Effect of heat treatment on mechanical performance of hydraulic breaker alloys

Yilmaz S. O., TEKER T., Erisen A.

Materialpruefung/Materials Testing, cilt.67, sa.9, ss.1431-1443, 2025 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 67 Sayı: 9
  • Basım Tarihi: 2025
  • Doi Numarası: 10.1515/mt-2025-0163
  • Dergi Adı: Materialpruefung/Materials Testing
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex
  • Sayfa Sayıları: ss.1431-1443
  • Anahtar Kelimeler: AISI 4140, AISI 4340, hyraulic breaker, mechanical properties, microstructure, tempering
  • Sivas Cumhuriyet Üniversitesi Adresli: Evet

Özet

Hydraulic breaker is a frequently used piece of equipment in construction and industrial fields. With the advancement of modern industrial technology, users have come to demand higher standards. Therefore, construction equipment has to offer high structural stability, performance, and efficiency. In this study, the effects of austenitizing and tempering processes on the mechanical strength of AISI 4140-4340 steels for rock breaking applications were investigated. Microstructural alterations were examined using optical microscope (OM) and a scanning electron microscope (SEM). The mechanical characteristics of the steels were assessed through tensile, hardness, and impact tests. At 250 C, isothermal retention formed bainite and tempered martensite. At 300 and 350 C, isothermal retention produced bainite and untempered martensite. Austempering produced lower hardness but higher impact toughness than quenching and tempering.