熔铸工艺对铜钢双金属复合材料组织性能作用规律

Effects of Fusion-Casting Process Parameters on Microstructure and Properties of Copper-Steel Bimetallic Layered Composites

采用熔铸复合法制备了高铅青铜CuPb15Sn7/45钢双金属层状复合材料,研究了加热条件和冷却速率等工艺参数对铜钢复合界面和组织性能的影响规律。结果表明,当装炉温度为900℃,保温温度为1015℃,保温时间为5min并采用氮气冷却时,铜钢界面具有优异的冶金结合性能,界面拉伸断裂强度达到200MPa;铜合金区铅颗粒分布较均匀,铅元素烧损量低于1%;钢基体的组织和晶粒尺寸分布合理,表现出优异的熔铸复合效果。

The fusion-casting process was employed to prepare the high-lead bronze alloy CuPb15Sn7/45 steel bimetallic laminated composite.The effects of the process parameters such as heating condition and cooling rate on the microstructure and properties of copper-steel composite were investigated.The experimental results indicate that the copper-steel interface has excellent metallurgical bonding properties,and the tensile fracture strength of the interface reaches 200 MPa when the furnace loading temperature is 900℃,the holding temperature is 1015℃,the holding time is 5 min,and the nitrogen cooling is adopted.The distribution of lead particles in the copper alloy region is relatively uniform,and the lead element burning loss is less than 1%.The microstructure and grain size distribution of the steel matrix are also reasonable.It demonstrates the fusioncasting process could prepare high quality copper-steel bimetallic composite.