composition can affect hot tearing tendency . Physically, two factors contribute to hot tearing in the mushy zone. Hot tears are formed when the mushy zone is cut off from liquid feeding and is under tensile loading . Liquid feeding flows are induced by the contraction of liquid steel during cooling and shrinkage upon solidification.
Hot Tearing in Steels During Solidication:Experimental Hot tearing involves complex mechanisms during solidication. This kind of defect is associated with incomplete liquid feeding and tensile stress generated in the coherent solid 1 .
of the solidus temperature, which increases the size of the mushy zone and makes the steel more susceptible to forming hot tears. Owing to the great complexity of the phenomena that result in hot tearing, a fundamental theory to predict this defect is too
Modeling of Hot Ductility During Solidification of Steel Maria Rita Ridolfi, Hot Tearing Modeling:A Microstructural Approach Applied to Steel Solidification, Metallurgical and Materials Transactions B, 10.1007/s11663-014-0068-1, 45, 4, (1425-1438), (2014).
Modeling of hot tearing formation during solidification A new criterion for the appearance of hot tears in metallic alloys is proposed. This model introduces a critical solid fraction (f cr) to simulate feeding.A hot-cracking sensitivity (HCS) index according to the temperature and solidification time is defined and then is compared with other hot tearing criteria.
Aug 26, 2008 · A hot tear is a fracture formed during solidification. Shrinkage, hindered contraction and lake of feeding, in the mushy zone are the main phenomena leading hot tear initiation. Because of the complex mechanisms acting during the solidification of metals the prediction of a hot tearing phenomenon is not an easy task.
STEEL FOUNDERS' SOCIETY OF AMERICA TECHNICAL as it cools during and after solidification. If the mold material has suffi- cient strength or density that it cannot accommodate the thermal contraction of the steel, tensile stresses can develop sufficient to tear the steel. Hot tears usually occur in hot spots in the casting associated with
Solidification Macroprocesses (Modeling of stress analyses of mechanical behavior, distortion and hot-tearing during solidification. The governing equations are presented first, followed by a brief description of the methods used to solve them. Finally, a few examples of recent applications in shape castings and continuous casting are introduced.
Hot-Tear Causes 1. Hindered contraction during the latter stages of solidification Casting/rigging design features:opposing flanges or appendages, gating system runners 2. Hot spot or large thermal gradient isolated heavy section, or heat concentration at an ingate or riser contact 3.
What is hot cracking (solidification cracking)? - TWIInformation on certain aspects of avoiding solidification cracking in a variety of weldable materials is given in the job knowledge series:Defects - solidification cracking; Weldability of materials - stainless steel. Also see here for information on the susceptibility of ferritic stainless steels to hot Simulation of Hot Tearing and Distortion during Casting Hot tears are defects that occur during solidification of a casting that is subjected to mechanical restraints. Several key factors are known to aggravate the hot tearing of cast steel. These factors include:increasing the duration of a hot spot without increasing