Fracture Behavior of Cold Sprayed 304 Stainless Steel Coating During Cold Rolling  

作　　者：MENG Xian-ming ZHANG Jun-bao HAN Wei ZHAO Jie 

机构地区：[1]School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning,China [2]Baosteel Research Institute, Baoshan Iron and Steel Co Ltd, Shanghai 201900, China

出　　处：《Journal of Iron and Steel Research International》2012年第11期57-63,共7页

基　　金：Item Sponsored by National Basic Research Program of China(2009CB724305)

摘　　要：The fracture behavior of cold sprayed 304 stainless steel coating in cold rolling process was studied. The 304 stainless steel coatings were deposited on low carbon steel substrate by cold gas dynamic spray （CGDS） and then cold rolled, respectively. The fracture morphology of the coatings was observed and analyzed, and the crack distri- butions along the longitudinal rolling direction of the coatings were also investigated and discussed. The results showed that the cohesive strength of the cold sprayed 304 stainless steel coating was too low to be cold rolled. Mi crocracks were formed in the as-sprayed coatings and ran perpendicularly to the rolling direction. The spacing dis- tance between these cracks decreased with the increase of the cold rolling reduction. In addition, it was also found that the initial crack generated at the surface of the coating and propagated from the surface to the interface along the weakly bonded particles. A theoretical analysis was developed for the coating fracture. It gave a critical minimum cohesive bonding strength of the coating for non-breaking in cold rolling process. The crack propagation manner of the cold rolled coatings was also discussed.The fracture behavior of cold sprayed 304 stainless steel coating in cold rolling process was studied. The 304 stainless steel coatings were deposited on low carbon steel substrate by cold gas dynamic spray （CGDS） and then cold rolled, respectively. The fracture morphology of the coatings was observed and analyzed, and the crack distri- butions along the longitudinal rolling direction of the coatings were also investigated and discussed. The results showed that the cohesive strength of the cold sprayed 304 stainless steel coating was too low to be cold rolled. Mi crocracks were formed in the as-sprayed coatings and ran perpendicularly to the rolling direction. The spacing dis- tance between these cracks decreased with the increase of the cold rolling reduction. In addition, it was also found that the initial crack generated at the surface of the coating and propagated from the surface to the interface along the weakly bonded particles. A theoretical analysis was developed for the coating fracture. It gave a critical minimum cohesive bonding strength of the coating for non-breaking in cold rolling process. The crack propagation manner of the cold rolled coatings was also discussed.

关 键 词：FRACTURE cold spraying cold rolling 304 stainless steel coating microstructure 

分 类 号：TG174.442[金属学及工艺—金属表面处理] TG335.12[金属学及工艺—金属学]