Dry sliding wear behavior of Astaloy85Mo steel surface melted by gas tungsten arc welding

Subject Areas : journal of New Materials

امیر Aliabadi ¹ ( دانشجوی کارشناسی ارشد، دانشکده متالورژی و مهندسی مواد، دانشگاه تهران، تهران، ایران )
محمود Heydarzadeh Sohi ² ( استاد، دانشکده متالورژی و مهندسی مواد، دانشگاه تهران، تهران، ایران. )
محمد Ghambari ³ ( استادیار، دانشکده متالورژی و مهندسی مواد، دانشگاه تهران، تهران، ایران. )
کاوه Sheikhi Moghadam ⁴ ( دانشجوی دکتری، دانشکده متالورژی و مهندسی مواد، دانشگاه تهران، تهران، ایران. )

Received: 2015-11-23 Accepted : 2017-11-16 Published : 2017-08-23

Keywords: Microstructure, hardness, Wear, Astaloy85Mo, TIG, Surface melting,

Abstract :

       In this study, Astsloy85Mo powder metallurgy steel specimens were surface melted using Tungsten Inert Gas (TIG) process. The effects of different parameters of the process on the microstructure, hardness, and wear resistance of the melted surfaces were studied using optical and scanning electron microscope equipped with EDS, Vickers hardness unit and pin on flat wear test machine. Surface melting resulted in structural refinement and the hardness of the melted layers reached to the values of up to 800 HV10, more than five times of that of the base PM steel which was about 150 HV10. Moreover, surface melting reduced the wear rate to 100 times lower than that of the base steel. It can be concluded that TIG can be used effectively for surface melting to improve the wear resistance of the Astaloy85Mo powder metallurgy steel surface.

References:

1- J. Wang and H. Danninger, "Dry sliding wear behavior of molybdenum alloyed sintered steels", Wear, Vol. 222, pp.49-56, 1999.
  2- D. Whittaker, "Current and future forces driving automotive PM", Metal

 Powder Report, Vol. 55, pp. 22-24, 2000.

 3- S.Tekeli, A. Güral and D. Özyürek, "Dry sliding wear behavior of low carbon dual phase powder metallurgy steels", Materials and Design, Vol. 28, pp. 1685-1688, 2007.

4- B. Dubrujeaud, M. Vardavoulias and M. Jeandin, "The role of porosity in the dry sliding wear of a sintered ferrous alloy", Wear, Vol. 174, pp. 155-161, 1994.

5- M. Askari, H. Khorsand and S.M.S. Aghamiri, "Influence of case hardening on wear resistance of a sintered low alloy steel", Journal of Alloys and Compounds, Vol. 509, pp. 6800-6805, 2011.

6- M. Eroglu and S. Önalp, "Tungsten inert gas surface modification of SAE 4140 steel", Materials Science and Technology, Vol. 18, pp. 1544-1550, 2002.

7 -ا. میرزا سید حسن، ح. خرسند و ح. ذاکر حقیقی، "بررسی اثر نرخ سرمایش در فرآیند مستقیم سرد شدن از دمای تف جوشی بر رفتار سایشی فولاد پیش آلیاژی "Astaloy85Mo، اولین همایش ملی فولادهای پیشرفته، کرمان، ایران، بهمن ماه 1389.
  8- B. Rivolta, R. Gerosa, G. Silva, A. Tavasci and U. Engstrom, "Wear performances of surface hardened PM steel from pre-alloyed powder", Wear, Vol. 289, pp. 160-167, 2012.

9- H. Ozkan Gulsoy, M. Kemal Bilici, Y. Bozkurt and S. Salman, "Enhancing the wear properties of iron based powder metallurgy alloys by boron additions", Materials and Design, Vol. 28, pp. 2255-2259, 2007.        

10- K. Sheikhi Moghaddam, M. Ghambari, H. Farhangi, N. Solimanjad, A. Bergmark and H. Khorsand, "Microstructural aspects and wear behavior of sinter hardened distaloy HP", Steel Research International, Vol. 82, pp.1297-1303, 2011.
  11- J. De Damborenea, "Surface modification of metals by high power lasers", Surface and Coatings Technology, Vol. 100, pp. 377-382, 1998. 

12- D. Llewellyn and R. Hudd, "Steels: Metallurgy and Applications", 3rd ed., p. 221. Butterworth-Heinemann, 1998.

13- ح. مظاهری، ع. اعلایی و م. فاضل، "ریزساختار، سختی و مقاومت به سایش لایه سخت حاوی ذرات کاربید سیلیسیم روی فولاد ASTM A106 ایجاد شده به روش جوشکاری GTAW"، مواد نوین، جلد 6، شماره 1، صفحات 121-136، 1394.

14- Z. Brytan, L. Dobrzański and W. Pakieła, "Laser surface alloying of sintered stainless steels with SiC powder", Journal of Achievements in Materials and

Manufacturing Engineering, Vol. 47, pp. 42-56, 2011.         

15- Z. Brytan, M. Bonek and L. Dobrzański, "Microstructure and properties of laser surface alloyed PM austenitic stainless steel", Journal of Achievements in Materials and Manufacturing Engineering, Vol. 40, pp. 70-78, 2010.
  16- Z. Brytan, L. Dobrzański and W. Pakieła, "Sintered stainless steel surface alloyed with Si₃N₄ powder", Archives of Materials Science and Engineering, Vol. 50, pp. 43-55, 2011.     
  17- R. Colaco, E. Gordo, E. Navas, M. Otasevic and R. Vilar, "A comparative study of the wear behavior of sintered and laser surface melted AISI M42 high speed steel diluted with iron", Wear, Vol. 60, pp. 949-956, 2006.           
  18- A. Wrońska and A. Dudek, "Characteristics of surface layer of sintered stainless steels after remelting using GTAW method", Archives of Civil and Mechanical Engineering, Vol. 164, pp. 60-64, 2013.        

19- H. Fallahdoost, H. Khorsand, R. Eslami-Farsani and E. Ganjeh,  "On the tribological behavior of nanoalumina reinforced low alloy sintered steel",  Materials & Design,  Vol. 57, pp. 60–66, 2014.