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ABSTRACT
The influence of die wall lubrication on the green strength and the tensile properties of a 1.5%Mo and 0.5%C steel, both as sintered and sinterhardened at 1250°C was investigated.
Samples compacted using die wall lubrication had green strengths more than 100% higher than samples compacted at the same pressure using bulk lubrication, and a sintered density up to 98% of the pore-free ones may be achieved, compared to a maximum of 95% with bulk lubrication.
Pore morphology and the matrix microstructure and microhardness were not affected.
The tensile properties of both sintered and sinterhardened materials were much better for die wall lubrication than for bulk lubrication. Tensile strength increased up to 20%, tensile elongation up to 60%. The effectiveness of the system that delivers the lubricant on the die wall surface every stroke was verified successfully in the production of tensile specimens that do not have an axisymmetric geometry.
Acknowledgement
The project was carried out in the frame of the Life Green Steel project, LIFE16 ENV/IT/000231.
Disclosure statement
No potential conflict of interest was reported by the author(s).
Notes on contributors
Daniel Toledo dos Santos received the Master degree in Materials Engineering from Universidade Federal de Santa Catarina, Brasil, and is PhD student at the Department of Industrial Engineering, Trento University.
Mario Zadra Ph.D. degree in Materials Engineering from Trento University and is Technical Manager at K4Sint SpA.
Luca Girardini Ph.D. degree in Materials Engineering from Trento University and is CEO of K4Sint SpA.
Pietro Albonetti received the Master’s degree in Mechanical Engineering from University of Bologna, and is Mechanical Designer at SACMI IMOLA S.C. – B.U. Advanced Technologies – Technical Department (Metals).
Stefano Bordin received the diploma on Mechanical Design from IT IS Marconi Technical Institute in Padova, and is Mechanical Designer at TFM SpA.
Alberto Molinari received the Ph.D. degree in Metallurgical Engineering from Torino technical University, Italy. He is currently a professor of the Department of Industrial Engineering, Trento University. He received Honor Ph.D. by University Carlos III, Madrid in 2016 and by Cracow Technical University in 2019, and is Fellow of EPMA and of APMI.