TY - JOUR

T1 - Influence of the fabrication method on the wear resistance of hot forging dies

AU - Behrens, Bernd Arno

AU - Yilkiran, Timur

N1 - Funding information: Acknowledgments The presented investigations were carried out within the German Research Foundation (DFG) project No. Be-1691-23-1 ‘‘Untersuchung der Zusammenhänge zwischen Gesenkherstell-verfahren und den mikrostrukturellen Vorgängen in der Werkzeug-randschicht von Schmiedegesenken beim Schmieden’’. We are thankful for the assistance provided. The general influence of the fabrication method on the tool life in forging dies was examined at the Institute of Metal Forming and Metal-Forming Machines (IFUM). The research project was founded by the German Research Foundation (DFG). It could be demonstrated that microstructural changes in the edge layers influence the tool life.

PY - 2012/3/10

Y1 - 2012/3/10

N2 - Tools used for hot forging are subject to simultaneously acting process-related high mechanical, tribological, chemical and thermal cyclic loads. In comparison to other manufacturing methods, the resulting load spectrum leads to a failure of the form-giving tool components after a short tool life. Wear is the main reason for die failure in hot forging processes, accounting for 70 % of all causes. Other kinds of failures are thermal and mechanical cracks as well as plastic deformation (a result of the loss of hardness due to the high thermal charge). In order to reduce wear, several kinds of wear reducing methods are subject of industrial applications as well as research works. For example, nitriding and optional thin hard coating or overlay welding are effective methods to increase the wear resistance of hot forging dies. Beside the process related stresses during the service, manufacturing of forging tools itself initializes microstructural changes in their subsurface zones. During fabrication, the general influence of the fabrication method on the tool lifetime has not been considered so far. The implementation of the knowledge of this influence into the fabrication process could lead to an increased productivity of hot forging processes without using expensive and complex wear reducing methods.

AB - Tools used for hot forging are subject to simultaneously acting process-related high mechanical, tribological, chemical and thermal cyclic loads. In comparison to other manufacturing methods, the resulting load spectrum leads to a failure of the form-giving tool components after a short tool life. Wear is the main reason for die failure in hot forging processes, accounting for 70 % of all causes. Other kinds of failures are thermal and mechanical cracks as well as plastic deformation (a result of the loss of hardness due to the high thermal charge). In order to reduce wear, several kinds of wear reducing methods are subject of industrial applications as well as research works. For example, nitriding and optional thin hard coating or overlay welding are effective methods to increase the wear resistance of hot forging dies. Beside the process related stresses during the service, manufacturing of forging tools itself initializes microstructural changes in their subsurface zones. During fabrication, the general influence of the fabrication method on the tool lifetime has not been considered so far. The implementation of the knowledge of this influence into the fabrication process could lead to an increased productivity of hot forging processes without using expensive and complex wear reducing methods.

KW - Cracks

KW - EDM

KW - Hot forging

KW - Hot working steel

KW - HSC

KW - Martensite

KW - Wear resistance

UR - http://www.scopus.com/inward/record.url?scp=84861532141&partnerID=8YFLogxK

U2 - 10.1007/s11740-012-0373-y

DO - 10.1007/s11740-012-0373-y

M3 - Article

AN - SCOPUS:84861532141

VL - 6

SP - 267

EP - 276

JO - Production Engineering

JF - Production Engineering

SN - 0944-6524

IS - 3

ER -