TiC对铁基合金喷焊层组织与性能影响

发布时间：2018-06-30 07:45

本文选题：碳化钛 + 铁基合金　；参考：《表面技术》2017年08期

【摘要】：目的研究不同TiC添加量对铁基合金喷焊层组织与性能的影响。方法采用等离子喷焊技术在Q235表面制备了铁基合金喷焊层,借助X射线衍射分析、金相显微镜、显微硬度计以及磨粒磨损试验设备,分别对喷焊层的物相、显微组织、显微硬度、耐磨性能进行测试。结果未添加TiC的喷焊层主要由马氏体、奥氏体、(Fe,Cr)_7C_3、(Fe,Ni)固溶体等物相组成,加入不同含量的TiC后,出现了TiC、TiB_2等新物相,但各试样的衍射强度均存在相应程度的降低,某些区域的衍射峰甚至消失。随着TiC含量的增加,喷焊层的硬度和耐磨性增加,但硬度和耐磨性能在TiC添加量达到一定程度(w_(TiC)3.0%)时反而降低。当TiC添加量为3%时,喷焊层的组织致密,晶粒细化,TiC弥散分布,其颗粒对喷焊层组织产生了弥散强化和细晶强化作用;显微硬度可达843HV_(0.5),较未添加TiC喷焊层提高了约300HV_(0.5),其相对耐磨性较Q235钢提高了约12倍,显微硬度与耐磨性得到显著提高。结论添加适量的TiC颗粒,可使金属基体与硬质相达到良好匹配,从而确保了喷焊层的高硬度和良好的耐磨性能。
[Abstract]:Objective to study the effect of tic addition on the microstructure and properties of Fe-based alloy spray-welding coating. Methods Plasma spray welding technique was used to prepare Fe-base alloy spray welding layer on Q235 surface. By means of X-ray diffraction analysis, metallographic microscope, microhardness tester and abrasive wear test equipment, the phase and microstructure of the coating were analyzed. Microhardness and wear resistance are tested. Results the spray welding layer without tic was mainly composed of martensite, austenite, (FetoCr) 7C3, (Fegni Ni) solid solution and so on. After adding tic with different content of tic, some new phases such as TiC- TiB2 appeared, but the diffraction intensity of each sample decreased to a certain extent. Diffraction peaks in some regions even disappear. The hardness and wear resistance of the coating increased with the increase of tic content, but the hardness and wear resistance decreased when tic content reached a certain extent (wtic 3.0%). When the content of tic is 3, the microstructure of the spray welding layer is compact, the grain size is fine and the tic dispersion distribution is refined, and the particles have the effect of dispersion strengthening and fine grain strengthening on the microstructure of the spray welding layer. The microhardness can reach 843HV0.5, which is about 300HV0.5 higher than that without tic spray welding layer. The relative wear resistance of the coating is about 12 times higher than that of Q235 steel, and the microhardness and wear resistance are obviously improved. Conclusion adding proper amount of tic particles can make the metal matrix and hard phase match well, thus ensuring the high hardness and good wear resistance of the spray welding layer.
【作者单位】：西华大学材料科学与工程学院;
【基金】：四川省教育厅重点项目(13ZA0030)~~
【分类号】：TG174.4

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