Modeling solidification cracking: A new perspective on solid bridge fracture

Liu，Wenbin1; Li，Gan1,2,3,4; Lu，Jian1,2,3

2024-07-01

10.1016/j.jmps.2024.105651

Journal of the Mechanics and Physics of Solids   影响因子和分区

0022-5096

Solidification cracking is a longstanding and serious problem in metallurgical engineering that is encountered during casting, welding, and additive manufacturing. Extensive research has been conducted on the cracking susceptibility associated with solidification paths, microstructural effects, and thermal conditions, but it remains highly challenging to precisely predict and evaluate the solidification cracking, especially the solid bridging phenomenon and grain size dependence. In this study, a new theoretical model based on solid bridge fracture is proposed for modeling solidification cracking. The occurrence of cracking depends on competition between thermal stress accumulation and solid-bridge strength development, which is fundamentally distinct from existing models in which the cracking depends on liquid feeding. A crack-like structure is utilized to determine the thermal stress at a dendrite root, and demonstrates the absence of stress singularity in a solidifying crack. Grain features are incorporated to show that grain refinement effectively inhibits cracking by lowering the rate of accumulation of thermal stress. In this sense, the cracking susceptibility can be quantified based on grain size distributions. Numerical analyses of binary aluminum alloys validate the proposed model and provide a rational interpretation of reported experimental results in terms of cracking susceptibility, grain size effects, and cooling rate effects. This study presents and validates one of the first solid-bridge fracture-based solidification cracking models, and thus provides a new perspective to support investigation of solidification cracking.

Additive manufacturing Aluminum alloys Grain refinement Solid bridge fracture Solidification cracking

SCI ; EI

英语

其他

20241715968731

3D printing ; Additives ; Aluminum alloys ; Binary alloys ; Cracks ; Grain refinement ; Grain size and shape ; Solidification ; Thermal stress

Aluminum Alloys:541.2 ; Printing Equipment:745.1.1 ; Chemical Operations:802.3 ; Chemical Agents and Basic Industrial Chemicals:803 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Materials Science:951

ENGINEERING

2-s2.0-85190939881

Scopus

1.Laboratory of Nanomaterials & Nanomechanics,Department of Mechanical Engineering,City University of Hong Kong,Hong Kong
2.Centre for Advanced Structural Materials,City University of Hong Kong Shenzhen Research Institute,Greater Bay Joint Division,Shenyang National Laboratory for Materials Science,Shenzhen,China
3.CityU-Shenzhen Futian Research Institute,Shenzhen,518045,China
4.Shenzhen Key Laboratory for Additive Manufacturing of High-performance Materials,Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Liu，Wenbin,Li，Gan,Lu，Jian. Modeling solidification cracking: A new perspective on solid bridge fracture[J]. Journal of the Mechanics and Physics of Solids,2024,188.

Liu，Wenbin,Li，Gan,&Lu，Jian.(2024).Modeling solidification cracking: A new perspective on solid bridge fracture.Journal of the Mechanics and Physics of Solids,188.

Liu，Wenbin,et al."Modeling solidification cracking: A new perspective on solid bridge fracture".Journal of the Mechanics and Physics of Solids 188(2024).