Metallurgical and Crystallographic Analysis of Different Amounts of Deformation Applied to Hadfield Steel


Altuntaş G., Bostan B., Altuntas O., Öztürk M. K.

INTERNATIONAL JOURNAL OF METALCASTING, 2022 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Publication Date: 2022
  • Doi Number: 10.1007/s40962-022-00860-3
  • Journal Name: INTERNATIONAL JOURNAL OF METALCASTING
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Communication Abstracts, Compendex, Metadex, Civil Engineering Abstracts
  • Keywords: hadfield steel, crystallographic analysis, casting, dislocation density, deformation, STACKING-FAULT ENERGY, BEHAVIOR, TRANSFORMATION, MARTENSITE, WEAR, STRENGTH, SINGLE
  • Gazi University Affiliated: Yes

Abstract

It is known that the strength and hardness of Hadfield steel increases by strain hardening when subjected to some deformation. In this study, the specimens of conventional Hadfield steel were heat treated by solid solution treatment followed by quenching. The specimens were then subjected to various deformations of 1, 2, and 5% under different compressive loads. The crystallography of specimens and the occurred metallurgical phase transformations were evaluated. Microstructural characterizations of the specimens were investigated using optical microscope and scanning electron microscope. Dislocation density, lattice strain and crystallite size values were calculated with two different formulas using Cu and Co X-ray radiation. The effect of the transformations on the mechanical properties was determined by using the microhardness measurement method (HV0.1). It was observed that twinning in the microstructure increased with increasing deformation rate, and accordingly, the hardness and dislocation densities changed significantly. It was calculated that the dislocation density of the specimen with 5% deformation increased by approximately fifteen times compared to the specimen with 1% deformation. In addition, it was determined that epsilon martensite turned into alpha' martensite with the increase in deformation rate. The results show that Hadfield steel can continue to work by improving its properties under 5% compression load.