| 钢表面激光快速熔凝的组织特征 |
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| 引用本文： | 刘江龙 邹至荣. 钢表面激光快速熔凝的组织特征[J]. 激光技术, 1990, 14(1): 30-33 |
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| 作者姓名： | 刘江龙 邹至荣 |
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| 作者单位： | 1.重庆大学 重庆 |
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| 摘 要： | 本文采用2kW横流二氧化碳激光器进行了CrWMn钢的快速动态熔凝处理.在本实验条件下,借助光学显微镜、扫描电镜和显微硬度仪,揭示了钢表层在激光动态凝固之后,其宏观凝固组织是非均匀的.这种非均匀性表现在两个方面,①在熔区边缘(B区)内,白色组织与黑色组织混合共存;②熔区中心(A区)组织与B区组织的混合共存.研究表明:白色组织为残余奥氏体,其显微硬度为HV0.2300kgf/mm2,而黑色组织为回火马氏体和残余奥氏体,其显微硬度为HV0.2620kgf/mm2.最后指出形成凝固组织不均匀的原因在于对流运动特征所致.
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| 关 键 词： | 合金钢 激光 溶化 凝固 组织 热处？ |
| 收稿时间： | 1989-10-27 |
The structure feature of solidied surface by laser irradiating |
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| Abstract: | The surface structure of the low alloying steel CrWMn after laser solidification,with a 2kW CO2 laser,was examined by optical microscopy,and scanning electron microscopy.Experimental results showed that the macroscopical solidification structure of the steel surface was heterogeneous.The structure was ① a mixture of the white structure and the black structure in the edge of the melt zone (B zone),and ② a mixture of the center of the melt zone(A zone) structure and the B zone structure.The white structure was residual austenite(HV0.2300kgf/mm2),but the black structure was tempered martensite and residual austenite(HV0.2620kgf/mm2).Finally,it is pointed out that the phenomenon is brought obout by the nature of convection movement. |
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