Sulphur segregation and precipitation in HAZ of boiler steel thick section welds

被引:3
|
作者
Chappuis, A. Ghazanchyan [1 ]
Davis, C. L. [1 ]
机构
[1] Univ Birmingham, Dept Met & Mat, Birmingham B15 2TT, W Midlands, England
关键词
sulphur segregation; precipitation; steel; weld HAZ; PWHT; stress relief cracking;
D O I
10.1179/174328406X102417
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Stress relief cracking can occur in weld heat affected zones (HAZ) after post-weld heat treatment (PWHT) and periods of service at elevated temperatures. Stress relief cracking is generally believed to occur by sulphur induced decohesion ahead of a growing sharp crack. The impurity segregation behaviour in a microalloyed steel, typical of that used in the construction of a power station boiler where intermittent cracks were observed along the weld fusion boundaries, has been assessed. In particular the type and amount of segregation in the coarse grained HAZ (CGHAZ) before and after PWHT has been determined. It was found that significant sulphur segregation occurred during the CGHAZ thermal cycle resulting in elemental sulphur on the prior austenite grain boundaries. Following PWHT some desegregation of sulphur, coupled with the formation of sulphides and carbides on the prior austenite grain boundaries, was observed; in addition, significant phosphorus segregation to the prior austenite grain boundaries and grain boundary precipitate/matrix interfaces was seen.
引用
收藏
页码:937 / 943
页数:7
相关论文
共 50 条
  • [1] BOROCARBIDE PRECIPITATION IN HAZ OF BORON STEEL WELDS
    DEVLETIAN, JH
    [J]. WELDING JOURNAL, 1976, 55 (01) : S5 - S12
  • [2] Residual stresses in high strength, thick section steel welds
    Pearce, S. V.
    Linton, V. M.
    [J]. STRESS EVALUATION IN MATERIALS USING NEUTRONS AND SYNCHROTRON RADIATION, 2008, 571-572 : 387 - 392
  • [3] Measurement and prediction of residual stresses in a thick section steel welds
    Smith, DJ
    George, D
    Bouchard, PJ
    Watson, C
    [J]. RECENT ADVANCES IN WELDING SIMULATION, 2000, 2000 (13): : 55 - 78
  • [4] Measurement and prediction of residual stresses in thick-section steel welds
    Smith, DJ
    Bouchard, PJ
    George, D
    [J]. JOURNAL OF STRAIN ANALYSIS FOR ENGINEERING DESIGN, 2000, 35 (04): : 287 - 305
  • [5] MEASUREMENT OF RESIDUAL STRESSES IN THICK SECTION STEEL ELECTRON BEAM WELDS
    Kingston, E.
    Smith, D. J.
    Zheng, G.
    Gill, C.
    Hurrell, P.
    [J]. PROCEEDINGS OF THE ASME PRESSURE VESSELS AND PIPING CONFERENCE 2010, VOL 6, PTS A AND B, 2010, : 1307 - 1316
  • [6] Fracture toughness of simulated HAZ in HSLA steel welds
    Lambert, A
    Gourgues, AF
    Sturel, T
    Pineau, A
    [J]. ADVANCES IN MECHANICAL BEHAVIOUR, PLASTICITY AND DAMAGE, VOLS 1 AND 2, PROCEEDINGS, 2000, : 97 - 102
  • [7] The reliability of radiography of thick section welds
    Munns, IJ
    Schneider, CRA
    [J]. REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLS 19A AND 19B, 2000, 509 : 2151 - 2158
  • [8] Micromechanisms of cleavage fracture in HAZ of low carbon steel welds
    Moya-Gutiérrez, C
    Ocaña-Arizcorreta, I
    Martín-Meizoso, A
    [J]. MATERIALS STRUCTURE & MICROMECHANICS OF FRACTURE IV, 2005, 482 : 175 - 178
  • [9] ELECTRON-BEAM WELDING THICK SECTION PRECIPITATION-HARDENING STEEL
    TURNER, AJ
    [J]. WELDING JOURNAL, 1981, 60 (01) : 18 - 26
  • [10] Microstructural characterization of the HAZ in AISI 444 ferritic stainless steel welds
    Silva, Cleiton C.
    Farias, Jesualdo P.
    Miranda, Helio C.
    Guimaraes, Rodrigo F.
    Menezes, John W. A.
    Neto, Moises A. M.
    [J]. MATERIALS CHARACTERIZATION, 2008, 59 (05) : 528 - 533