Anishchenko О.S., Kukhar V.V., Pryisyazhnyi A.G. Influence of thermomechanical processing to invar wire properties.

  • О.С. Аніщенко
  • В.В. Кухар
  • А.Г. Присяжний

Abstract

The article contains information on thermomechanical processing of rolled metal and wire from invar. Thermome-chanical treatment of Invar contained operations of pressure treatment in the form of rolling and drawing, as well as heat treatment in the form of quenching, tempering and aging. The authors investigated 8 treatment regimes: «1» – hot rolling + quenching from 840 ºC in water + tempering at 315 ºC during 1 h + cooling with the furnace (standard mode according to GOST 14082); «2» – hot rolling; «3» – hot rolling + annealing at 850 ºC during 30 min with cooling in air; «4» – hot rolling + tempering at 315 ºC during 1 h; «5» – hot rolling + cold drawing; «6» – hot rolling + annealing at 850 ºC during 30 min with air cooling + cold drawing; «7» – hot rolling + tempering at 315 ºC during 1 h + cold drawing; «8» – hot rolling + cold drawing + hardening from 830 ºC in water + tempering at 315 ºC during 1 h + aging at 95 ºC during 48 h. Authors have es-tablished that the cold drawing of a wire from invar with a draw ratio of 12.5 provides: at temperatures of 20…50 ºC, the thermal expansion coefficient (TEC) < 0, and in the temperature range of 20…100 ºC – a stable value of TEC ≤ 1.0•10-6 deg -1 after 1000 and 2000 h of aging. Cold wire drawing with an hood wire stretching of 3.58 provides a standard value of TEC ≤ 1.0•10-6 deg.-1 if the drawing is the last operation of thermomechanical invar treatment. Key words: invar, wire, drawing, thermal expansion coefficient, hardening, tempering, aging

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Published
2017-10-14
Section
Articles