Abstract
The effect of parameters on internal crack healing in 30Cr2Ni4MoV steel for 600-ton ultra-super ingots was systematically investigated. The results show that the degree of crack healing increases with increasing healing temperature, holding time, reduction ratio, and hot pressure, and with decreasing strain rate. Internal crack healing in 30Cr2Ni4MoV steel should be conducted at less than 1200 °C to avoid grain coarsening. Hot pressure, in the high-temperature elastic zone and perpendicular to the crack faces, not only promotes the rapid crack healing, but also prevents grain coarsening of the matrix.
Highlights
Heavy forgings are key parts of electric power, metallurgy, petrochemical, shipbuilding, nuclear energy, and other industries
Dong et al [12] studied hydrogen-induced crack healing in a carbon steel by heat treatment, and the results indicated that a hydrogen-induced crack can be completely healed by cyclic heat treatment between room temperature and 1000 ◦ C
The crack healing degree increased with increasing healing temperature, holding time, reduction ratio, and hot pressure, and with decreasing strain rate
Summary
Heavy forgings are key parts of electric power, metallurgy, petrochemical, shipbuilding, nuclear energy, and other industries. Cracks and other cavity-type defects may be induced by inhomogeneous deformation during the forging and subsequent processes. These cavity-type defects will severely deteriorate the mechanical properties of the heavy forgings and be the primary cause of rejects [3,4]. Healing cracks and eliminating cavity-type defects in the heavy forgings will reduce rejection rates, and improve their mechanical properties and service life. This will save large amounts of energy and greatly benefit economy and ecology
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