Effect of the initial structure of 10Kh2GNM steel and the thermal welding cycle on the variation of the fatigue limit and crack resistance characteristics

Abstract

The weldability of HSLA steels is reviewed in relation to their microstructure in the heat‐affected zone (HAZ) when they are subjected to welding heat cycles using a simulation technique. The presence of precipitates of alloying elements is of the utmost importance for controlling grain size, on which the good mechanical properties of these steels depend.     

Estimating microdamage tendencies from standard uniaxial stretching tests

Test results for several steels are presented on the tendency to microdamage in relation to the composition and structural state. A method is proposed that incorporates the tendency to microdamage in relation to the structural state of the main metal and of welded joints.     

Effects of weld shape and defect size on the stress and strain in a welded joint to a vertical steel vessel

Finite-element simulation is applied to a shoulder unit in a tank on the basis of the ANSYS computing suite. The best shape for an internal shoulder weld is one with a concavity of 2–4 mm; when one calculates the working life of such a joint on cyclic loading, one should use the SHELL elements.     

Use of mottled clay in the manufacture of grog refractories based on Vladimirovka kaolin

This paper sums up a study into the effect of mottled clay on the density of a grog—kaolin mix in pressing and firing. It is shown inadvisable to use coarse-ground mottled clay in the sintering of specimens. The clay was found to produce the best effect when added to the product batch as a fine co-ground mixture with grog or as a slip. The main process variables are given for the manufacture of critical grog refractories with mottled clay as the sintering agent.