Medium-carbon silicon-manganese low alloy steel heat treatment process based on carbon partitioning and two-step isothermal quenching
A low-alloy steel, medium-carbon silicon-manganese technology, which is applied in the field of heat treatment technology of medium-carbon silicon-manganese low-alloy steel to achieve the effects of good comprehensive mechanical properties, improved toughness, and refined structure
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Embodiment 1
[0046] The chemical composition of medium-carbon silicon-manganese low-alloy steel is 0.28%C, 1.56%Si, 1.91%Mn, 0.83%Cr, 0.20%Ni, 0.07%V, 0.013%P, 0.004%S, and the rest is Fe, Using the German Bahr DIL805 A / D dilatometer to measure the Ms point of the carbon-silicon-manganese low-alloy steel in this composition is 316°C, the Ac3 is 852°C, and the M f It is 157°C.
[0047] (1) Forging a medium-carbon silicon-manganese low-alloy steel cast slab with a width of 100mm and a thickness of 55mm at a temperature of 1100°C into a blank with a thickness of 25mm;
[0048] (2) Obtain samples of width 10mm x thickness 10mm x length 55mm, width 6mm x thickness 4mm x length 85mm on a 25mm thick blank;
[0049] (3) Heat the sample to 900°C, keep it warm for 25 minutes, and perform austenitization treatment to obtain a fully austenitized sample;
[0050] (4) Carry out one-step isothermal quenching to the fully austenitized sample, the quenching temperature is 245°C, the quenching rate is 60°...
Embodiment 2
[0055] The chemical composition of medium-carbon silicon-manganese low-alloy steel is 0.32%C, 1.45%Si, 1.80%Mn, 1.02%Cr, 0.18%Mo, 0.10%Ni, 0.05%V, 0.06%Nb, 0.015%P, 0.005% S, the rest is Fe, the measured Ms point of steel with this composition is 300°C, Ac3 is 848°C, M f It is 141°C.
[0056] Except that the quenching temperature of one-step austempering in (4) is 261°C, the volume fraction of martensite in the obtained phase microstructure is a medium-carbon silicon-manganese low-alloy steel with a volume fraction of 35%, and the isothermal time is 60min;
[0057] (5) The quenching temperature of the second step of isothermal quenching is 200°C, and the isothermal time is 60min;
[0058] All the other are identical with embodiment 1.
[0059] The medium-carbon silicon-manganese low-alloy steel processed by the heat treatment process described in this embodiment: the tensile strength is 1582MPa, the elongation is 20.2%, the impact energy of the U-shaped notch sample reaches ...
Embodiment 3
[0061] The chemical composition of medium-carbon silicon-manganese low-alloy steel is 0.37%C, 1.86%Si, 1.03%Mn, 1.69%Cr, 0.01%P, 0.005%S, and the rest is Fe. The Ms point of the composition steel is measured is 308°C, Ac3 is 848°C, M f It is 145°C.
[0062] Except that the quenching temperature of one-step austempering in (4) is 265°C, the volume fraction of martensite in the obtained phase microstructure is a medium-carbon silicon-manganese low-alloy steel with a volume fraction of 38%, and the isothermal time is 45min;
[0063] (5) The quenching temperature of the second step of isothermal quenching is 230°C, and the isothermal time is 120min;
[0064] All the other are identical with embodiment 1.
[0065] The medium-carbon silicon-manganese low-alloy steel processed by the heat treatment process described in this embodiment: the tensile strength is 1605MPa, the elongation is 21.8%, the impact energy of the U-shaped notch sample reaches 102J, and the XRD is used to measur...
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