مرجع دانشجویان و مهندسین مواد

Transcription

1 هب انم خدا

2

3 ESEM KYKY- EM3200

4 XL30 Philips Kg S STM-250 Santam ASTM-E8 ASTM-E23 RKP 300 Roell Amsler ASTM-G99 A120M9V mm mm m m/s N K W S Q HQ K W. S H SEM Fe As Sn S P Ni Mo r Mn Si wt. ( -min) ( -min) ( -min) ( -min) SAn85 PAn90 PIT55

5 γ R γ R γ R γ R PIT55 PAn90 SAn85 SEM nm

6 MT γ R SAn85 (MPa) (MPa) J (HV) SAn85 PAn90 PIT55

7 MPa S Sn As P Mo r انرژي ضربه (J) SAn85 PAn90 PIT سختي (HV)

8 SAn85 PAn90 PIT55 جهت لغسش کندگي ميکروترک سطحي ناضي از پديده تغييرضکل اليههاي پرليتي در اثر ميکروترک عميق حاصل از ميکروترک سطحي حاصل از ميکروخستگي در امتداد مرز دانه نيروهاي ضديد سايص پديده ميکروخستگي پديدهي ميکروخستگي

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10 1. J. A. Hawk and R.D. Wilson, Tribology of earthmoving, mining and minerals processing, Modern Tribology Handbook, Vol. 1, United States of America, Aldrich, onsumption of steel grinding media in mills A review, Minerals Engineering, Vol. 49, 2013, J. R. Davis,"ASM specialty handbook: ast iron", ASM International, Y. Wang, T. Lei, J. Liu, Tribometallogeraphic behavior of high arbon steels in dry sliding: Microstructure and Wear, Wear, Vol. 231, 1999, Y. Wang, T. Lei, Wear behavior of steel 1080 with different microstructures during dry sliding, Wear, Vol. 194, 1996, M.H. Shaeri, H. Saghafian, S.G. Shabestari, Effects of heat treatment on microstructure and mechanical properties of r-mo steels (FMU226) used in mill liner, Materials and Design, Vol. 34, 2012, M. Powell, I. Smit, P. Radziszewski, P. leary, B. Rattray, K. G. Eriksson, L. Schaeffer, The selection and design of mill liners, Society for Mining, metallurgy, and exploration, Inc., olorado, United States of America, 2006, A. Shafiee, M. Nili-Ahmadabadi, H.M. Ghasemi, E. Hossein-Mirzaei, Wear behavior of a r-mo steel with different microstructures, in comparison with austempered ductile iron (ADI), 2009, Vol. 2, Issue 1, FMU J. A. Hawk and R.D. Wilson, Tribology of earthmoving, mining and minerals processing, Modern Tribology Handbook, Vol. 1, United States of America, A. V. Makarov, R.A. Savrai, V. M. Schastlivtsev, T. I. Tabatchikova, L. Yu. Egorova, Mechanical properties and fracture upon static tension of the high-carbon steel with different types of pearlite structure, the Physics of Metals and Metallography, Vol. 104, 2007, T. Wada, W.. Hagel, Effect of trace elements, molybdenum, intercritical heat treatment on temper embrittlement of 2-1.4r-1 Mo steel, Metallurgical Transactions A, Vol. 7A, 1976, L. Xu, N. F. Kennon, A study of the abrasive wear of carbon steels, Wear, Vol. 148, 1991,

11 Effect of Microstructure on Wear Resistance of AG Mill Liners Roozbeh Eshqian, Majid Abbasi*, Mahan Firoozbakht, Mohammad Behyar Talebipour, Ahmad Ghasemian *orresponding Author Address: Department of Materials Engineering, Babol Noshiravani University of Technology, Babol, Iran, P.O. Box: 484 Abstract Effect of microstructure on the wear resistance of AG mill liners produced from an eutectoid low alloy steel consist of 0.75wt.% carbon and 2wt.% chromium were evaluated. For this purpose, the selected heat treatment cycles were applied to achievement of pearlitic, tempered martensite and bainitic microstructures. The pin on disk wear test was used using abrasive wheel. Microstructural evaluations were done using optical and scanning electron microscopes and mechanical behavior were measured using Vickers hardness, tensile and charpy impact test methods. The results show that the wear resistance is not directly related to hardness and is related to microstructural characteristics. Also, the fine pearlitic microstructure has wear resistance near to bainitic microstructure that can be selected microstructure for the large steel castings. Keywords: ast steel, Wear resistance, Heat treatment, Fine pearlite, Retained austenite.