Effect of Aging Process on Strength and Toughness of AerMet100 Steel
The effect of aging processes on the tempered microstructure and mechanical properties of the forged AerMet100 steel was investigated,while the named processes include normal aging,pre-aging + normal aging and double aging etc.The results show that high tensile strength (1978 MPa) with low impact toughness (Ak=74 J) can be obtained by the normal aging process;higher impact toughness (impact energy 102 J) can be obtained by double aging process,but tensile strength is lower (1662 MPa);however,excellent strength and toughness (σb=1946 MPa;Ak=104 J) can be obtained by pre aging + normal aging (510℃ ×30 min,OQ+482℃ ×5 h,AC) process.The improvment of strength and toughness can be attribute to that the 510℃ pre aging could promote the C atom diffusion,therewith increased the amount and the stability of the flim-like reversed austenite;besides enable the M2C precipitate to maintain a good lattice relationship with the matrix induced by the short time (≤30 min) pre aging,therefore the precipitation strengthening effect was enhanced.
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