铝青铜粉末等离子堆焊层硬度与组织研究
Study on Hardness and Microstructure of Plasma Surfacing Layer of Aluminum Bronze Powder
刘政军， 李 晋， 苏允海
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作者单位：（沈阳工业大学 材料科学与工程学院,辽宁 沈阳 110870）
中文关键字：铝青铜； 等离子堆焊； 硬度； 显微组织
英文关键字：aluminum bronze; plasma surfacing; hardness; microstructure
中文摘要：采用反极性弱等离子弧堆焊方法分别在无磁场和外加横向交流磁场条件下将铝青铜粉末堆焊到锅炉用钢20g母材上。通过硬度试验及金相显微方法，分析了堆焊层的力学性能及组织形貌。结果表明，无磁场作用下，堆焊层的硬度随着堆焊电流的增加而呈“小?邛大?邛小?邛大”变化，当堆焊电流为100 A时，硬度值最大，为214.7 HV；当堆焊电流为110 A时，硬度值最小，为163.7 HV。外加磁场作用下，堆焊电流取100 A，堆焊层的硬度在磁场电流为0.5 A时达到最大，为245.9 HV。堆焊电流为100 A时，堆焊层组织为致密的α-Cu和网状结构的（α+γ2），此时为较好的组织结构。
英文摘要：Aluminum bronze power was surfaced on 20 g parent metal using reverse polarity weak plasma arc without magenecic field and with lateral communication magenecic field, and its mechanical properties and microstructure were analyzed by hardness test and optical microscopy. The results indicate that, with the increase of surfacing current without magnetic field, the hardness of the surfacing changes in the form of "low?邛high?邛low?邛high", when the welding current is 100 A, the surfacing layer reaches the maximum hardness (214.7 HV); when the welding current is 110 A, the surfacing layer reaches the minimum hardness (163.7 HV). In the magnetic field, the surfacing layer reaches the maximum hardness (245.9 HV) at the surfacing current 100 A and the magnetic current 0.5A. For surfacing current is 100 A, the microstructure of the surfacing layer is compact structure of α-Cu and net structure of α+γ2.