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Einfluss des Vorglühens und der Stempelgeschwindigkeit beim gezwungenen Rillenpressen auf die mechanischen Eigenschaften von kohlenstoffarmem Stahl
Author(s) -
El Mahallawy N.,
George P.,
Gad E.H.,
Abdelhaleem A.M.
Publication year - 2019
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201800146
Subject(s) - pressing , materials science , annealing (glass) , groove (engineering) , microstructure , ultimate tensile strength , elongation , composite material , high speed steel , metallurgy , ductility (earth science) , creep
Abstract Constrained groove pressing (CGP) has emerged for producing ultra‐fine‐grained materials with distinguished properties. Low carbon steel sheets were subjected to severe plastic deformation by constrained groove pressing process. The effect of pre‐processing annealing temperature, ram speed and number of passes on microstructure, mechanical properties and wear behaviour of the sheets were investigated. The 3 mm thick sheets were deformed by a constrained groove pressing die at ram speeds: 5 mm/min, 10 mm min −1 and 20 mm min −1 . Furthermore, the as received sheets were annealed at 600 °C and 900 °C, then deformed at ram speed 20 mm min −1 . The annealing temperature 900 °C led to slightly coarser grains, lower strength and larger ductility compared to those obtained after annealing at 600 °C. With lowering the ram speed to 5 mm min −1 , the number of passes could be increased to 10 passes while increasing ram speed from 5 mm min −1 to 20 mm min −1 improved the mechanical properties; after 3 constrained groove pressing passes, the ultimate tensile strength increased from 420 MPa to 490 MPa, the hardness from 174 HV 1 to 190 HV 1 and the elongation from 7.6 % to 9.5 %. Finer grains were also obtained by increasing ram speed. Wear resistance was greatly enhanced by constrained groove pressing and by the increase in ram speed.