Influence of laser surface melting on the characteristics of Stellite 12 plasma transferred arc hardfacing deposit

Dilawary S. A. A., Motallebzadeh A., Paksoy A. H., Afzal M., ATAR E., Çimenoğlu H.

SURFACE & COATINGS TECHNOLOGY, cilt.317, ss.110-116, 2017 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 317
  • Basım Tarihi: 2017
  • Doi Numarası: 10.1016/j.surfcoat.2017.03.051
  • Dergi Adı: SURFACE & COATINGS TECHNOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.110-116
  • Anahtar Kelimeler: Hardfacing, Laser surface melting, Plasma transfer arc, Stellite 12, Wear, COBALT-BASED ALLOY, ABRASIVE WEAR, TOOL STEELS, COATINGS, MICROSTRUCTURE, OPTIMIZATION, TEMPERATURE, MOLYBDENUM, RESISTANCE, TOUGHNESS
  • İstanbul Teknik Üniversitesi Adresli: Evet

Özet

Stellite 12 hardfacing alloy deposited by plasma transferred arc (PTA) process on the 4140 steel substrate was subjected to laser surface melting (LSM) process. The effect of LSM on the PTA deposit was studied in terms of changes in microstructure and resultant variations in sliding wear properties. In the PTA state the microstructure, which consisted of Cr-rich (Cr7C3 and/or Cr23C6) and complex ((CoCrW)(6)C) carbides in Co matrix, was altered upon the application of LSM process. In short, LSM process led to the formation of a duplex layer, on the surface, consisting of carbide deficient and rich zones whose thickness tended to decrease with increase in the laser scan speed. As the result of formation of carbide rich zone at the outermost surface, ISM process provided an enhancement in surface hardness. On the other hand, the positive effect of LSM process on wear resistance became more apparent at high wear testing load causing carbide cracking and removal on the contact surface of Stellite 12 PTA hardfacing deposit. (C) 2017 Elsevier B.V. All rights reserved.