Microstructure and Frictional Wear Behavior of FeCrNiMo Alloy Layer Fabricated by Laser Cladding
ZHAO Wanxin1, ZHOU Zheng1(), HUANG Jie1, YANG Yange2, DU Kaiping3, HE Dingyong1
1.Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China 2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 3.BGRIMM Technology Group, Beijing 100160, China
Cite this article:
ZHAO Wanxin, ZHOU Zheng, HUANG Jie, YANG Yange, DU Kaiping, HE Dingyong. Microstructure and Frictional Wear Behavior of FeCrNiMo Alloy Layer Fabricated by Laser Cladding. Acta Metall Sin, 2021, 57(10): 1291-1298.
To satisfy the requirement for martensite stainless steel layers with high efficiency, an optimized FeNiCrMo alloy layer was prepared using the laser cladding technique. The microstructure and frictional wear behavior of the cladding layer (a single layer with a thickness exceeding 2 mm) were investigated. The results confirmed a homogeneous thickness and crack-free character of the cladding layer. In the microstructure, equiaxed, dendritic and cellular grains were distributed along the thickness direction, and martensite and Cr/Mo-rich ferrite were observed in the dendritic and inter-dendritic regions, respectively. The frictional coefficient and wear volume of the cladding layer increased under increasing applied loads in a block-on-ring wear test, and the wear mechanism was dominated by abrasive and oxidative wear types. Under higher loads, adhesive wear prevailed. In a ball-on-disc wear test, increasing the temperature decreased the frictional coefficient and increased the wear volume. Oxidative and fatigue wear dominated the wear mechanism under this condition.
Fig.2 Microstructures of the cladding layer along the thickness direction, in terms of integral cross-section (a), top section (b), middle section (c), and bottom section (d) (H—thickness, DR—dendritic region, IDR—inter-dendritic region)
Area
Region
Fe
Cr
Ni
Mo
Si
Mn
A
DR
83.3
13.2
1.2
0.6
1.1
0.6
IDR
75.5
20.5
1.2
1.4
0.9
0.5
B
DR
83.7
12.9
1.1
0.5
1.2
0.6
IDR
73.6
21.9
1.1
1.3
1.2
0.9
C
DR
82.4
13.5
1.3
0.8
1.0
1.0
IDR
74.4
20.8
1.2
1.6
1.2
0.8
Table 1 EDS results for micro-area of the cladding layer in Fig.2
Fig.3 Microhardness of the cladding layer along the thickness direction
Fig.4 Frictional coefficients as a function of time for the cladding layer under different loads
Fig.5 Wear volumes and wear rates of the cladding layer under different loads
Fig.6 Worn morphologies of the cladding layer under 50 N (a), 150 N (b), and 300 N (c) loads
Fig.7 Schematics for demonstrating wear mechanism evolution of cladding layer with increased loading
Point
Fe
Cr
Ni
Mo
Si
Mn
O
1
73.9
16.4
1.4
1.1
0.9
0.7
6.6
2
72.8
14.7
1.5
1.3
0.8
0.9
8.0
3
56.5
6.3
0.8
0.7
0.5
0.6
34.6
4
66.8
12.6
1.4
0.7
0.6
0.7
17.2
Table 2 EDS results for typical regions of worn surface in Fig.6
Fig.8 Frictional coefficient as a function of time for the cladding layer under different temperature conditions
Fig.9 Wear volumes and wear rates of the cladding layer under different temperature conditions
Fig.10 Surface hardnesses of the cladding layer in relationship with elevating temperature
Fig.11 Worn morphologies of the cladding layer under 25oC (a), 300oC (b), and 600oC (c) conditions
Point
Fe
Cr
Ni
Mo
Si
Mn
O
1
73.7
16.4
1.4
1.1
1.5
0.7
5.2
2
43.6
10.7
0.9
1.3
7.7
0.9
34.9
3
74.5
11.3
1.0
1.0
1.2
0.9
10.1
4
57.1
7.1
0.7
0.5
3.3
0.4
30.9
5
59.0
10.1
2.0
1.4
1.4
0.6
25.5
Table 3 EDS results for typical regions of worn surface in Fig.11
Fig.12 Schematics for demonstrating wear mechanism evolution of cladding layer with elevating temperature
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