| 摘要: |
| 在P20模具钢表面进行激光合金化，利用金相显微镜、维氏硬度计等设备检测了合金化层的组织和性能。试验表明，激光合金化可在材料表面获得组织致密，晶粒细化，深度大，与基体结合牢固的强化层。合金化区的硬度范围为635～699 HV0.2，热影响区硬度范围为441～474 HV0.2。激光合金化试样的耐磨损性能比预硬化的P20钢提高了35%。采用激光合金化对模具表面进行强化，将大大提高模具的使用寿命。 |
| 关键词: 激光合金化 P20钢 表面改性 显微组织 硬度 |
| DOI： |
| 分类号: |
| 基金项目:浙江省教育厅科研项目（Y201120211）；浙江省高等学校优秀青年教师资助计划(2010299) |
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| Microstructure and Properties of Laser Alloying on the Surface of P20 Die Steel |
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ZHANG Wei1,2
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1.Mechanical Engineering Branch Institute, Zhejiang Institute of Mechanical & Electrical Engineering, Hangzhou 310053;2.Computer Science and Technology Postdoctoral Mobile Station, Zhejiang University, Hangzhou 310027
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| Abstract: |
| The experiments of laser alloying on the surface of P20 mold steel were conducted. The microstructure and properties of laser alloying specimens were studied. The research shows that laser alloying layer has better properties such as superfine crystals, deeper layer, and good metallurgical bonding with matrix. The hardness of the alloying zone was between 635 HV0.2 and 699 HV0.2, and hardness of the heat affected zone was between 441 HV0.2 and 474 HV0.2. The antiabrasive performance of alloying specimen increased by 35% more than that of P20 steel. The mold useful life may significantly increase by using laser alloying on the surface of mold. |
| Key words: laser alloying P20 steel surface modification microstructure hardness |
