Micro Abrasive Wear Behaviour Study of Carburization and Ion Plasma Nitriding of P20 Steel

Lopes, Henrique Solowej Medeiros; Moreto, Jeferson Aparecido; Manfrinato, Marcos Dorigão; Cruz, Nilson Cipriano da; Rangel, Elidiane Cipriano; Rossino, Luciana Sgarbi

doi:10.1590/1980-5373-MR-2015-0721

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Articles • Mat. Res. 19 (3) • May-Jun 2016 • https://doi.org/10.1590/1980-5373-MR-2015-0721 copy

Micro Abrasive Wear Behaviour Study of Carburization and Ion Plasma Nitriding of P20 Steel

Authorship SCIMAGO INSTITUTIONS RANKINGS

P20 steel, which is mainly used in plastic molds, was thermochemically treated by ion plasma nitriding and solid and gas carburization. In this work, the solid and gas carburization were performed at 925 ºC for four different durations. The ion plasma nitriding was performed at 520 ºC for four different durations. The thermochemical treatment increased the micro abrasive wear resistance of the studied material. The gas carburizing treatment resulted in a greater surface microhardness. Longer treatment times increased the effectiveness of the thickness layer in all cases. The solid carburization produced a larger thickness layer than the gas carburization and ion nitriding.

Keywords:
Gas carburizing; Solid carburizing; Ion plasma nitriding; P20 steel; Micro-abrasive Wear

Elements	C	Mn	Si	Cr	Mo
Nominal	0.35-0.45	1.30-1.60	0.20-0.40	1.80-2.10	0.15-0.25
Experimental	0.434	1.49	0.306	1.81	0.190

Carbon potential inside the furnace	1.30%
Propane flow rate	1000 cm³/h
Methane flow rate	60 cm³/h
Working pressure inside the furnace	6 psi
Carburization temperature	925 ºC
Annealing temperature	180 ºC

Atmosphere	25% H₂ and 75% N₂
Work pressure	300 Pa
Nitriding Temperature	520 ºC
Voltage	350–450 V

Temperature	520 ºC
Atmosphere	80% N₂ and 20% H₂
Pressure	350 Pa

Treatment Time (h)	Theoretical Thickness (mm)	Experimental Thickness (mm)
1	0.80	0.80
2	1.00	1.10
3	1.20	1.40
4	1.60	1.70

Treatment	Point A	Point B	Point C
Solid carburization 2 hours	8.3 wt% C	5.4 wt% C	4.1 wt% C
Solid carburization 4 hours	8.4 wt% C	6.3 wt% C	3.9 wt% C
Solid carburization 6 hours	10.5 wt% C	6.9 wt% C	4.0 wt% C
Solid carburization 8 hours	11.4 wt% C	7.5 wt% C	6.0 wt% C
Gas carburization 1 hour	11.9 wt% C	5.7 wt% C	2.4 wt% C
Gas carburization 2 hours	9.7 wt% C	4.9 wt% C	3.6 wt% C
Gas carburization 3 hours	11.4 wt% C	7.8 wt% C	4.5 wt% C
Gas carburization 4 hours	10.1 wt% C	7.9 wt% C	9.0 wt% C
Ion nitriding 2 hours	6.7 wt% N	3.5 wt% N	1.9 wt% N
Ion nitriding 4 hours	7.9 wt% N	4.1 wt% N	1.7 wt% N
Ion nitriding 6 hours	6.6 wt% N	3.8 wt% N	1.3 wt% N
Ion nitriding 12 hours	7.5 wt% N	3.9 wt% N	1.5 wt% N

Treatment	Cap Height (mm)	Layer Depth (mm)
Solid Carburization 2 hours	0.043	1.75
Solid Carburization 4 hours	0.040	2.57
Solid Carburization 6 hours	0.036	2.73
Solid Carburization 8 hours	0.020	2.78
Gas Carburization 1 hours	0.022	0.80
Gas Carburization 2 hours	0.022	1.10
Gas Carburization 3 hours	0.023	1.40
Gas Carburization 4 hours	0.027	1.70
Ion nitriding 2 hours	0.031	0.20
Ion nitriding 4 hours	0.040	0.25
Ion nitriding 6 hours	0.037	0.45
Ion nitriding 12 hours	0.032	0.90

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