氧化镧对履带堆焊层合金微观组织与耐磨性的影响

发布时间：2018-12-28 17:39

【摘要】：目的研制一种新型含氧化镧(La_2O_3)堆焊装甲车履带用药芯焊丝,通过细化堆焊层合金的微观组织,提高堆焊层合金的耐磨性。方法采用堆焊的方法制作堆焊层合金,采用金相显微镜观察了其表面显微组织,并测定了其表面洛氏硬度和耐磨性。结果堆焊层合金微观组织由粒状贝氏体、马氏体和残余奥氏体组成。未加氧化镧的堆焊层合金初生奥氏体晶粒粗大,其平均尺寸在42μm,耐磨性为6000 min/g;当药芯焊丝中加入质量分数为2.5%的氧化镧之后,堆焊层合金的奥氏体晶粒尺寸最小,其平均尺寸为36μm,耐磨性为12 300 min/g。铝酸镧(LaAlO_3)的(001)面与奥氏体(100)面之间的二维错配度为3.81%。结论铝酸镧作为γ-Fe的异质形核核心最有效,说明堆焊层合金中铝酸镧可以使初生奥氏体的晶粒尺寸得到细化,从而改善了履带堆焊层合金的耐磨性。
[Abstract]:Aim to develop a new type of lanthanum oxide (La_2O_3) surfacing metal cored wire for track of armored vehicle. By refining the microstructure of surfacing layer alloy, the wear resistance of surfacing layer alloy is improved. Methods the surfacing alloy was made by surfacing welding. The surface microstructure was observed by metallographic microscope and the Rockwell hardness and wear resistance were measured. Results the microstructure of the surfacing alloy consists of granular bainite, martensite and retained austenite. The primary austenite grain of the surfacing alloy without lanthanum oxide is coarse, its average size is 42 渭 m, and the wear resistance is 6000 min/g;. When 2.5% lanthanum oxide was added into the flux-cored wire, the austenite grain size of the surfacing alloy was the smallest, with an average size of 36 渭 m and wear resistance of 12 300 min/g.. The two dimensional mismatch between the (001) and austenite surfaces of LaAlO_3 is 3.81. Conclusion Lanthanum aluminate is the most effective heterogeneous nucleation core of 纬-Fe, which indicates that lanthanum aluminate can refine the grain size of primary austenite in surfacing alloy and improve the wear resistance of track surfacing alloy.
【作者单位】：中国兵器工业集团内蒙古第一机械集团有限公司;燕山大学极端条件下机械结构与科学国防重点学科实验室;
【基金】：国家自然科学基金(51471148)~~
【分类号】：TG455

【相似文献】