Thermal history estimation method and thermal history estimation device for precipitation hardening aluminum alloy members

摘要

PROBLEM TO BE SOLVED: To provide a method of estimating a heat history of a precipitation-hardened aluminum alloy member, which allows for accurately estimating heat temperature the precipitation-hardened aluminum alloy member has been thermally exposed to.SOLUTION: A method of estimating a heat history of a precipitation-hardened aluminum alloy member includes: a conductivity measurement step (S10) for measuring conductivity of a precipitation-hardened aluminum alloy member before and after thermally exposure to heat; and a heat exposure temperature estimation step (S12) for estimating temperature to which the precipitation-hardened aluminum alloy member was thermally exposed by comparing change in conductivity of the precipitation-hardened aluminum alloy member before and after the heat exposure to heat and heat exposure time, and a pre-acquired change in conductivity of a precipitation-hardened aluminum alloy of the same composition as the precipitation-hardened aluminum alloy member before and after being thermally exposed to known heat and corresponding heat exposure time.SELECTED DRAWING: Figure 1