A review on the causes and suppression mechanisms of cracks in laser-clad coatings
XIE Xiaoming
ZENG Ningfu
LIU Guan
ZHAO Kai
PENG Lei
AO Dengkui
Abstract：Laser cladding has established itself as a key technology in surface strengthening and remanufacturing,owing to its broad material selectivity,high bonding strength,and minimal heat-affected zone.However,the intrinsic rapid melting and solidification process often induces significant residual stress,leading to crack initiation and propagation within the coating,which severely limits its broader application.This paper provides a systematic review of the causes,suppression methods,and underlying mechanisms of cracks in laser-clad coatings.It begins with an in-depth analysis of crack origins from the perspectives of residual stress(comprising thermal stress,phase transformation stress,and constraint stress)and the matching of material physical properties.Subsequently,it elaborates on the operating mechanisms and research progress of various crack suppression strategies,including optimization of process parameters,addition of transition layers or rare earth elements,implementation of pre-heating and post-heat treatments,application of external auxiliary fields(e.g.,induction,electromagnetic,ultrasonic),and integration of in-situ process monitoring with numerical simulation.Finally,future development trends toward intelligentization and multi-field coupling are outlined.This review aims to furnish a theoretical basis and technical support for understanding the formation mechanisms,effective control,and suppression of cracks in laser-clad coatings.
Keywords：laser claddingcoatingcrackresidual stresssuppression mechanism
Publication Date：2025-11-20
Online Publishing Date：2026-01-06(First online date of this platform, not the publication date of the document)
Pages：10( 1-10 )