HSLA-100 و ER100S-G به‌صورت بلوکی و تشکیل شده در مرزدانه­های آستنیت اولیه و در فلز جوش ER120S-G از نوع رشته­ای بود. نتایج آزمون­های مکانیکی مشخص نمود که در میان فلزات جوش، فلز جوش ER120S-G از بالاترین میزان استحکام کششی (859 مگاپاسکال)، درصد ازدیاد طول (22%)، انرژی ضربه­ (45 ژول) و سختی (7/294 ویکرز) برخوردار بود. درحالی­که فلز جوش ER100S-G، کم­ترین استحکام کششی (775 مگاپاسکال) و سختی (4/268 ویکرز) و فلز جوش HSLA-100، کم­ترین مقاومت به ضربه (25 ژول) را از خود نشان دادند.

کلیدواژه‌ها


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