深松铲尖等离子堆焊涂层组织结构及性能研究  

Structure and Properties of Surfacing Coatings Subsoiler Sharp Plasma

作　　者：董升涛 胡军[1] 李庆达[1] 

机构地区：[1]黑龙江八一农垦大学工程学院,大庆163319

出　　处：《黑龙江八一农垦大学学报》2016年第4期85-88,139,共5页journal of heilongjiang bayi agricultural university

基　　金：大规模优质水稻生产全程技术及装备研究与示范(2014BAD06B01);高等学校博士学科点专项科研基金(20122305120005);黑龙江省普通高等学校重点实验室开放课题(hljbyndgc2013010)

摘　　要：磨损是深松铲尖失效的主要原因,造成材料的巨大损失。利用等离子弧堆焊技术在深松铲尖制得铁基-碳化钨复合涂层材料,增大耐磨性以延长其使用寿命。研究不同比例WC粉末的铁基合金的硬度、显微组织、在田间的摩擦磨损性能及WC粉末比例对显微组织的影响规律。结果表明:堆焊层中无裂纹、气孔等缺陷;涂层组织包括树枝晶和枝晶间多元共晶组织;在相同的试验条件下,堆焊涂层的耐磨性明显高于普通深松铲尖,且深松铲尖的耐磨性随着碳化钨质量分数的增加而增强;当碳化钨含量在40%时,堆焊层的硬度和耐磨性能最强,初始碳化钨颗粒的沉淀和熔解并与铁基合金元素发生相互作用形成共晶组织、长条状沉淀物是增强耐磨性的原因。Wear is the main reason for a sharp subsoiler failure and results in huge loss of material. Plasma arc welding technology in subsoiler tip was obtained to increase wear resistance to extend the life. The different proportion WC of iron-based alloy powder, friction and wear performance in the field and influence of WC powder proportion of microstructure were studied. The results showed that the surfacing alloy layer thickness and had no cracks and other defects, and the coatings included dendrites and interdendritic eutectic diverse. In the same experimental conditions, the surfacing coating was significantly higher than normal wear sharp shovel and shovel with the sharp carbide, and wear of shovel increased with fraction of tungsten enhancing. When tungsten content 40%, the hardness and wear resistance of weld overla~ was the strongest, and the interaction of tungsten carbide precipitation and melting between particles and formation of eutectic alloy elements organization/strip precipitate was reason to enhance the wear resistance.

关 键 词：等离子堆焊 铁基-碳化钨合金 WC粉末比例 显微组织 

分 类 号：S232.9[农业科学—农业机械化工程]