Microstructure evolution of low alloy wear resistant steels during heat treatment procedure

Microstructure evolution of low alloy wear resistant steels during heat treatment procedure was studied in this paper. The results showed that During furnace cooling in homogenizing, Chromium/iron, Niobium, Vanadium and other hardly soluble carbides formed. But Chromium/iron carbides could resolve into austenite during quenching procedure, while the other carbides barely changed. Carbon addition grew the carbides into shuttle shapes and inflated the austenite grains. But Ni addition broadened the martensite lath width without dilating the austenite grains. And it hardly influenced the carbides formation. Vanadium addition seemed that the martensite lathes were cut into several discontinues sections. With the temperature rising, the boundaries got blurred, which might correlated with the decomposing of retained austenite.

Improvement for Microstructure of Severely Deformed JIS S45C Steel after Rolling Process

A new heat treatment procedure is proposed to remove the strong texture microstructure of JIS type G4051 S45C rolled steel, thus making ease for further machining process and hardening to obtain higher hardness and grain homogeneousness over the common heat treatment procedure. This procedure includes annealing and normalising process and is applied for f14x20 mm samples. By annealing process at approximate 840 to 880°C for 2 to 6 hours, the strong texture has been improved by about 30-40% in comparison to the conventional crystallization process. By normalising process at 880°C and 920°C for 15 minutes, the strong texture has almost treated. The grain size along the rolling direction (RD) and traverse direction (TD) are in the range of 15 to 50 μm.

Effects of sol–gel process parameters on the anticorrosive performance of phosphosilicate hybrid coatings for carbon steel: structural and electrochemical studies

The effects of several sol–gel process parameters such as acid catalyst addition and the heat treatment procedure on porosity and anticorrosive properties were investigated for phosphosilicate sol–gel hybrid coatings prepared from 3-[(methacryloyloxy)propyl] trimethoxysilane (MEMO) and bis-[2-(methacryloyloxy)ethyl] phosphate (BMEP).

Microstructure Changes of Steel Materials under Isothermal Heat Treatment in Salt Bath

To improve the mechanical properties of steel materials such as Vanadis 4extra, Vanadis 10, Vancron 40, and Böhler S600, the isothermal heat treatment procedure using salt bath was used. Samples of the steels were processed at different time of austempering at various temperatures and compared to the samples processed by heat treatment (i.e. quenching in air or quenching in oil and tempering in air) which is most widely used in practice. Hardness properties are determined by the steel microstructure, the size and number of carbide particles in this microstructure. The suitability of heat treatment for improving mechanical properties of different steel materials is assessed.

Effect of Different Inoculants on Impact Toughness in High Chromium Cast Iron

The present work, presented the study of effect of different inoculants on impact toughness in High Chromium Cast Iron. The molds were pouring in industrial conditions and samples were tested in laboratory in Faculty of Foundry Engineering at AGH. Seven samples were tested - one reference sample, three with different addition of Fe-Ti, and three with different addition of Al. The samples were subjected to impact toughness on Charpy hammer and the hardness test. The presented investigations indicate that for the each inoculant there is an optimal addition at which the sample obtained the highest value of impact toughness. For the Fe-Ti it is 0.66% and for Al is 0.17%. Of all the examined inoculants best results were obtained at a dose of 0.66% Fe-Ti. Titanium is a well-known as a good modifier but very interesting results gives the aluminum. Comparing the results obtained for the Fe-Ti and Al can be seen that in the case of aluminum hardness is more stable. The hardness of all samples is around 40-45 HRC, which is not high for this type of cast iron. Therefore, in future studies it is planned to carry out the heat treatment procedure that may improves hardness.