This study proposes a low-energy pulse current(LEPC)rapid solution treatment method,which can dis-solve more primaryγ'phase in a shorter time and effectively suppress abnormal grain growth,thereby successfully ac...This study proposes a low-energy pulse current(LEPC)rapid solution treatment method,which can dis-solve more primaryγ'phase in a shorter time and effectively suppress abnormal grain growth,thereby successfully achieving microstructure optimization and property enhancement.The microstructure anal-ysis showed that,compared with the 62.5%dissolution rate of the standard traditional solution treat-ment(1100℃/4 h),LEPC achieved an 88.9%dissolution of the primaryγ'phase in just 5 min at the same temperature.Furthermore,due to the rapidity of the LEPC treatment and its“targeted dissolution effect”on theγ'phase,excessivegrain growthwas effectivelysuppressed,resultingingrain sizecom-parable to those obtained with traditional solution treatment.Mechanical property testing indicated that the alloy treated with LEPC had a hardness of 531 HV at room temperature,while the yield strength,Ultimate strength,and maximum strain reached 994 MPa,1030 MPa,and 5.1%at the service tempera-ture(750℃).Compared to the standard traditional solution treatment,these properties were improved by 10.4%,11.1%,10.4%,and 17.5%,respectively.Finally,theoretical calculations revealed that the non-thermal effect of LEPC reduced the dissolution-free energy by approximately 49.4 kJ/mol and increased the diffusion coefficient by about 76 times,which was the fundamental reason for the accelerated disso-lution of the primaryγ’phase.展开更多
In oilfield fracturing construction, to solve the technical problems such as poor dissolution effect and long dissolution time of polymer drag reducer powder, the rheological regulator, phase transfer agent, organic s...In oilfield fracturing construction, to solve the technical problems such as poor dissolution effect and long dissolution time of polymer drag reducer powder, the rheological regulator, phase transfer agent, organic solvent, and drag reducer powder were compounded to prepare a drag reducer emulsion that was soluble in water. The stability of the drag reducer emulsion was observed at room temperature for 90 days. The effects of the rheological regulator, phase transfer agent, and organic solvent on the stability and solubility of the drag reducer emulsion were studied. The dissolution time, dissolution effect, viscosity of the aqueous solution, and drag reduction performance of the drag reducer emulsion were evaluated. The results show the stability rate of the drag reducer emulsion prepared by MOST-1 rheological regulator, BHJ-8 and BHJ-6 compound phase inversion agent, ethylene glycol ether and 120 - 140 mesh powder can reach 97% at room temperature for 90 days. Compared with the drag reducer powder, when the aqueous solution concentration is 0.1%, the dissolution time is only 28 s, the viscosity can be increased by 30%, and the drag reduction rate can be increased by up to 8%.展开更多
基金financially supported by the National Key R&D Program of China(Nos.2020YFA0714901 and 2020YFA0714904).
文摘This study proposes a low-energy pulse current(LEPC)rapid solution treatment method,which can dis-solve more primaryγ'phase in a shorter time and effectively suppress abnormal grain growth,thereby successfully achieving microstructure optimization and property enhancement.The microstructure anal-ysis showed that,compared with the 62.5%dissolution rate of the standard traditional solution treat-ment(1100℃/4 h),LEPC achieved an 88.9%dissolution of the primaryγ'phase in just 5 min at the same temperature.Furthermore,due to the rapidity of the LEPC treatment and its“targeted dissolution effect”on theγ'phase,excessivegrain growthwas effectivelysuppressed,resultingingrain sizecom-parable to those obtained with traditional solution treatment.Mechanical property testing indicated that the alloy treated with LEPC had a hardness of 531 HV at room temperature,while the yield strength,Ultimate strength,and maximum strain reached 994 MPa,1030 MPa,and 5.1%at the service tempera-ture(750℃).Compared to the standard traditional solution treatment,these properties were improved by 10.4%,11.1%,10.4%,and 17.5%,respectively.Finally,theoretical calculations revealed that the non-thermal effect of LEPC reduced the dissolution-free energy by approximately 49.4 kJ/mol and increased the diffusion coefficient by about 76 times,which was the fundamental reason for the accelerated disso-lution of the primaryγ’phase.
文摘In oilfield fracturing construction, to solve the technical problems such as poor dissolution effect and long dissolution time of polymer drag reducer powder, the rheological regulator, phase transfer agent, organic solvent, and drag reducer powder were compounded to prepare a drag reducer emulsion that was soluble in water. The stability of the drag reducer emulsion was observed at room temperature for 90 days. The effects of the rheological regulator, phase transfer agent, and organic solvent on the stability and solubility of the drag reducer emulsion were studied. The dissolution time, dissolution effect, viscosity of the aqueous solution, and drag reduction performance of the drag reducer emulsion were evaluated. The results show the stability rate of the drag reducer emulsion prepared by MOST-1 rheological regulator, BHJ-8 and BHJ-6 compound phase inversion agent, ethylene glycol ether and 120 - 140 mesh powder can reach 97% at room temperature for 90 days. Compared with the drag reducer powder, when the aqueous solution concentration is 0.1%, the dissolution time is only 28 s, the viscosity can be increased by 30%, and the drag reduction rate can be increased by up to 8%.
