The influence of various heat treatment modes of high nitrogen martensitic corrosion-resistant steel of grade 30H15AMF-ShPD (VNS78-ShPD) on the corrosion resistance of the steel in tough test conditions is considered. The effect of different quenching and tempering temperatures on the microstructure, hardness and corrosion properties of the steel is studied.

The change in electrical resistivity of austenitic nitrogen-containing steel VNS53-Sh has been studied depending on heat treatment in the temperature range of 200–1000 °C. Using the IACS standard resistivity measurement method, the relationship between electrical resistivity and structural-phase transformations has been established, including chromium nitride precipitation, formation of discontinuous decomposition zones, and recrystallization. Threshold values of electrical resistivity for non-destructive testing of the phase composition of the steel under production conditions have been determined.
 

A generalized dimensionless crack-resistance criterion $\Xi$ for nickel-based superalloys processed by selective laser melting is proposed – the ratio of the plastic relaxation functional to the damage accumulation functional, combining solidification cracking, strain-age cracking and grain-boundary embrittlement with the $\gamma'$ precipitation kinetics. Defect-free synthesis corresponds to $\Xi > \Xi_{\text{cr}}$ with $\Xi_{\text{cr}} = 1$. The criterion accounts for 94 % of the experimental crack density variance against 41–74 % for known criteria. The VZhS1 (adjusted $R^2 = 0{,}88$ for six fitted parameters) and VZhS3 alloys designed with it were synthesized crack-free.