Mechanical and fatigue properties of stress relieved type 302 stainless steel wire

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Type 302 stainless steel wire is manufactured using a cold extrusion process. The cold working increases the ultimate strength of the wire from approximately 690 MPa to 2070 MPa. However, the cold working process creates residual stresses and surface microcracks in the wire. The residual stresses and microcracks reduce the fatigue life of the wire considerably. Elimination or minimization of residual stresses and microcracks is necessary if longer fatigue life is required. Residual stresses or microcracks in a wire can be minimized by a heat treatment process, which could improve both its mechanical properties and fatigue properties. Experimental evidence shows that the stress relieving process yields maximum mechanical properties between 316 and 482 ° (600 and 900 °F). The fatigue properties of the wire are optimum at a stress relieving temperature of 649 ° (1200 °F). However, the mechanical properties such as yield strength, modulus of resilience, modulus of toughness, and ultimate strength, etc., are reduced by as much as 30% if compared to the similar properties of 316 ° (600 °F) stress relieved wire. © 1992 ASM International.

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Journal of Materials Engineering and Performance