【摘 要】
：
The residual stress evolution in a safe-end/nozzle dissimilar metal welded joint of CAP1400 nuclear power plants was investigated in the manufacturing process by finite element simulation.A finite element model,including cladding,buttering,post-weld heat
【机 构】
：
Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research, Chinese Acade
论文部分内容阅读
The residual stress evolution in a safe-end/nozzle dissimilar metal welded joint of CAP1400 nuclear power plants was investigated in the manufacturing process by finite element simulation.A finite element model,including cladding,buttering,post-weld heat treatment (PWHT) and dissimilar metal multi-pass welding,is developed based on SYSWELD software to investigate the evolution of residual stress in the aforementioned manufacturing process.The results reveal a large tensile axial residual stress,which exists at the weld zone on the inner surface,leads to a high sensitivity to stress corrosion cracking (SCC).PWHT process before dissimilar metal multi-pass welding process has a great influence on the magnitude and distribution of final axial residual stress.The risk of SCC on the inner surface of the pipe will increase if PWHT process is not taken into account.Therefore,such crucial thermal manufacturing process such as cladding,buttering and post-weld heat treatment,besides the multi-pass welding process,should be considered in the numerical model in order to accurately predict the distribution and the magnitude of the residual stress.
其他文献
The surface of AISI 1045 steel specimens was modified via two duplex surface treatments of (i) titanium diffusion coating followed by plasma nitriding (Ti-PN) and (ii) plasma nitriding followed by titanium diffusion coating (PN-Ti).A comparative study on
Type I hot corrosion behavior of SiO2-Al2O3-glass composite coating based on Ti-47Al-2Cr-2Nb substrate was investigated in the mixture salt of 25 wt％NaCl + 75 wt％Na2SO4 at 850 ℃.The results showed that there was a bidirectional ion exchange between compos
Mg-Zn-Zr series Mg alloys (ZK) are one of the most important commercial Mg alloys due to their good comprehensive mechanical properties.The phase equilibria of the Mg-Zn-Zr system at 400 ℃ covering the overall composition range were investigated by X-ray
In the present study,a quenching treatment prior to two-stage heat treatment was conducted on a Fe-0.28C-1.55Mn-2.06Al transformation-induced plasticity steel to tailor the final microstructure.Compared with the microstructure of the ferrite,bainite and b
The damage behaviors of a titanium matrix composite shaft under torsion loading were monitored using the acoustic emission technique.The composite shaft with SiC fibers at ± 45° orientations was prepared by the solid-state fabrication process.Both the tor
Ni-based self-lubricating composites containing a fixed amount of hexagonal boron nitride (h-BN) (5 wt％) and different amounts of graphene (0-1.5 wt％) were prepared by ultrasonic dispersion,high-energy ball milling,and spark plasma sintering.The effects o
The corrosion behavior of high-strength steel used for flexible riser exposed to CO2-saturated saline solution and CO2-saturated vapor environments was studied through immersion experiment and electrochemical corrosion experiment.The corrosion behavior an
The effect of hot isostatic pressing (HIP) treatment on the fatigue notch sensitivity of Ti-6Al-4V alloy fabricated by electron beam melting (EBM) was investigated.The results indicate that the fatigue notch sensitivity of the as-fabricated samples is muc
Porous titanium scaffold with suitable porous architecture exhibits enormous potentials for bone defect repairs.However,insufficient osteointegration and osteoinduction still remain to open as one of the major problems to achieve satisfactory therapeutic
The study conveys an idea to enhance the osseointegration of titanium implant (Ti) through modulating macrophages M2 polarization.The ～ 100 nm spherical mesoporous silica nanoparticles (MSN) that compromised of ～ 4-nm-diameter nanotunnels were synthesized