Abstract

Iron-based alloy coatings were deposited on grey cast iron through plasma transfer arc welding. Results showed that the iron-based alloy coatings are composed of pearlite, martensite, austenite, and secondary carbides. There formed a bonding transformation layer between coating and grey cast iron with the width of about 205 μm. The optimized plasma transfer arc current was 100 A with the coating’s microhardness of 749 Hv. Meanwhile, the bonding strength between the deposit and the grey cast iron was 208 MPa which was comparable to the grey cast iron’s strength. The thick coatings with similar properties to the grey cast iron formed the basis of remanufacturing grey cast iron parts.

摘要

通过等离子转移电弧焊在灰口铸铁上沉积铁基合金涂层。结果表明，铁基合金镀层由珠光体、马氏体、奥氏体和二次碳化物组成。涂层与灰口铸铁之间形成了一个宽度约为205 μm的结合转变层。优化的等离子转移电弧电流为 100 A，涂层的显微硬度为 749 Hv。同时，沉积物与灰铸铁之间的结合强度为208 MPa，与灰铸铁的强度相当。与灰铸铁性能相似的厚涂层构成了灰铸铁零件再制造的基础。