The Larson-Miller equation has been used to describe the time-temperature relation for stress relief:H Mindlin and CY Ho, editors. The ASMD has quickly become the industry benchmark for materials properties of For background information on stress relieving, consult ASM HANDBOOK Volume 4 Heat Treating. It is the web-based version of the highly respected and widely used Aerospace Structural Metals Handbook (ASMH) developed by Air Force and NASA. Vocabulary The following definitions of significant terms are provided to ensure precision of meaning and consistency of usage In the event of a conflict, the definitions listed here apply.The ASMD was created by CINDAS LLC in 2007. Aerospace Structural Metals Handbook and Damage Tolerance Design Handbook, 3. CINDAS/USAF CRDA Handbook Operation, Purdue University, Lafayette, Indiana.
Raytheon has a standard (BS25526) that has similar requirements. I am sure there are some SAE aerospace standards that are similar. Standards such as SAE J217 and J230 have a requirement for the springs to be stress relieved at a temperature of 230-260 C for 30 minutes. Cold wound/coiled springs are the items with which I have the most experience.
552: Mechanical Tests of Metallic materials (1986). 1, Cindas Purdue University (1997). Brown: in Aerospace Structural Metals Handbook, Vol. 1,121.98 1.72 207 30 207 30 Fiberglass 93.59 4.46 876 127 958 139 Ti-6Al-4V 17.64 2.80 448 65 517 75 Al 7075-T6 4.41 2.70 241 35 262 38 Al 6061-T6 Cost/kg Density (g/cm3) Fty (MPa.
However, all spring design handbooks discuss this topic. I could not find any standards that cover this type of treatment, mainly because there are no universally-used standards for mechanical springs. In general, springs fabricated from patented & cold drawn steel wire (music wire) are stress relieved at 190-230 C, oil tempered carbon springs at 260-400 C, and oil tempered alloy springs at 315-425 C.
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