مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

مطالعه‌ی تجربی پارامترهای فرآیند روکش‌کاری لیزری پودر فولاد مارتنزیت بر روی فولاد ساده کربنی: هندسه‌ی روکش، نسبت آمیختگی و سختی نمونه

نوع مقاله : پژوهشی اصیل

نویسندگان
جواد رفیعی
احمدرضا قاسمی
دانشکده مهندسی مکانیک، دانشگاه کاشان، کاشان
10.52547/mme.22.4.243
چکیده
روکش ­کاری لیزری قطعات مختلف صنعتی برای مقاوم­ سازی و بهبود خواص مکانیکی آنها توسط آلیاژها و کامپوزیت­های فلزی، مورد توجه محققان و صنعت بوده است. کیفیت و خصوصیات لایه­ ی روکشی توسط عوامل زیادی از قبیل هندسه­ ی روکش، ریزساختار، میزان آمیختگی، وجود نقص، اعوجاج، صافی­ سطح، تغییرات متالورژیکی در زیر­لایه و بازدهی فرآیند مشخص و تعیین می­ شود. در این مقاله لایه روکشی پودر فولاد زنگ نزن مارتنزیتی (PH4-17) بر روی زیر­لایه ­ی فولاد ساده ­ی کربنی توسط لیزر پیوسته­ ی حالت جامد با حداکثر توان 2 کیلو وات و روش رسوب مستقیم پودر فلز ایجاد شد. مطلوب­ترین پارامترهای مهم فرآیند درایجاد سخت­ترین لایه با کمترین میزان آمیختگی تعیین شد. اثر توان لیزر، نرخ تغذیه­ی پودر، سرعت حرکت لیزر و فاصله محل برخورد لیزر با زیرلایه از کانون آن بر روی شکل هندسی، نسبت آمیختگی و سختی نمونه ­ها مورد ارزیابی قرار گرفت. بهترین لایه با کمترین درصد آمیختگی حدود 9 درصد در سرعت حرکت لیزر10 میلیمتر­بر­ثانیه، نرخ تغذیه­ ی پودر10 گرم ­بر­دقیقه و توان لیزر 330 وات به­ دست آمد. به‌دست آوردن پارامترهای مطلوب و توزیع یکنواخت پودر روکش­کننده با بکار بردن این پارامترها، سبب ایجاد سطح روکشی یکنواخت شده است. مطالعه سختی نمونه ­ها، افزایش سختی سطح روکش ­شده به اندازه سه برابر مقدار اولیه، برای نمونه مطلوب را نشان می ­دهد.
کلیدواژه‌ها
روکش‌کاری لیزری
نرخ تغذیه پودر
لیزر پیوسته
رسوب مستقیم پودر فلز

موضوعات

عنوان مقاله English

Experimental study on laser cladding process parameters of martensitic stainless steel powder on Plain Carbon Steel: Cladding Geometry, dilution Ratio and Sample Hardness

نویسندگان English

Javad Rafiei
Ahmad Reza Ghasemi
Department of Mechanical Engineering, University of Kashan, Kashan, Iran.
چکیده English

The laser cladding of industrial parts to improve their mechanical properties by metal alloys and composites has been a challenge for scientists and experts. The quality and properties of the cladding layer are determined by many factors such as cladding geometry, microstructure, dilution ratio, defects, distortion, surface smoothness, metallurgical changes in the substrate and process efficiency. In this study, the effect of important parameters of the cladding process on the geometric shape, hardness and dilution ratio of the cladding layers of martensitic stainless steel (17-4 PH ) on the substrate of plain carbon steel by solid-state continuous laser with maximum power 2 kW and the method of direct deposition of metal powder are discussed. Variable parameters of laser cladding including powder feed rate, laser scanning speed and laser power have been studied. The parameters of surface quality, geometric shape and absence of porosity have been evaluated and compared. The minimum dilution about 9% was obtained at a 10 mm/s scanning speed, 10 g/min powder feed rate and 330 watts laser power. The results have been showed, appropriate incorporation and uniform distribution of cladding powder has created a cladding surface without any crack and porosity. By studying the hardness of the samples, it has been concluded that the hardness of the substrate surface has increased after cladding.

کلیدواژه‌ها English

Laser Ccladding
Powder feedring Rate
Continues laser
Laser direct metal powder deposition
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مهندسی مکانیک مدرس
دوره 22، شماره 4
فروردین 1401
صفحه 243-252