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利用研究室自主研发的电弧微铸轧复合增材制造系统,无模直接成形出熔铸成形性和可焊性极低的45钢大壁厚差高强度零件,并在自由熔积和微铸轧复合两种工艺条件下进行对比试验,分析测试了45钢试样的组织特征和力学性能。结果表明:与自由熔积成形相比,微铸轧复合工艺将晶粒粒度由5.5级细化至12.0级,抗拉强度提高31.3%,屈服强度提高68.8%,平均硬度提高10.9%;与熔模铸造相比,微铸轧复合工艺将抗拉强度提高58.4%,屈服强度提高107.7%。因此,微铸轧复合增材制造技术将为难成形加工材料高强韧金属零件的低成本优质短流程制造提供一条有效途径。
Using the self-developed arc micro-casting compound additive manufacturing system researched and developed by the research laboratory, the 45 steel large wall thickness difference high strength parts with no weldability and low weldability are directly formed without any mold. Composite under the conditions of two comparative tests were carried out, analysis and testing of 45 steel samples of the organizational characteristics and mechanical properties. The results show that the grain size of the alloy is refined from 5.5 to 12.0, the tensile strength increases 31.3%, the yield strength increases 68.8% and the average hardness increases 10.9% Compared with die-casting, the micro-casting and rolling process increases the tensile strength by 58.4% and the yield strength by 107.7%. Therefore, the micro-casting compounding additive manufacturing technology will be difficult for forming high-toughness metal parts processing of low-cost high-quality short-run to provide an effective way.