The effects of solid-state phase transformation upon stress evolution in laser metal powder deposition

Fang, Jinxiang; Dong, Shiyun; Wang, Y.J.; Xu, Bin; Zhang, Z.H.; Xia, Da-Hai; He, Peng

doi:10.1016/j.matdes.2015.08.061

Cited by 55 publications

(17 citation statements)

References 31 publications

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“…Nonetheless, when the phase transition is ignored (Figure 18a), the residual stresses in the cladding bead increase obviously, which are near the yield strength; the maximum tensile stress is found in the interface between the substrate and the clad layer. When phase transition is taken into account, the cases with and without considering the stress effect on phase transition temperature (Figure 18c and d, respectively) show a similar residual stress level and distribution [25]. Figure 18.…”

Section: Residual Stress Analysis On Welded Joints By Means Of Numerimentioning

confidence: 80%

“…However, the actual situation is complex and still has some work to be done [25]. Firstly, the coupling interaction is very complicated since the stress has a great effect on the phase transition temperature and phase transition kinetics, which in turn affects the evolution of stress.…”

Section: Residual Stress Analysis Of High-strength Steel Pieces Remanmentioning

confidence: 99%

“…Then, many work lacks systematic and reliable physical data, especially computer simulation, in which the systematic and reliability of the data is a very important factor. Moreover, the research results are mostly limited to the welding process [25,26].…”

Section: Residual Stress Analysis Of High-strength Steel Pieces Remanmentioning

confidence: 99%

“…The emissivity (ε) is defined to be 0.5, and the convection coefficient (h c ) is 30 W/m 2 K. Initial temperature is set at 25 C (room temperature). Finally, the deposition process is regarded as quasi-steady process, and the materials are assumed isotropic [25].…”

Section: à4mentioning

confidence: 99%

See 3 more Smart Citations

Residual Stress Analysis of Laser Remanufacturing

Dong¹,

Song²,

Xiangyi³

et al. 2018

Residual Stress Analysis on Welded Joints by Means of Numerical Simulation and Experiments

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Laser remanufacturing is an advanced repairing method to remanufacture damaged parts based on laser processing, such as laser cladding and laser welding. As a critical factor in determining the remanufacturing quality, residual stress of different laserremanufactured parts was analysed by numerical methods based on deactivating and reactivating element theory, as well as experimental methods such as X-ray diffraction and hole drilling measurements. The distributions and evolution law of residual stress during multipass laser welding of 7A52 high-strength aluminium alloy, and the effects of forming strategy, heat input and solid-state phase transition on residual stress in the laser cladding forming layers of QT 500 cast iron and FV520B high strength steel, were emphatically studied. The simulation results of residual stress fit well with the experimental results, indicating that both residual stress and its accumulation phenomenon would occur during the laser welding and laser cladding forming, and were affected by factors such as welding pass, heat input and phase transition. It is feasible to control residual stress by using cross path forming strategy, less heat input and alloying power materials with low martensite transition point (Ms).

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Section: Residual Stress Analysis On Welded Joints By Means Of Numerimentioning

confidence: 80%

Section: Residual Stress Analysis Of High-strength Steel Pieces Remanmentioning

confidence: 99%

Section: Residual Stress Analysis Of High-strength Steel Pieces Remanmentioning

confidence: 99%

Section: à4mentioning

confidence: 99%

See 2 more Smart Citations

Residual Stress Analysis of Laser Remanufacturing

Dong¹,

Song²,

Xiangyi³

et al. 2018

Residual Stress Analysis on Welded Joints by Means of Numerical Simulation and Experiments

View full text Add to dashboard Cite

show abstract

“…The existing research on the uncertainty of remanufactured parts shows that, due to the influence of different degrees of the thermal field and stress field in the remanufacturing repair process, the shape, hardness, strength and toughness of the remanufactured parts has appeared in the gradient of the tissue or the gradient of the performance [3,4]. Liu [5] considered that there is a greater degree of variance of the components, and there is a higher uncertainty with respect to the new parts, and the mathematical model of uncertainty measurement is established.…”

Section: Introductionmentioning

confidence: 99%

Tolerance Redistributing of the Reassembly Dimensional Chain on Measure of Uncertainty

Liu

2016

Entropy

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How to use the limited precision of remanufactured parts to assemble higher-quality remanufactured products is a challenge for remanufacturing engineering under uncertainty. On the basis of analyzing the uncertainty of remanufacturing parts, this paper takes tolerance redistributing of the reassembly (remanufactured assembly) dimensional chain as the research object. An entropy model to measure the uncertainty of assembly dimensional is built, and we quantify the degree of the uncertainty gap between reassembly and assembly. Then, in order to make sure the uncertainty of reassembly is not lower than that of assembly, the tolerance redistribution optimization model of the reassembly dimensional chain is proposed which is based on the tolerance of the grading allocation method. Finally, this paper takes the remanufactured gearbox assembly dimension chain as an example. The redistribution optimization model saves 19.11% of the cost with the assembly precision of remanufactured products. It provides new technical and theoretical support to expand the utilization rate of remanufactured parts and improve reassembly precision.

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Thermal Behavior and Densification Mechanism during Selective Laser Melting Additive Manufacturing of Metal Powder

Duan

Zhao

Luo

2020

steel research int.

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Herein, based on the ABAQUS commercial finite‐element analysis (FEA) software, a set of user subroutines is designed, and then a 3D FEA model is proposed to systematically and quantitatively investigate the effects of laser processing parameters on the evolution of molten pool structure and complicated thermal behavior during the selective laser melting (SLM) additive manufacturing of H13 die steel. The SLM experiments are conducted to verify the accuracy and reliability of simulation and reveal the densification behavior of SLM‐fabricated H13 die steel parts. The underlying thermal mechanism is revealed, and the relationship among laser processing parameters, thermal behavior, and densification is established. It is found that the densification behavior is highly sensitive to the applied volume energy density (VED). The densification level is effectively controlled by adjusting VED, hence obtaining the parts with excellent performance. The SLM‐fabricated specimens with nearly full dense cross sections are obtained, as the applied VED increases to 111 J mm−3. Research results found herein lie a foundation for the actual SLM processing of H13 die steel and provide a theoretical basis and technical support for the laser rapid prototyping of other die steels or even complete die parts.

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The effects of solid-state phase transformation upon stress evolution in laser metal powder deposition

Cited by 55 publications

References 31 publications

Residual Stress Analysis of Laser Remanufacturing

Residual Stress Analysis of Laser Remanufacturing

Tolerance Redistributing of the Reassembly Dimensional Chain on Measure of Uncertainty

Thermal Behavior and Densification Mechanism during Selective Laser Melting Additive Manufacturing of Metal Powder

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