Modification the weld metal structure of hsla steels by refractory nanoparticles

Authors

  • V. А. Kоstin Department of physical and chemical methods of research materials, PWI, st. Bozenko, 11, 03680, Кiev-150, Ukraine, Ukraine
  • G. І. Grigorenko Department of physical and chemical methods of research materials, PWI, st. Bozenko, 11, 03680, Кiev-150, Ukraine, Ukraine
  • V. V. Zukov Department of physical and chemical methods of research materials, PWI, st. Bozenko, 11, 03680, Кiev-150, Ukraine, Ukraine

Keywords:

arc welding, the weld metal ingot, nanopowder inoculators, decomposition of austenite, microstructur.

Abstract

Purpose. The aim of study was to investigate the impact of nano-dispersed particles of refractory metals in the molten metal of the weld pool and the crystallization kinetics of austenite in the metal joints of high-strength low-alloy steels. The results of studies of the metal structure of high-strength low-alloy steel joints 14HGNDTS, which were introduced into the melt. Nanopowder particles of various refractory compounds - oxides, nitrides and carbides (TiC, TiN, SiC, VC, NbC, TiO2, Al2O3, MgO, ZrO2). The studies  showed  the  effectiveness  of  nanooxides  TiO2  titanium  and  zirconium  ZrO2,  thus  ensuring  high  values  of  the  mechanical properties  of  the  weld  metal  (Rm -708  MPa  and 621MPa,  KCV-20 - 60  J /  cm2  and 72.9  J /  cm  2,  δ - 21  and 19%), due  to  the formation  of  the  complex  and  needle  bainitic  structures.  Using  Gleeble  3800  installation  simulating  thermal  cycles  it  possible  to establish  the  relationship  between  the  temperature  conversion  interval,  the  number  of  structural  components  and  the  type  of modifying nanoparticles. Originality. Modification of metal nanoparticles seams titanium and zirconium oxide ZrO2 TiO2 leads to the  development  of  transformation  at  high  temperatures  to  form  bainite  acicular  ferrite,  which  complex  has  a  favorable  strength, plastic  and  viscous  properties.  Carbides  TiC,  SiC  and  nitrides  of TiN,  NbN  lowering  the  bainite  start  temperature  lead  to  the formation  of  bainitic-martensitic  structures  (lower  bainite,  microphase  MAK-phase),  which  have  reduced  viscous  and  plastic properties. Compounds of VN, VC and ZrC are readily soluble in the molten metal of the weld pool and therefore, they are of little use as effective metal structure modifiers seams. Practical value. The results will be used to enhance the performance properties of HSLA steel welded joints. 

Author Biographies

V. А. Kоstin, Department of physical and chemical methods of research materials, PWI, st. Bozenko, 11, 03680, Кiev-150, Ukraine

DR. SC. (TECH.)

G. І. Grigorenko, Department of physical and chemical methods of research materials, PWI, st. Bozenko, 11, 03680, Кiev-150, Ukraine

DR. SC. (TECH.), Academician NANU

V. V. Zukov, Department of physical and chemical methods of research materials, PWI, st. Bozenko, 11, 03680, Кiev-150, Ukraine

Jr. SC. (TECH.)

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Published

2016-03-22

Issue

Section

Proceedings in memory of Starodubov