مهندسی ساخت و تولید ایران

مهندسی ساخت و تولید ایران

ساخت ورق ترکیبی غیر هم ضخامت از فولاد با پلاستیسیته القایی حاصل از استحاله و فولاد دوفازی به روش جوش لیزر

نوع مقاله : مقاله پژوهشی

نویسندگان
گروه مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران، ایران
10.22034/ijme.2026.578088.2169
چکیده
در این پژوهش، با استفاده از دو فولاد استحکام بالای پیشرفته با کمینه استحکام نهایی 980 مگاپاسکال اقدام به ساخت و ارزیابی خواص مکانیکی ورق‌های ترکیبی به روش اتصال لب‌به‌لب به کمک جوش لیزر فایبر شده است. ورق ترکیبی غیرهمجنس و غیرهم‌ضخامت از فولاد دوفازی DP980 و فولاد تریپ با خاصیت پلاستیسیته ناشی از استحاله فازی TRIP980 به ترتیب با ضخامت‌های 2 و 1.8 میلی‌متر ساخته شد. در ساخت ورق ترکیبی و اتصال ورق‌های پایه، پارامترهای توان، سرعت و فرکانس جوشکاری به عنوان متغیرهای مؤثر بر جوش در نظر گرفته‌شده است که با بهره از طراحی آزمایش مناسب و آزمون اریکسون کیفیت اتصالات ارزیابی شد. برای کاهش تعداد آزمایش‌ها و پوشش مناسب فضای پارامتری از آرایه تاگوچی سه عامل L9 (سه سطح) استفاده شد. معیار پذیرش اتصال برای ورق‌های ترکیبی، عدم بازشدگی ناحیه جوش و یا ناحیه متأثر از حرارت و شروع ترک و وقوع شکست از ورق‌های پایه تحت کرنش دو محوره پس از آزمون اریکسون تعیین گردید. پس از تعیین مشخصات بهینه در اتصال جوش، نمونه انتخاب‌شده تحت آزمون‌های کشش تک‌محوره، میکروسختی سنجی و متالوگرافی نوری قرار داده شد. نتایج نشان می‌دهد مجموعه پارامترهای توان 1.5 کیلووات، سرعت 18 میلی‌متر بر ثانیه در فرکانس 18 هرتز بهترین ترکیب عملکرد مکانیکی و کیفیت آلیاژی جوش را تولید کرده است. همچنین منطقه جوش به دلیل تشکیل ساختار مارتنزیت سختی بالاتری نسبت به فلزات پایه نشان داده است و شکست در آزمون کشش تک‌محوره در سمت فولاد تریپ رخ‌داده است که نشان‌دهنده استحکام بالای جوش نسبت به استحکام ورق‌های پایه است.
کلیدواژه‌ها

عنوان مقاله English

Manufacturing of tailor-welded blanks with dissimilar thicknesses using TRIP and DP steels via laser beam welding

نویسندگان English

Amirhossein Bamdad
Ramin Hashemi
Schools of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
چکیده English

This research focuses on the fabrication and mechanical characterization of dissimilar tailor-welded blanks produced from two advanced high-strength steels with a minimum ultimate tensile strength of 980 MPa.Sheets of DP980 and TRIP980 steels with thicknesses of 2 mm and 1.8 mm, respectively, were joined by fiber laser butt welding. The primary process variables affecting joint quality including laser power, welding speed and pulse frequency were systematically investigated using a Taguchi L9 orthogonal array to optimize joint performance. Joint acceptability was established based on the requirement that neither crack initiation nor separation occur within the fusion or heat-affected zone; failure had to initiate in the base material under biaxial loading. Once the optimal welding parameters had been established, selected tailor welded blanks were further characterized through a series of mechanical and microstructural evaluations, including uniaxial tensile testing, microhardness measurments and optical metallographic analysis. The results demonstrated that the parameter combination of 1.5 kW, 18 mm/s, and 18 Hz produced the highest joint quality. The weld zone showed increased hardness due to martensitic transformation, and tensile fracture occurred in the TRIP sheet, demonstrating that the weld region possessed higher strength than the base metals.

کلیدواژه‌ها English

Dissimilar Tailor-Welded Blank
DP980 Dual-Phase Steel
Mechanical Properties
Design of Experiments
Erichsen Test
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