THE EFFECT OF BRIGHT DRAWING ON THE PROPERTIES, RESIDUAL STRESS AND MACHINABILITY OF FREE CUTTING AND ENGINEERING STEELS
This research has quantified the effects of bright drawing and drawing variables on the tensile and impact properties, machinability and residual stresses of a low carbon, leaded free cutting steel, a medium carbon free cutting steel and a low alloy steel. Drawing increases strength but impairs toughness and ductility, the effects increasing with drawing reduction. Stress relieving, at temperatures above 500 C, reduces strength and improves ductility and toughness. At lower temperatures, (even at room temperature) strain ageing occurred. Cyclic stress-strain tensile properties, strain controlled fatigue properties and fracture toughness data have been determined on typical bright drawn bars. Drawing induced surface tensile residual stresses, whilst straightening produced shallow compressive stresses. Stress relieving (at temperatures above 480 C) was effective in producing stress free bar. The processing conditions leading to the attainment of maximum machinability and a satisfactory combination of mechanical properties have been identified.
Bibliographic Reference: EUR 12202 EN (1989) 178 PP., MF, ECU 8, BLOW-UP COPY ECU 22.50 THE OFFICE FOR OFFICIAL PUBLICATIONS OF THE EUROPEAN COMMUNITIES, L-2985 LUXEMBOURG
Record Number: 1989128025600 / Last updated on: 1992-08-10
Original language: EN