High boron hardfacing alloys reinforced with primary M2B phases on Q235 steel plates were prepared by the method of flux-cored wire submerged arc welding. The microstructure and boride morphology were investigated usi...High boron hardfacing alloys reinforced with primary M2B phases on Q235 steel plates were prepared by the method of flux-cored wire submerged arc welding. The microstructure and boride morphology were investigated using optical microscopy （OM）, scanning electron microscopy （SEM） and X-ray diffraction （XRD）. The effect of WC/W2C on the microstructure was discussed. It indicated that the volume fraction of primary M2B phases has increased due to good nucleated cores of incompletely molten W2C particles provided by casting tungsten carbide or decarburizing reaction of WC powders. Abrasion resistance was evaluated by wet sand rubber wear tests and the wear mechanism was studied using SEM. It shows that primary M2B grains play a key role in improving abrasion resistance.展开更多
基金supported by the Natural Science Foundation of Hunan Province,China(No.10JJ6078)
文摘High boron hardfacing alloys reinforced with primary M2B phases on Q235 steel plates were prepared by the method of flux-cored wire submerged arc welding. The microstructure and boride morphology were investigated using optical microscopy （OM）, scanning electron microscopy （SEM） and X-ray diffraction （XRD）. The effect of WC/W2C on the microstructure was discussed. It indicated that the volume fraction of primary M2B phases has increased due to good nucleated cores of incompletely molten W2C particles provided by casting tungsten carbide or decarburizing reaction of WC powders. Abrasion resistance was evaluated by wet sand rubber wear tests and the wear mechanism was studied using SEM. It shows that primary M2B grains play a key role in improving abrasion resistance.
文摘研究了5CrMnMo 钢渗碳并经马氏体(M)与贝氏体(B)复相处理后的力学性能与冲击磨损机理。结果表明,冲击加滑动产生脱层磨损;渗碳后马氏体(M)/下贝氏体(B_下)组织中 B_下量增加,韧性塑性可明显提高,B_下量达到一定值时,其抗冲击磨损能力最高;无论是先 M后 B_下组织还是先 B_下后 M 组织,只要含有一定量的 B_下都能提高材料的韧性塑性和耐磨性,但先 B_下后 M 的组织性能更好。看来渗碳加 M 与 B_下复相处理可作为提高中碳钢冷作模具寿命的一条新的有效途径。
