Additive manufacturing of steel-copper functionally graded material with ultrahigh bonding strength

• 作者: Chaolin Tan Youxiang Chew Guijun Bi Di Wang Wenyou Ma Yongqiang Yang Kesong Zhou
• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2021,（13）
• 页码范围: 217-222
• 页数: 6页
• 语种: 英文

摘要

Additive manufacturing enables processing of functionally graded materials (FGMs) with flexible spatial design and high bonding strength.A steel-copper FGM with high interfacial strength was developed using laser powder bed fusion (LPBF).The effect of laser process parameters on interfacial defects was evaluated by X-ray tomography,which indicates a low porosity level of 0.042 ％ therein.Gradient/fine dendritic grains in the interface are incited by high cooling rates,which facilitates interface strengthening.Multiple mechanical tests evaluate the bonding reliability of interface;and the fatigue tests further substantiate the ultrahigh bonding strength in FGMs,which is superior to traditional manufacturing methods.Mechanisms of the high interfacial bond strength were also discussed.