ریزساختار و خواص مکانیکی فولاد A283 رویه کاری شده توسط اینکونل 625 و فولاد 347 به روش GTAW

نوع مقاله : علمی و پژوهشی

نویسنده

گروه مهندسی مواد، دانشگاه آزاد اسلامی، واحد بندرعباس، بندرعباس، هرمزگان، ایران.

چکیده

در این تحقیق، تاثیر لایه نشانی پوششی دوگانه برروی خواص ریزساختاری و مکانیکی زیرلایه‌های فولاد A283 مورد مطالعه قرار گرفته‌است. از دو نوع فلز پر کننده ی مختلف از جنس فولاد زنگ‌نزن 347 و اینکونل 625 به منظور پوشش‌دهی با بکارکیری فرایند جوش قوسی تنگستن-گاز1 (GTAW) استفاده شد و به‌کمک آزمون‌های میکروسکوپی و مکانیکی خواص روکش حاصل مورد بررسی قرار گرفت. مشاهدات میکروسکوپی نشان داد، در جایی که یک لایه روکش اعمال شد، به‌دلیل نرخ انجماد بالا، ریزساختار به‌شکل دندریت‌های ستونی در آمد. با اعمال لایه دوم، مورفولوژی دندریتی ستونی در لایه اول تغییر یافت و به حالت دندریتهای سوزنی و جزیره‌ای درآمد. طیف سنجی پراکندگی انرژی پرتو ایکس2 (EDS) حضور رسوبات کاربیدی را در هر دو نوع پوشش تایید کرد. آزمون اسکن خطی نشان داد، تغییرات غلظت شیمیایی عناصر از زیرلایه به‌سمت پوشش 347 و سپس پوشش 625 با شیب ملایمی صورت گرفت و در مقابل، با بکارگیری آلیاژ 625 برروی زیرلایه و بدون لایه واسط 347، تغییرات غلظت عناصر زیاد بود. نتایج آزمون سختی‌سنجی و سایش نشان داد که بیشترین میزان سختی و مقاومت به سایش متعلق به روکش اینکونل 625 است. در قیاس با سختی و مقاومت به سایش زیر لایه ی فولاد A283، اعمال روکش اینکونل 625 سبب افزایش سختی در حدود 41% و بهبود مقاومت به سایش تا حدود 5/3 برابر زیر لایه ی فولاد A283 گردید. همچنین اعمال یک لایه روکش 347 برروی زیرلایه سبب بهبود سختی به میزان حدود 18% و مقاومت به سایش تا حدود 7/1 برابر گردید.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Microstructure and Mechanical Properties of A283 Steel Coated by Inconel 625 and 347 Steel Using GTAW

نویسنده [English]

  • Farhad Ostovan
Department of Material Science and Engineering, Islamic Azad University, Bandar Abbas Branch, 7915893144 Bandar Abbas, Hormozgan, Iran;
چکیده [English]

In this research, the effect of double layer cladding on the microstructural and mechanical properties of A283 steel substrates has been studied. In this regard, 347 stainless steel and Inconel 625 were selected as filler rods and GTAW was used for the coating process. Microstructure and mechanical properties of the resulted coating were then examined. Microscopic observations revealed that, due to the high solidification rate, a columnar dendrite microstructure was formed, where a single layer of coating was applied. The columnar dendritic morphology of the first layer was converted to island state and acicular dendrites after applying the second layer. EDS analysis confirmed the presence of carbides in both coating layers. The results of line scan analysis indicated a mild slope in the changes of the chemical concentration of the elements from the substrate to the 347 and then 625 coating layers. On the contrary, a noticeable change in the concentration of the elements was observed by applying a single layer of 625 alloy on the substrate, without the presence of 347 alloy as inter-layer. The results of hardness and wear tests showed that the highest hardness values and wear resistance belonged to the Inconel 625 coating. By applying Inconel 625 coating, hardness values and wear resistance were respectively increased up to ~ 41% and 3.5 times higher, when compared to the same values of A283 steel substrate. Also, applying the 347 coating caused an improvement of hardness and wear resistance to ~ 18% and 1.7 times higher, respectively.

کلیدواژه‌ها [English]

  • GTAW welding
  • A283 steel
  • Coating
  • Inconel 625
  • 347 stainless steel
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