Effect of Chemical Composition on Sag Resistance of Suspension Spring

Cyclic creep and cyclic deformation of high-strength spring steels and the evaluation of the sag effect: Part I. Cyclic plastic deformation behavior

“…Hence, the amount pct, respectively, for steel 5160 and 0.79 and 0.49 pct, respecof cyclic plastic strain as well as cyclic creep strain per cycle tively, for steel 9259. [23] Thereess has actually been detected and is demonstrated by the fore, the better cyclic creep resistance of steel 9259 noticed interlace phenomenon of the cyclic hardening/softening in the present study should mainly come from the beneficial curve; as an example, refer to Figure 7. With an increasing cyclic stress or Cr in steels can bring about certain beneficial effects, as Cr cyclic stress range, the energy associated with the dislocacan introduce the strengthening effect by the precipitation tions due to the work of cyclic deformation would increase of Cr-containing carbides (Reference 11).…”

“…[1,23,[28][29][30][31] Therefore, the beneficial Associate Springs Ltd., ISPAT Sidbec Ltd., McRobert This is in agreement (NSERC of Canada) and all the member companies in the Canadian Spring Steels Research Consortium (including with the well-known conclusion that steel 9259 has better sag resistance than steel 5160.…”

“…During such From Table I, one may notice that the two testing materia process, the number of movable dislocations would become als, namely steels 5160 and 9259, have almost the same smaller and smaller due to dislocation tangling and piling chemical composition, except for Cr and Si: 0.28 and 0.83 up. [28,30] In addition, Kawakami et al [23] found, in by dislocation intersections during cycling would result in studying the effect of chemical composition on the sag resisthe annihilation of the existing dislocations. Hence, the amount pct, respectively, for steel 5160 and 0.79 and 0.49 pct, respecof cyclic plastic strain as well as cyclic creep strain per cycle tively, for steel 9259.…”

“…With an increasing cyclic stress or Cr in steels can bring about certain beneficial effects, as Cr cyclic stress range, the energy associated with the dislocacan introduce the strengthening effect by the precipitation tions due to the work of cyclic deformation would increase of Cr-containing carbides (Reference 11). [23] the reduction in the internal stresses by reason of the aforementioned "cross-slip" and "dislocation annihilation" B. Cyclic Softening surpasses the increase resulting from work hardening, continuous cyclic softening occurs. (Cr), however, has a strong detrimental effect on stress-Under this condition, for a specific cycle, the fluctuation in relaxation behavior in spring steels, because it tends, also the internal stresses during the unloading half-cycle may for the reason of carbide formation, to concentrate itself in be high enough to make some screw dislocations crossthe carbide sites, leading to a nonuniform dispersion of slip.…”

Effect of Slag Adjustment on Inclusions and Mechanical Properties of Si-Killed 55SiCr Spring Steel

“…High strength, fatigue resistance and impact resistance are important properties of spring steels [1,2]. Non-metallic inclusion is one of the most important factors that cause fatigue fractures in spring steel [3,4].…”