skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Simulation And Experimental Results Of The Hot Metal Gas Forming Technology For High Strength Steel And Stainless Steel Tubes Forming

Abstract

Simulation is a key topic within the development of the H lowbar ot M lowbar etal G lowbar as F lowbar orming (HMGF) technology. In this work, tube bulge tests and tubes forming processes using dies were simulated at high temperatures by means of FEM. The tube deformations calculated by the numerical simulations were compared to the results from experiments carried out at different heating conditions and using different input pressure curves. Flow curves for several stainless and high strength steels were experimentally determined in order to be used for the simulation code. Ferritic stainless steel 1.4512 showed very high formability capabilities at high temperatures. During tube bulge tests of the ferritic steel a maximum expansion of tube diameter up to 55% was reached by using a pressure of only 14 bars.

Authors:
; ; ; ;  [1];  [2]
  1. Labein-Tecnalia, Edificio 700, C/ Geldo, Parque Tecnologico de Bizkaia, E-48160 Derio (Spain)
  2. Deparment of Ferrous Metallurgy, RWTH Aachen University, Intzestr. 1, DE-52072-Aachen (Germany)
Publication Date:
OSTI Identifier:
21057348
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 908; Journal Issue: 1; Conference: NUMIFORM '07: 9. international conference on numerical methods in industrial forming processes, Porto (Portugal), 17-21 Jun 2007; Other Information: DOI: 10.1063/1.2740973; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; DEFORMATION; FERRITIC STEELS; FINITE ELEMENT METHOD; HEATING; MATERIALS WORKING; METALS; STAINLESS STEELS; TEMPERATURE DEPENDENCE; TESTING; TUBES

Citation Formats

Vadillo, L., Santos, M. T., Gutierrez, M. A., Perez, I., Gonzalez, B., and Uthaisangsuk, V. Simulation And Experimental Results Of The Hot Metal Gas Forming Technology For High Strength Steel And Stainless Steel Tubes Forming. United States: N. p., 2007. Web. doi:10.1063/1.2740973.
Vadillo, L., Santos, M. T., Gutierrez, M. A., Perez, I., Gonzalez, B., & Uthaisangsuk, V. Simulation And Experimental Results Of The Hot Metal Gas Forming Technology For High Strength Steel And Stainless Steel Tubes Forming. United States. doi:10.1063/1.2740973.
Vadillo, L., Santos, M. T., Gutierrez, M. A., Perez, I., Gonzalez, B., and Uthaisangsuk, V. Thu . "Simulation And Experimental Results Of The Hot Metal Gas Forming Technology For High Strength Steel And Stainless Steel Tubes Forming". United States. doi:10.1063/1.2740973.
@article{osti_21057348,
title = {Simulation And Experimental Results Of The Hot Metal Gas Forming Technology For High Strength Steel And Stainless Steel Tubes Forming},
author = {Vadillo, L. and Santos, M. T. and Gutierrez, M. A. and Perez, I. and Gonzalez, B. and Uthaisangsuk, V.},
abstractNote = {Simulation is a key topic within the development of the H lowbar ot M lowbar etal G lowbar as F lowbar orming (HMGF) technology. In this work, tube bulge tests and tubes forming processes using dies were simulated at high temperatures by means of FEM. The tube deformations calculated by the numerical simulations were compared to the results from experiments carried out at different heating conditions and using different input pressure curves. Flow curves for several stainless and high strength steels were experimentally determined in order to be used for the simulation code. Ferritic stainless steel 1.4512 showed very high formability capabilities at high temperatures. During tube bulge tests of the ferritic steel a maximum expansion of tube diameter up to 55% was reached by using a pressure of only 14 bars.},
doi = {10.1063/1.2740973},
journal = {AIP Conference Proceedings},
number = 1,
volume = 908,
place = {United States},
year = {Thu May 17 00:00:00 EDT 2007},
month = {Thu May 17 00:00:00 EDT 2007}
}
  • Tube cold drawing processes are used to reduce tube diameters and thickness, while pulling them through a conical converging die with or without inner plug. An accurate modelling of the material deformation and friction behaviour is required in order to well describe these processes.The study concerns a stainless steel platinum alloy. The material behaviour is characterised through tensile tests at strain rates as close as possible to the high strain rates reached during the drawing process. The results are fitted with an isotropic temperature-independent Johnson Cook constitutive equation. The modelling of floating plug drawing is performed on a ABAQUS/Explicit model.more » Friction coefficient is difficult to estimate with mechanical experimental tests, thus an inverse analysis is carried out to fit this parameter thanks to finite element simulation and experimental drawing tests. Drawing force measurements are recorded during the forming process. The Cockroft-Latham criterion is applied to understand the different process parameters influence on tube drawing and its accuracy for drawing process is evaluated.« less
  • Special features of the structure and properties of the metal of centrifugally cast large-diameter tubes from steel 15Kh1M1F used in hot reheat steam conduits of high-power generating units are discussed. The metal of the tubes in the initial state is shown to possess structural heterogeneity primarily represented by segregation bands. The segregation bands are responsible for scattering of the mechanical properties and a 5 - 10% decrease in the long-term strength in the initial condition. The decline of the long-term strength intensifies with the propagation of the segregation over the cross section of the tubes. The segregation lowers the stabilitymore » of the structure and properties of the tubes in operation at a high level of long-term plasticity. By reducing the degree of segregation in centrifugally cast tubes the time of their operation in steam conduits can be increased to 200,000 h.« less
  • This paper reports the development of an austenitic stainless steel for sour-gas service. The new steel has been shown to offer high strength, i.e., 0.2% PS exceeding 42 kgf/mm{sup 2} (414 MPa) under solution-annealed conditions, along with excellent resistance to sulfide stress corrosion cracking, pitting corrosion, and crevice corrosion, in comparison with conventional martensitic stainless steels such as CA-6NM, duplex stainless steels such as ASTM A790 (UNS S31803), and austenitic stainless steels such as type 316 (UNS S31600). Its higher resistance to corrosion cracking, etc., than type 316 was thought to be attributable to the higher contents of Cr, Mo,more » and N, which help to form more stable passive film in a shorter time.« less
  • Shear operation is widely used as the first step in sheet metal forming to cut the sheet or plate into the required size. The shear of thick hot-rolled High Strength Steel (HSS) requires large shearing force and the sheared edge quality is relatively poor because of the large thickness and high strength compared with the traditional low carbon steel. Bad sheared edge quality will easily lead to edge cracking during the post-forming process. This study investigates the shearing process of thick hot-rolled HSS plate metal, which is generally exploited as the beam of heavy trucks. The Modified Mohr-Coulomb fracture criterionmore » (MMC) is employed in numerical simulation to calculate the initiation and propagation of cracks during the process evolution. Tensile specimens are designed to obtain various stress states in tension. Equivalent fracture strains are measured with Digital Image Correlation (DIC) equipment to constitute the fracture locus. Simulation of the tension test is carried out to check the fracture model. Then the MMC model is applied to the simulation of the shearing process, and the simulation results show that the MMC model predicts the ductile fracture successfully.« less
  • Laboratory tests in simulated sour downhole environments show correlation with field experience for these alloys.