
东北大学学报(自然科学版) ›› 2024, Vol. 45 ›› Issue (5): 636-642.DOI: 10.12068/j.issn.1005-3026.2024.05.004
• 材料与冶金 • 上一篇
孙行1, 陈伟2, 罗昌2, 刘常升1
收稿日期:2022-12-12
出版日期:2024-05-15
发布日期:2024-07-31
作者简介:孙 行(1997-),男,辽宁鞍山人,东北大学硕士研究生Hang SUN1, Wei CHEN2, Chang LUO2, Chang-sheng LIU1
Received:2022-12-12
Online:2024-05-15
Published:2024-07-31
摘要:
为了满足对轧辊表面快速修复的需求,采用激光熔覆技术,将自主设计并制备的高钒半高速钢合金粉末熔覆到轧辊合金钢表面,考虑到锻钢轧辊和激光熔覆层组织之间的差异性,为了稳定组织,对熔覆层进行回火处理,回火温度为500 ℃并保温2 h.结果表明,熔覆层的相组成主要是马氏体;其表面主要是细小等轴晶,晶内马氏体呈针状平行分布,回火后分解为铁素体和碳化物;其横截面的平均硬度为663.4 HV,是基体硬度的1.8倍;熔覆层平均摩擦系数为0.708,磨损率为6.142×10-6 mm3·N-1·m-1,磨损性能较基体提高25倍,磨损形貌较好,与磨损量结果保持一致.
中图分类号:
孙行, 陈伟, 罗昌, 刘常升. 高钒半高速钢合金熔覆层回火态显微组织和性能[J]. 东北大学学报(自然科学版), 2024, 45(5): 636-642.
Hang SUN, Wei CHEN, Chang LUO, Chang-sheng LIU. Microstructure and Properties of Tempered High Vanadium Semi High Speed Steel Alloy Cladding Layer[J]. Journal of Northeastern University(Natural Science), 2024, 45(5): 636-642.
| 材料 | C | Si | Mn | Cr | Ni | Mo | V | Fe |
|---|---|---|---|---|---|---|---|---|
| 基体 | 0.74 | 0.70~0.90 | 0.25~0.45 | 5.00~5.50 | 0.25 | 0.96 | 0.40 | 余量 |
| 半高速钢合金粉末 | 0.74 | — | — | — | — | — | 1.60 | 余量 |
表1 轧辊合金钢及高钒半高速钢合金粉末化学成分(质量分数) ((mass fraction) %)
Table 1 The composition of roller alloy steel and high vanadium semi high speed steel alloy powder
| 材料 | C | Si | Mn | Cr | Ni | Mo | V | Fe |
|---|---|---|---|---|---|---|---|---|
| 基体 | 0.74 | 0.70~0.90 | 0.25~0.45 | 5.00~5.50 | 0.25 | 0.96 | 0.40 | 余量 |
| 半高速钢合金粉末 | 0.74 | — | — | — | — | — | 1.60 | 余量 |
图3 回火前后熔覆层的显微组织(a)—熔覆层回火前; (b)—图a局部放大; (c)—图b局部放大; (d)—熔覆层回火后; (e)—图d局部放大; (f)—图e局部放大.
Fig.3 Microstructure of cladding layer before and after tempering
| 点 | C | Fe | V | Cr | Mo | Si |
|---|---|---|---|---|---|---|
| 1 | 21.60 | 48.54 | 6.73 | 8.95 | 13.72 | 0.47 |
| 2 | 24.80 | 33.20 | 4.34 | 15.88 | 21.37 | 0.41 |
| 3 | 2.59 | 85.66 | 0.55 | 4.54 | 3.34 | 0.33 |
表2 图5c中碳化物分析结果(质量分数) (%)
Table 2 Analysis results of carbides in figure 5c (mass fraction)
| 点 | C | Fe | V | Cr | Mo | Si |
|---|---|---|---|---|---|---|
| 1 | 21.60 | 48.54 | 6.73 | 8.95 | 13.72 | 0.47 |
| 2 | 24.80 | 33.20 | 4.34 | 15.88 | 21.37 | 0.41 |
| 3 | 2.59 | 85.66 | 0.55 | 4.54 | 3.34 | 0.33 |
| 样品 | 磨痕宽度/mm | 磨损体积/mm3 | 磨损率/(mm3·N-1·m-1) | 最大摩擦系数 |
|---|---|---|---|---|
| 基体 | 1.865 | 1.112 89 | 154.567×10-6 | 0.783 |
| 熔覆层 | 0.656 | 0.044 42 | 6.142×10-6 | 0.708 |
表3 激光熔覆层摩擦磨损实验结果
Table 3 Friction and wear test results of laser cladding layer
| 样品 | 磨痕宽度/mm | 磨损体积/mm3 | 磨损率/(mm3·N-1·m-1) | 最大摩擦系数 |
|---|---|---|---|---|
| 基体 | 1.865 | 1.112 89 | 154.567×10-6 | 0.783 |
| 熔覆层 | 0.656 | 0.044 42 | 6.142×10-6 | 0.708 |
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