Investigations on external separation layer defect of nickel-based superalloy in rotary tube piercing process

Zhang, Zhe; Liu, Dong; Li, Nan; Man, Tongchi; Wang, Jianguo; Pang, Yuhua; Yu, Yanlong

doi:10.1007/s00170-022-09320-y

Cited by 1 publication

(1 citation statement)

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“…With this aim, a finite element method (FEM) model of the CPE process was developed to analyze the deformation conditions, and experiments were performed afterward to conclude that the resulting bimodal structure is influenced by reduction rate and rolling speed. In a posterior study, the CPE of nickel alloys [25,26] was assessed by developing FEM simulations of the process. From the simulation results, a set of optimum process parameters to control the external separation layer defect in thick-walled tubes was proposed.…”

Section: Introductionmentioning

confidence: 99%

Microstructural and Mechanical Analysis of Seamless Pipes Made of Superaustenitic Stainless Steel Using Cross-Roll Piercing and Elongation

Murillo-Marrodán,

Gamin,

Kaputkina

et al. 2023

JMMP

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The cross-roll piercing and elongation (CPE) is a forming process performed at high temperatures and high strain rates. The final product quality is strongly dependent on its microstructure. In this study, a finite element method (FEM) model was developed to better understand plastic deformation effects on microstructure during CPE and to analyze alternative thermo-mechanical processing routes. Specific models were used to simulate dynamic and meta-dynamic recrystallization (DRX and MDRX) for the processing of superaustenitic stainless steel (SASS). In addition, the CPE of SASS was investigated experimentally. The microstructure, mechanical properties, and chemical changes of the final product were assessed using optical microscopy, hardness testing, X-ray diffraction, and SEM-EDS. The results revealed higher temperatures and strain rates in the exterior area of the shell after piercing, and MDRX occurred in the whole thickness. However, an average grain size reduction of 13.9% occurred only in the shell middle and inner diameters. During elongation, the highest values of the strain rate and DRX were observed in the inner region, exhibiting a grain size reduction of 38%. Spread in terms of grain size and grain shape anisotropy was found to be less accentuated for tube samples as compared to the pierced shells.

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Section: Introductionmentioning

confidence: 99%