Heat treatment and surface treatment method of mold steel SDCM1 for hot stamping
A surface treatment, die steel technology, applied in coating, metal material coating process, solid-state diffusion coating, etc., can solve the problem that nitrided parts cannot withstand too high contact stress and impact load, long nitriding cycle, and high cost problem, to achieve the effect of enhanced wear resistance, improved surface strength, equipment and low cost
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[0053] Example 1
[0054] In this embodiment, a die steel SDCM1 for hot stamping is heat treated and surface treated. The specific process is as follows:
[0055] (a) Heat treatment process: quenching at 1020°C, tempering at 595°C for 2h, and then tempering at 595°C for 2h. Under this heat treatment process conditions, hardness and impact toughness: hardness value is 51HRC, impact toughness value is 180J. The quenched and tempered state microstructure such as figure 1 Shown.
[0056] (b) Plasma nitriding process: voltage 850V, atmosphere ratio NH3:Ar=1:9, furnace pressure 450Pa, nitriding temperature 530℃, nitriding time 8h. The surface hardness after nitriding is 810HV0.3, and the thickness of the nitriding layer is 225μm.
Example Embodiment
[0057] Example 2
[0058] In this embodiment, a die steel SDCM1 for hot stamping is heat treated and surface treated. The specific process is as follows:
[0059] (a) Heat treatment process: quenching at 1025°C, tempering at 600°C for 2h, and then tempering at 600°C for 2h. Under the heat treatment process conditions, hardness and impact toughness: hardness value is 51HRC, impact toughness value is 190J.
[0060] (b) Plasma nitriding process: voltage 880V, atmosphere ratio NH3:Ar=1:9, furnace pressure 525Pa, nitriding temperature 540℃, nitriding time 8h. The surface hardness after nitriding is 860HV0.3, and the thickness of the nitriding layer is 264μm. figure 2 The cross-section metallographic photo of the die steel after heat treatment and surface treatment in this example is 200×.
Example Embodiment
[0061] Example 3
[0062] In this embodiment, a die steel SDCM1 for hot stamping is heat treated and surface treated. The specific process is as follows:
[0063] (a) Heat treatment process: quenching at 1030°C, tempering at 605°C for 2h, and then tempering at 605°C for 2h. Under the heat treatment process conditions, the hardness and impact toughness: the hardness value is 52HRC, and the impact toughness value is 200J.
[0064] (b) Plasma nitriding process: voltage 900V, atmosphere ratio NH3:Ar=1:9, furnace pressure 450Pa, nitriding temperature 550℃, nitriding time 6h. The surface hardness after nitriding is 850HV0.3, and the thickness of the nitriding layer is 190μm. image 3 Scanning electron microscope and point composition analysis of the cross-section of the die steel after heat treatment and surface treatment in Example 3; Figure 4 Scanning electron microscope photos and EDS energy spectrum analysis for plasma surface nitriding; Figure 5 This is the X-ray diffraction analys...
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