Preparation of WC Reinforced Co-Based Alloy Gradient Coatings on a H13 Mold Steel Substrate by Laser Cladding
<p>Schematic diagram of the impact test.</p> "> Figure 2
<p>SEM morphology of cross section of Co-based gradient coating: (<b>a</b>) morphology of the bonding area magnified 400 times; (<b>b</b>) morphology of the bonding area magnified 1000 times.</p> "> Figure 3
<p>Metallographic microstructure of the Co-based gradient coating cross section: (<b>a</b>) crystal microstructure of binding zone with magnification of 1000 times; (<b>b</b>) crystal microstructure of coating with magnification of 500 times; (<b>c</b>) crystal microstructure of coating with magnification of 1000 times.</p> "> Figure 4
<p>X-ray diffraction pattern of Co-based gradient coating surface.</p> "> Figure 5
<p>Microhardness distribution of the cross section of Co-based gradient coating.</p> "> Figure 6
<p>Friction coefficients of H13 steel substrate and Co-based gradient coating: (<b>a</b>) friction coefficient curve of H13 steel substrate; (<b>b</b>) friction coefficient curves of gradient coatings.</p> "> Figure 7
<p>Wear morphology of H13 steel substrate surface: (<b>a</b>) Surface wear morphology of the substrate at a magnification of 200 times; (<b>b</b>) Surface wear morphology of the substrate at a magnification of 200 times.</p> "> Figure 8
<p>Abrasion morphology of Co-based gradient coating surface: (<b>a</b>) Wear morphology of the gradient coating with WC content of 5% + 10% + 15%; (<b>b</b>) wear morphology of the gradient coatings with WC content of 10% + 15% + 20%; (<b>c</b>) wear morphology of the gradient coatings with WC content of 15% + 20% + 25%.</p> "> Figure 9
<p>Comparison of wear loss between substrate and Co-based gradient coating.</p> "> Figure 10
<p>Comparison of impact resistance of substrate and Co-based gradient coatings.</p> "> Figure 11
<p>SEM morphology of impact fracture of H13 steel substrate: (<b>a</b>) Fracture morphology of the substrate at a magnification of 1000 times; (<b>b</b>) Fracture morphology of the substrate at a magnification of 500 times.</p> "> Figure 12
<p>SEM morphology of impact fracture of Co-based gradient coating: (<b>a</b>,<b>b</b>) fracture morphology of binding zone; (<b>c</b>,<b>d</b>) fracture morphology of gradient coating.</p> "> Figure 13
<p>Corrosion rate comparison of substrate and Co-based gradient coatings.</p> "> Figure 14
<p>Corrosion morphology of substrate and Co-based gradient coating: (<b>a</b>) corrosion morphology of the substrate; (<b>b</b>) corrosion morphology of the gradient coating with WC content of 5% + 10% + 15%; (<b>c</b>) corrosion morphology of the gradient coating with WC content of 10% + 15% + 20%; (<b>d</b>) corrosion morphology of the gradient coating with WC content of 15% + 20% + 25%.</p> "> Figure 14 Cont.
<p>Corrosion morphology of substrate and Co-based gradient coating: (<b>a</b>) corrosion morphology of the substrate; (<b>b</b>) corrosion morphology of the gradient coating with WC content of 5% + 10% + 15%; (<b>c</b>) corrosion morphology of the gradient coating with WC content of 10% + 15% + 20%; (<b>d</b>) corrosion morphology of the gradient coating with WC content of 15% + 20% + 25%.</p> ">
Abstract
:1. Introduction
2. Experimental Materials and Methods
2.1. Material and Sample Preparation
2.2. Analysis Methods
3. Results and Discussion
3.1. Morphology and Microstructure
3.2. Hardness and Tribological Measurements
3.3. Impact Toughness Measurements
3.4. Corrosion Resistance Measurements
4. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Element | C | Si | Mn | Cr | Mo | V | P | S | Fe |
---|---|---|---|---|---|---|---|---|---|
Content (wt.%) | 0.32~0.45 | 0.80~1.20 | 0.20~0.50 | 4.75~5.50 | 1.10~1.75 | 0.80~1.20 | ≤0.03 | ≤0.03 | Bal. |
Element | C | Si | Mn | Cr | Mo | Fe | Ni | W | Co |
---|---|---|---|---|---|---|---|---|---|
Content (wt.%) | 1.15 | 1.10 | 0.50 | 29.00 | 1.00 | 3.00 | 3.00 | 4.00 | Bal. |
First Layer | Second Layer | Third Layer | |
---|---|---|---|
First sample | 95% Co + 5% WC | 90% Co + 10% WC | 85% Co + 15% WC |
Second sample | 90% Co + 10% WC | 85% Co + 15% WC | 80% Co + 20% WC |
Third sample | 85% Co + 15% WC | 80% Co + 20% WC | 75% Co + 25% WC |
Parameter | Defocusing Amount (mm) | Frequency (Hz) | Scanning Speed (mm/min) | Pulse Width (ms) | Single Pulse Energy (J) |
---|---|---|---|---|---|
Value | 20 | 30 | 100 | 2.0 | 6.5 |
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Li, C.; Yang, X.; Wang, S.; Wang, Y.; Cao, J. Preparation of WC Reinforced Co-Based Alloy Gradient Coatings on a H13 Mold Steel Substrate by Laser Cladding. Coatings 2020, 10, 176. https://doi.org/10.3390/coatings10020176
Li C, Yang X, Wang S, Wang Y, Cao J. Preparation of WC Reinforced Co-Based Alloy Gradient Coatings on a H13 Mold Steel Substrate by Laser Cladding. Coatings. 2020; 10(2):176. https://doi.org/10.3390/coatings10020176
Chicago/Turabian StyleLi, Chenchen, Xuefeng Yang, Shouren Wang, Yanjun Wang, and Jinlong Cao. 2020. "Preparation of WC Reinforced Co-Based Alloy Gradient Coatings on a H13 Mold Steel Substrate by Laser Cladding" Coatings 10, no. 2: 176. https://doi.org/10.3390/coatings10020176