Influence of molybdenum on the microstructure and properties of a FeCrBSi alloy coating deposited by plasma transferred arc hardfacing
Influence of molybdenum on the microstructure and properties of a FeCrBSi alloy coating deposited by plasma transferred arc hardfacing
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DOI：
10.1016/j.surfcoat.2013.02.043
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发表时间：
2013-06
影响因子：
5.4
通讯作者：
Q. Hou
中科院分区：
文献类型：
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作者：
Q. Hou
不含和含2- 6 wt.%的FeCrBSi合金粉末采用等离子转移弧（PTA）堆焊技术在普通钢表面沉积Mo（分别为不含Mo和添加Mo）。采用X射线衍射仪（XRD）、光学显微镜、扫描电镜（SEM）、能谱仪（EDS）、透射电镜（TEM）、维氏硬度计、液压万能试验机、干砂磨损试验机（DSAT）和水淬法研究了Mo对FeCrBSi合金涂层组织和性能的影响。结果表明，无Mo涂层由γ（Fe，Ni）、M7（C，B）3和（Fe，Cr）2 B相组成。Mo的加入导致M23（C，B）6、Mo 2（B，C）和Fe 3 Mo 3（C，B）相的形成，而不含Mo的涂层中存在这些相。在正交相M7（C，B）3（M=Fe，Cr，Mo）中观察到101孪晶面的孪晶。在不含Mo和2 wt.%的合金中可以看到亚共晶显微组织。添加Mo的涂层。将Mo添加量增加至4 wt.%和6 wt.%，可以获得过氧化氢微结构。加入2- 6 wt.%的钼后，无钼涂层的组织得到细化密苏里州在4 wt.%时，可以获得最细的显微组织加钼涂层在FeCrBSi合金涂层中加入Mo可提高涂层的耐磨性，但在磨粒磨损试验中偶尔发生脆性断裂，与H/E和H3/E2没有直接关系。加入2- 6 wt.%的钼后，涂层的抗热震性得到改善密苏里州在4 wt.%时，耐磨性和抗热震性最好加钼涂层
FeCrBSi alloy powders without and with 2–6wt.% Mo (Mo-free and Mo-added, respectively) were deposited on a plain steel using plasma transferred arc (PTA) hardfacing. The effects of Mo addition on the microstructure and properties of the FeCrBSi alloy coating were investigated by X-ray diffraction (XRD), optical microscopy, scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) attachment, transmission electron microscopy (TEM), Vickers hardness tester, hydraulic universal testing machine, dry sand abrasion test (DSAT) and water quenching method. The results show that the Mo-free coating consists of γ (Fe, Ni), M7(C, B)3, and (Fe, Cr)2B phases. Adding Mo leads to the formation of M23(C, B)6, Mo2(B, C) and Fe3Mo3(C, B) phases, except for those phases existed in the Mo-free coating. The twinning with 101¯ twinning plane is observed in the orthorhombic M7(C, B)3(M=Fe, Cr, Mo) phase. A hypoeutectic microstructure can be seen in the Mo-free and 2wt.% Mo-added coatings. Increasing Mo addition to 4wt.% and 6wt.%, a hypereutectic microstructure can be obtained. The microstructure of the Mo-free coating can be refined after adding 2–6wt.% Mo. The finest microstructure can be obtained in the 4wt.% Mo-added coating. Adding Mo in the FeCrBSi alloy coating can increase its abrasive wear resistance that has no direct relation with H/E or H3/E2because brittle fracture occurred occasionally in the abrasive wear test. The thermal shock resistance of the Mo-free coating can be improved after adding 2–6wt.% Mo. The best abrasive wear resistance and thermal shock resistance can be received in the 4wt.% Mo-added coating.