The effect of different austenite grain size and different cooling rates on the austenite to ferrite transformation temperature and different ferrite morphologies in one Nb-microalloyed (HSLA) steel has been investigated. Three different austenite grain sizes were selected and cooled at two different cooling rates for obtaining austenite to ferrite transformation temperature. Moreover, samples ...

Shielded metal arc welding and thermal simulation experiment were carried out for constructional steel containing 0% V 0.10% V, the microstructure, precipitation feature, microhardness HV0.2, −20 °C impact value in heat affected zone (HAZ) investigated. The results showed that coarse-grained (CGHAZ), N completely dissolved matrix of to promote growth prior austenite grains, meanwhile fraction h...

The wear and rolling contact fatigue (RCF) performance of eutectoid hypereutectoid rail steels were studied. Subsequently, the microstructure evolutions subsurface materials these two after testing comparatively investigated. results indicated that, compared with rail, had lower loss, but longer RCF crack lengths. After rolling-sliding testing, original equiaxed undeformed coarse grains rails i...