Abstract
1. After thermal cycling to simulate multilayer welding, the structure of medium-alloy bainitic steels (14Kh2N3MA) does not differ from that of samples subjected to a single-layer welding cycle. After the thermal cycle simulating multilayer welding one observes only an increase in the etchability of austenite grain boundaries in reagents containing picric acid. A high concentration of phosphorus is observed in austenite grain boundaries. 2. The lower resistance of the samples to cold cracking in the heat-affected zone of multilayer weld seams can be explained by the lower cohesive strength of existing austenite grain boundaries due to segregation of phosphorus in the boundaries. 3. To reduce the susceptibility of medium-alloy steels to cold cracking we recommend the optimal procedure for multilayer welding.
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