A Study of Microstructures and Properties of High‐Carbon Si‐Cr Cast Steel Containing Rare Earth and Titanium

Abstract

The microstructure, tensile and impact behaviour of high-carbon Si-Cr cast steel containing rare earth (RE) and titanium have been determined after austempering. The additions of RE and titanium refined the primary austenite grain size resulting in improving toughness. The addition of silicon handicapped the formation of carbide and carbide-free bainitic ferrite and carbon enriched retained austenite could be obtained in the austempering structures of high-carbon Si-Cr cast steel, which had excellent mechanical properties and abrasion resistance. Moreover, the basic tendency of the mechanical properties of high-carbon Si-Cr cast steel influenced by the austempering temperature was that the hardness and tensile strength reduced and the impact toughness and fracture toughness increased with increasing temperature. The comprehensive properties were the best while austempering at 330 o C.

Impact toughness and microstructure of continuous steel wire-reinforced cast iron composite

“…El-Baradie et al [6] showed that impact toughness and elongation of spheroidal graphite cast iron increases with increasing austempering temperature. A similar result was obtained for Si-Cr cast steel by Fu et al [7]. Another way to improve the mechanical properties of a brittle material is to produce its composite material by reinforcing relatively high tough material [8][9][10][11][12].…”

Mechanical properties of a carbide-free bainitic cast steel with dispersed free ferrite

“…At present, just a limited number of studies were conducted on CFB microstructures obtained from cast steels [8-16]. As expected, mechanical properties obtained for cast CFB steels are below those reported for wrought steels, particularly regarding ductility, as a consequence of the presence of some defects in the cast parts, such as microsegregation, inclusions and micro-shrinkage cavities.…”

“…In this sense, the fully CFB cast steel covers the 1450, 1140, 1105, 1035, 930 and 895 grades, while BF cast steels cover 1140, 1035, 930, 895, 795, 725 and 620 grades. The chart also includes mechanical properties reported in [8,9,11,15,16] for CFB cast steels. Again, the mechanical performance of the steel with the microstructures developed in this work is superior to that reported for cast steels by other authors.…”

Modification of Nonmetallic Inclusions by Ti and La Complex Treatment in High‐Al Transformation‐Induced Plasticity Steel

“…Many researchers have studied the effects of Ti and RE additions on inclusion evolution and the properties of steel. [24][25][26][27][28][29][30] The complex treatment of Ti and REs could refine grains, modify inclusions, and improve the properties of steels. [31][32][33] Xie et al found that the complex treatment of Ti and La could decrease the number density (ND) of inclusions in C-Mn steel.…”