文档介绍：新型耐磨耐热堆焊焊条的研制摘要目前,国内外耐磨耐热堆焊材料主要是钴基的司太立合金和镍基耐磨合金, 虽然在耐磨及热稳定性等方面均有突出的优点,但是其价格昂贵,成本高,不利于应用推广。针对上述问题,本文采用H08A低碳钢焊芯,药皮中添加适量的石墨、钛铁、钒铁、钼铁、钨铁、碳化硼等,选择合理的药皮渣系,通过正交试验设计方法优化极配出焊条药皮配方,新研制出了~种Fe—C—-B 系颗粒增强铁基耐磨耐热堆焊焊条。采用金相显微镜、X射线衍射仪、洛氏硬度计、显微硬度计等分析测试手段研究了颗粒增强铁基耐磨耐热堆焊层的组织结构与性能,分析了合金元素C,Ti,W,Mo,V,B等在堆焊合金中的作用及其对堆焊层硬度和组织的影响,同时研究了石墨和钛铁加入量对堆焊层组织及硬度的影响,并且探讨了其耐磨堆焊层的磨损机制。试验研究结果如下: (1)所研制的堆焊焊条具有稳弧性能好,脱渣容易及焊道美观等良好工艺性能,焊态下堆焊层宏观硬度达63HRC以上,具有良好的抗裂性和耐磨性。(2)在焊条药皮中石墨和钛铁的加入量对堆焊层硬度具有很大的影响。随着石墨加入量的增加,堆焊层硬度增大。但当石墨量超过一定值后,堆焊层硬度增加不明显并有降低的趋势。而随着钛铁加入量的增加,堆焊层硬度先逐渐上升后逐渐下降。(3)通过金相显微观察,堆焊层组织为马氏体,残余奥氏体加弥散分布的复合颗粒相组成。经XRD测试其颗粒相为TiC、VC、WC、B4C、M02C及TiB2 等,表明通过焊接化学冶金反应,成功地原位生成了多相复合增强颗粒,使得新研制的堆焊层具有优良的耐磨耐热性能。(4)堆焊层金属试样经750℃保温6h后,随炉冷却至室温,其硬度值为 ,表明其具有良好的高温耐磨性能。(5)研制的新型耐磨耐热堆焊焊条成本低,工艺性能良好及耐磨耐热性能较高,具有很好的工程应用价值。关键词:堆焊焊条;复合增强颗粒;耐磨性;耐热性 Development of New Wear Resistant and Heat Resistant Electrode forSurfacing ABSTRACT Atpresent,materials used in wear resistance and heat resistance inthe world are mostly cobalt base stelliteand wear resistant materials ofnickel base surfacing alloys,which are too expensive toapply widely though they have some outstanding merits inthe aspects ofwear resistance,and thermal stability and SO solve theproblem above,in thispaper,we have developed one kind ofFe—C—Ti—Mo—W-V- B system particles reinforcement iron base wear resistant and heat resistant electrode for surfacing by the method of orthogonal experimental design,using H08A core wire,adding graphite,ferrotitanium,ferrovanadium,ferromolybdenum, ferrotungsten and B4C,etc,choosing appropriate microstructure and performance ofthesurfacing layers were studied by theoptical microscope,the X-ray diffraction,the Rockwell durometer and themicrohardness function oftheelements inthehard—facing alloy including C,Ti,彤Mo,杉B,etc, and the effects ofthese alloy elements on the hardness and Oil themicrostructure are also analyzed inthis the meantime,the effect ofthe amount of graphite and ferrotitan