大面积耐磨合金堆焊层表面成形改善及其性能的研究

Modification of the Appearance of Weld in Bulkweld Hardfacing and Its Properties

在大面积耐磨复层板的堆焊工艺中针对以普通铬铁为外填充合金粉末,在A3板上堆焊耐磨层时,其表面成形较差的问题,设计了向合金粉末中分别加入硅、硼及联合加入硅、硼时的堆焊实验。经观察堆焊层表面成形情况、硬度测试及显微分析,结果表明:加入适量的硅、硼能有效地改善堆焊层的表面成形,提高堆焊层的硬度;加入硼铁后,基体组织中在空冷条件下就有马氏体析出,因而提高了堆焊层的淬透性。

Bulkwelding is often applied to hardfacing low carbon steels with a wear resistant alloy layer The purpose of this work is to improve the appearance of weld of this process. The results of surfacing test indicate that the appearance and hardness of the weld can be improved efficiently by adding silion and boron into alloy powder. The martensite will be formed by adding boron during the cooling process, which could increase the quenching degree . These hardfacings derive their abrasion resistance from a microstructure consisting of a dispersion of M7C3 carbides. The more dispersed the M7C3 carbides are, the higher hardness the deposit will reach.