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采用自制的低碳Ti、B微合金化金属芯焊丝进行了金属零件的堆焊快速成形试验,研究了成形件的组织特征和显微硬度,结果表明:沿沉积高度方向上,成形件的连续组织具有分层特征,珠光体的含量逐渐减少,铁素体的含量逐渐增加,表层主要为块状铁素体,这与成形件各区域的热循环条件和基板材料中C元素的扩散有关;成形件底部和中间区域的显微硬度显著高于表层区域的显微硬度。采用纳米压痕法研究了成形件组织中针状铁素体和块状铁素体的微观力学性能,结果表明:针状铁素体的硬度是块状铁素体的1.28倍,两者的弹性模量相当。因此,获得大量的针状铁素体组织是提高成形件力学性能的重要途径。
The self-made low-carbon Ti, B microalloyed metal-cored wire was used for rapid forming test of the metal parts. The microstructure and microhardness of the formed parts were studied. The results show that the continuous Tissue has a hierarchical structure, pearlite content gradually reduced, the content of ferrite gradually increased, the surface of the main bulk ferrite, which is forming the various regions of the thermal cycling conditions and substrate material C element diffusion related; The microhardness of the forming part at the bottom and the middle area is significantly higher than the microhardness of the surface area. The mechanical properties of acicular ferrite and massive ferrite in the formed part were studied by nanoindentation method. The results show that the acicular ferrite has a hardness of 1.28 times that of massive ferrite, Elastic modulus quite. Therefore, to obtain a large number of acicular ferrite is an important way to improve the mechanical properties of the formed parts.