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| Microstructures and Mechanical Properties of Helical Bevel Gears Made by Mn-Cu Alloyed Austempered Ductile Iron |
| LIU Sheng-fa,CHEN Yang,CHEN Xin,MIAO Hua-ming |
| School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, China |
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Abstract Austempered ductile iron (ADI) has several advantages of replacing cast steel and forged steel in many engineering fields. A new Mn-Cu alloyed ADI with excellent mechanical properties has been developed in order to cut the cost and enlarge the application of ADI. The helical bevel gears were made of the new-developed Mn-Cu alloyed ADI. The microstructure and mechanical properties of the standard sample were investigated by optical microscope (OM), scanning electron microscope (SEM) and performance measurement. The results showed that after a series of treatments, the mechanical properties (Rm 1007��4 to 1200 MPa, A 5��2% to 8��8%, HRC 32 to HRC 35, ��K 70 to 120 J/cm2) of the Mn-Cu alloyed ADI standard sample could reach European standard EN1564-97/ EN-CJS-1000-5. The surface hardness after helical bevel gears meshing was significantly increased due to the formation of martensite. The bench test and traffic running testing results suggested that the new Mn-Cu alloyed ADI with ultimate life and median life respectively exceeding 30��104 and 50��104 times could replace 20CrMnTi forged steel for manufacturing the EQ140 helical bevel gears.
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Received: 27 October 2010
Published: 23 February 2012
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2012, Vol. 19 
