Solution treatment and aging processes for a nickel-saving superalloy for automobile engine valve

doi:10.13251/j.issn.0254-6051.2022.02.034

Abstract

Abstract: Microstructure, hardness and mechanical properties of a nickel-saving superalloy for automobile engine valve treated by different heat treatments were studied. The results show that the grain size of the tested alloy increases and the hardness decreases with the increase of solution treatment temperature in the range of 900-1100 ℃. When the temperature exceeds 1050 ℃, the grains grow clearly and coarsen rapidly. The solution treatment temperature should be controlled in the range of 1000-1050 ℃ to ensure the necessary precipitation conditions of the main strengthening phase and to obtain appropriate grain size. In the range of 700-760 ℃, the strength of the tested alloy increases gradually with the increase of aging temperature, but the ductility decreases gradually. When the solution treatment and aging processes are 1020 ℃×30 min(solution treatment with water cooling)+720 ℃×4 h(aging with air cooling), the tested nickel-saving superalloy can obtain preferable combination of strength and toughness and can meet the technical requirements.

Key words: air valve superalloy, nickel-saving metal material, solid solution treatment, aging, mechanical properties

CLC Number:

Zeng Yu, Wu Wei, Mo Yan. Solution treatment and aging processes for a nickel-saving superalloy for automobile engine valve[J]. Heat Treatment of Metals, 2022, 47(2): 188-192.

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