Microstructure and fracture performance of 304 stainless steel laser repairs with Al2O3 nano-particles
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Yinyin Li
Abstract
Pre-cracked 304 stainless steel compact tension specimens were repaired by a CO2 laser at the crack tips with the addition of different weight fractions of nano-Al2O3. Crack opening displacements were measured by a digital image correlation system for the evaluation of fracture performance. Microstructures of the repaired areas were examined by scanning electron microscopy equipped with an energy dispersive spectrometer. Results indicated that laser repair with the addition of 1.0 wt.-% nano-Al2O3 resulted in metallurgical bonding at the interface and fine columnar crystal in the repair layer. The addition of nano-Al2O3 increases sites of heterogeneous nucleation, which acts as a fine-grain strengthener. In addition, the uniform distribution of nano-Al2O3 plays a role in dispersion strengthening, resulting in improved fracture performance by approximately 10 % to 30 % as applied loads varied from 1 to 20 kN. However, the excessive addition of nano-Al2O3 gives rise to the agglomeration and micro-cracks in the repair layers and clear detachment are observed at the interface.
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© 2019, Carl Hanser Verlag, München
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Artikel in diesem Heft
- Fachbeiträge/Technical Contributions
- Durability studies on vibration-loaded electrical contact systems subjected to tribological stress
- A new hybrid approach for reliability-based design optimization of structural components
- Investigation of the microstructure of dissimilar welds in duplex stainless steel and low alloyed steel
- Microstructure and fracture performance of 304 stainless steel laser repairs with Al2O3 nano-particles
- Wet corrosion behavior of copper exposed to recycled groundnut oil as biofuel
- Numerical and experimental performance evaluation of an innovatively manufactured centrifugal pump
- Effect of weld parameters on the microstructure and mechanical properties of dissimilar friction stir joints between pure copper and the aluminum alloy AA7075-T6
- Mechanical properties of waste mussel shell particles reinforced epoxy composites
- Effect of fiber length on the mechanical properties of banana fiber – vinyl ester composites
- Effect of rare earth elements on the microstructure and properties of a die-cast aluminum alloy
- Relationship between MnS precipitation and respective effects of Ti-Mg bearing inclusions on the induction of intergranular acicular ferrite
- Influence of graphene coating on altering the heat transfer behavior of microprocessors
- Microstructure and wear of FeCrC, SiC and B4C coated AISI 430 stainless steel
- Potentiometric studies on the influence of poly(N-vinylpyrrolidone) on the thermal degradation behavior of poly(vinyl chloride) blends
