[10] [10] COUTURIER L, DE GEUSER F, DESCOINS M, et al. Evolution of the microstructure of a 15-5PH martensitic stainless steel during precipitation hardening heat treatment［J］. Materials & Design, 2016, 107: 416-425.

[19] [19] LAN H F, DU L X, LI Q, et al. Improvement of strength-toughness combination in austempered low carbon bainitic steel: the key role of refining prior austenite grain size［J］. Journal of Alloys and Compounds, 2017, 710: 702-710.

[20] [20] PENG J H, TANG X L, HE J T, et al. Effect of heat treatment on microstructure and tensile properties of A356 alloys［J］. Transactions of Nonferrous Metals Society of China, 2011, 21(9): 1950-1956.