A study of microstructures and mechanical properties of laser welded joint in GH3030 alloy

Zhan, Tao; Chai, Fang; Zhao, Juan; Yan, Fengyuan; Wang, Wei

doi:10.1007/s12206-018-0518-9

Cited by 8 publications

(4 citation statements)

References 16 publications

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“…The Ni-based superalloy in this investigation was GH3030 alloy, which was provided by Fushun special steel Co. Ltd (Fushun, China). At present, GH3030 alloy has attracted growing interest in the aerospace field, owing to the excellent oxidation resistance, high thermal strength, and good plasticity [15]. The nominal chemical composition of GH3030 alloy is listed in Table 1.…”

Section: Methodsmentioning

confidence: 99%

Static Recrystallization Microstructure Evolution in a Cold-Deformed Ni-Based Superalloy during Electropulsing Treatment

Zhang¹,

Zhang²,

Han³

et al. 2020

Crystals

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The influence of electropulsing treatment (EPT) parameters on the static recrystallization (SRX) microstructure in a cold-deformed Ni-based superalloy was investigated. During EPT, both the volume fraction of SRX grains and the average grain size increased with the increasing EPT temperature, which was attributed to the thermal effect and athermal effect induced by EPT. The mobility of SRX grain boundaries was promoted at the higher temperature due to the thermal effect, while the nucleation rate would be increased by EPT through decreasing the thermodynamic barrier. The formation of parallel dislocations caused by electron wind force could also play an indirect role in promoting SRX process. Moreover, the volume fraction of SRX grains increased significantly with the extension of EPT time at 700 °C, while the EPT time had a trivial effect on the average grain size. In addition, the sufficient deformation was essential to the occurrence of SRX behavior during EPT, and the localized Joule heating effect could promote the SRX behavior in the samples with the larger strains. Besides that, the influence of twining and carbides on the SRX behaviors was also investigated.

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Section: Methodsmentioning

confidence: 99%

Static Recrystallization Microstructure Evolution in a Cold-Deformed Ni-Based Superalloy during Electropulsing Treatment

Zhang¹,

Zhang²,

Han³

et al. 2020

Crystals

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“…The surface defects can be controlled by visual inspection, liquid penetrant examination, magnetic particle inspection and internal macro-defects can be examined by radiographic and ultrasonic testing techniques but the issue of the micro-defects persists. However due to affinity of the molten metal for the oxygen, the porosities in the welded joint cannot be eliminate completely [4]. The porosities of various shapes like circular, parallelogram and semicircular etc.…”

Section: Introductionmentioning

confidence: 99%

“…The porosities of various shapes like circular, parallelogram and semicircular etc. with size up-to 1 μm have observed by many researchers in the deposited weld metals [4] [5] [6]. Choong and his colleague [7] studied the effect of different heat inputs on the API-65 grade alloy welded by high frequency electric resistance welding and examined the chemical composition of welded area and concluded that oxides could not be squeeze out, resulting in the defects.…”

Section: Introductionmentioning

confidence: 99%

Selection of Joint Preparation Procedure based on Cost-effectiveness and Defects analysis of Double-V SMAW Joint

Khan,

Qayyum,

Wakeel

et al. 2023

IJANSER

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Double sided shielded metal arc welded joint has wide applications in fabrication sector for production of critical joints but the root pass in those joint leads to many defects, mainly due to the sudden cooling because the adjacent base material is at room temperature in the start of welding and compromises the quality of the weldments. In the fabrication industry, root pass removal is a routine practice for producing quality joints using grinding and air carbon arc gouging. In this research, comparative study of cost-effectiveness and defects analysis of the above root pass removal procedures have applied to the double-v mild steel shielded metal arc welded joint for the selection of better procedure. For cost calculation of joints, labor cost (LC), energy cost (EC), material cost (MC) and overhead cost taken into account and defects examined by the visual inspection, liquid penetrant test, radiographic test and optical microscope. The results showed overall 4.7% lower cost and enhanced quality in terms of macro/micro-defects for ground joint. The major contribution to the lower cost of ground joint has given by the consumables and energy but in defects analysis, only width difference in both sides’ reinforcement i.e., front and back have observed for gouged joint and relatively more numbers of micro-defects.

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“…Nickel-based superalloys have been widely used in heated end components of aviation and aerospace engineering with advantages of high strength and toughness in elevated temperature, good oxidation resistance, excellent thermal stability, and fatigue properties [1][2][3]. However, nickel-based superalloys are hard to machine due to the low thermal conductivity and high temperature strength [4,5], which could cause poor surface quality, serious tool wear, and low productivity in traditional machining [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Study on Ultrasonic Assisted Electrochemical Drill-Grinding of Superalloy

et al. 2020

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Electrochemical grinding (ECG) technique composed of electrochemical machining (ECM) and mechanical grinding is a proper method for machining of difficult-to-cut alloys. This paper presents a new ultrasonic assisted electrochemical drill-grinding (UAECDG) technique which combines electrochemical drilling, mechanical grinding, and ultrasonic vibration to fabricating high-quality small holes on superalloy. By applying ultrasonic vibration to high-speed rotating electrode in ECG, machining stability, efficiency, and surface quality can be obviously improved. Firstly, the electrochemical passive behavior of superalloy is studied, the mathematical model and simulation of gap electric field are established. Then, several experiments are conducted to investigate the influence of applied voltage, feed rate and ultrasonic amplitude on the machining quality. The balance of material removal between electrochemical reaction and mechanical grinding is achieved by optimizing the machining parameters. It reveals that the surface quality as well as machining stability and efficiency can be significantly improved by applying rotating ultrasonic vibration to the ECG process. Finally, several small holes of high quality have been machined successfully along with surface roughness of hole sidewall decreases from Ra 0.99 μm to Ra 0.14 μm by UAECDG.

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A study of microstructures and mechanical properties of laser welded joint in GH3030 alloy

Cited by 8 publications

References 16 publications

Static Recrystallization Microstructure Evolution in a Cold-Deformed Ni-Based Superalloy during Electropulsing Treatment

Static Recrystallization Microstructure Evolution in a Cold-Deformed Ni-Based Superalloy during Electropulsing Treatment

Selection of Joint Preparation Procedure based on Cost-effectiveness and Defects analysis of Double-V SMAW Joint

Study on Ultrasonic Assisted Electrochemical Drill-Grinding of Superalloy

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