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- W2376962060 abstract "To enhance the thickness and hardness of nitrided layer,ultrasonic cold forging technology(UCFT) was introduced as a pre-treatment.To optimize plasma nitriding process,both original samples and samples pretreated by UCFT were nitrided in nitrogen plasma at the temperature of 450 ℃ and 520 ℃.The hardness,microstructure,morphology and composition of the nitrided samples surface were investigated by micro-hardness tester,optical microscope(OM),scanning electron microscope(SEM),3D profilo-meter and X-ray diffraction(XRD).The results show that UCFT can be introduced as a befitting pre-treatment means of plasma nitriding to Cr12MoV die steel,and an effective layer caused by severe plastic deformation with a surface hardness of 520 HV as well as a depth of about 350 μm was formed.Comparing with the nitrided original samples,a thicker and harder nitrided layer was formed on the surface of Cr12MoV die steel after the surface combined modification.The surface hardness of the samples nitrided at 520 ℃ for 4 h after UCFT pre-treatment reachesd to 1350 HV,meanwhile,its thickness was about 400 μm." @default.
- W2376962060 created "2016-06-24" @default.
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- W2376962060 date "2013-01-01" @default.
- W2376962060 modified "2023-09-28" @default.
- W2376962060 title "Microstructure and property of plasma nitrided Cr12MoV steel pretreated by ultrasonic cold forging technology" @default.
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