300M钢激光熔覆耐磨防腐自润滑涂层温度场数值模拟研究
TG174.45; 为了提高飞机起落架减震支柱300M超高强钢的抗磨性能,突破由于温度梯度过大诱发的激光熔覆耐磨防腐自润滑涂层裂纹等技术瓶颈,基于ANSYS软件的生死单元法编制热循环程序,考虑自润滑相和耐磨相材料热物性参数随温度的变化、相变潜热、激光熔覆过程中与外界的换热、激光熔覆功率、激光熔覆扫描速率等因素对激光熔覆过程温度场、熔池、温度梯度的影响,建立300M超高强钢激光熔覆耐磨防腐自润滑涂层温度仿真模型.结果表明:基体的熔化需要激光、熔化的粉末等综合作用使传导到该区域的有效能量达到熔化的临界值,熔化高度增加率随激光功率的增加先降低后增加,熔化高度减少率随激光扫描速率的增加先变小后变大;由...
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| Published in | 航空材料学报 Vol. 40; no. 2; pp. 35 - 42 |
|---|---|
| Main Authors | , |
| Format | Journal Article |
| Language | Chinese |
| Published |
中国民航大学 机场学院,天津,300300
01.04.2020
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1005-5053 |
| DOI | 10.11868/j.issn.1005-5053.2019.000051 |
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| Abstract | TG174.45; 为了提高飞机起落架减震支柱300M超高强钢的抗磨性能,突破由于温度梯度过大诱发的激光熔覆耐磨防腐自润滑涂层裂纹等技术瓶颈,基于ANSYS软件的生死单元法编制热循环程序,考虑自润滑相和耐磨相材料热物性参数随温度的变化、相变潜热、激光熔覆过程中与外界的换热、激光熔覆功率、激光熔覆扫描速率等因素对激光熔覆过程温度场、熔池、温度梯度的影响,建立300M超高强钢激光熔覆耐磨防腐自润滑涂层温度仿真模型.结果表明:基体的熔化需要激光、熔化的粉末等综合作用使传导到该区域的有效能量达到熔化的临界值,熔化高度增加率随激光功率的增加先降低后增加,熔化高度减少率随激光扫描速率的增加先变小后变大;由于激光熔覆的不同区域温度、冷却速率差异等综合因素影响,熔覆层熔池的纵截面为勺状熔池;伴随激光功率的增加,由于熔覆层不同区域对能量输入产生的温度响应速率差异导致Z方向温度梯度值增加,且最大冷却速率增加;伴随激光扫描速率的增加,激光输入能量降低,降低了高温区域温度及激光的快速局部加热等综合影响,Z方向温度梯度值降低.通过调控激光参数,在保持熔覆层结合强度的条件下,基体熔凝区能被控制到最小,并能够降低温度梯度. |
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| AbstractList | TG174.45; 为了提高飞机起落架减震支柱300M超高强钢的抗磨性能,突破由于温度梯度过大诱发的激光熔覆耐磨防腐自润滑涂层裂纹等技术瓶颈,基于ANSYS软件的生死单元法编制热循环程序,考虑自润滑相和耐磨相材料热物性参数随温度的变化、相变潜热、激光熔覆过程中与外界的换热、激光熔覆功率、激光熔覆扫描速率等因素对激光熔覆过程温度场、熔池、温度梯度的影响,建立300M超高强钢激光熔覆耐磨防腐自润滑涂层温度仿真模型.结果表明:基体的熔化需要激光、熔化的粉末等综合作用使传导到该区域的有效能量达到熔化的临界值,熔化高度增加率随激光功率的增加先降低后增加,熔化高度减少率随激光扫描速率的增加先变小后变大;由于激光熔覆的不同区域温度、冷却速率差异等综合因素影响,熔覆层熔池的纵截面为勺状熔池;伴随激光功率的增加,由于熔覆层不同区域对能量输入产生的温度响应速率差异导致Z方向温度梯度值增加,且最大冷却速率增加;伴随激光扫描速率的增加,激光输入能量降低,降低了高温区域温度及激光的快速局部加热等综合影响,Z方向温度梯度值降低.通过调控激光参数,在保持熔覆层结合强度的条件下,基体熔凝区能被控制到最小,并能够降低温度梯度. |
| Author | 刘全秀 庞铭 |
| AuthorAffiliation | 中国民航大学 机场学院,天津,300300 |
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| Author_FL | LIU Quanxiu PANG Ming |
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| Author_xml | – sequence: 1 fullname: 庞铭 – sequence: 2 fullname: 刘全秀 |
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| Keywords | 激光熔覆 自润滑 300M钢 温度梯度 |
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