INFLUENCE OF DEFORMATION TEMPERATURE ON HOT DEFORMATION BEHAVIOR OF COLD SPRAYED 304 STAINLESS STEEL COATING MATERIAL

ZHU Chuanlin; ZHANG Junbao; CHENG Congqian; ZHAO Jie

doi:10.3724/SP.J.1037.2013.00241

Acta Metall Sin >

2013 , Vol. 49 >Issue 10: 1275 - 1280

DOI: https://doi.org/10.3724/SP.J.1037.2013.00241

INFLUENCE OF DEFORMATION TEMPERATURE ON HOT DEFORMATION BEHAVIOR OF COLD SPRAYED 304 STAINLESS STEEL COATING MATERIAL

ZHU Chuanlin ,
ZHANG Junbao ,
CHENG Congqian ,
ZHAO Jie

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1) School of Materials Science and Engineering, Dalian University of Technology, Dalian 116085
2) Baosteel Research Institute, Baoshan Iron & Steel Co., Ltd., Shanghai 201900

Received date: 2013-05-02

Revised date: 2013-07-03

Online published: 2013-10-11

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Abstract

The dense 304 stainless steel coating material was fabricated by cold spraying technology.The influence of deformation temperature on hot deformation behavior of cold sprayed 304 stainless steel coating material was investigated by thermo－mechanical simulator.The results showed that deformation resistance of cold sprayed 304 stainless steel coating material reduced with the increment of deformation temperature. The steady－state deformation resistance reduced from 315.4 MPa to 187.9 MPa when deformation temperature increased from 1000℃ to 1150℃ with deformation rate 20 s^-1 and deformation reduction 17.5%. The microsturcture of deformation sample might be divided into easy, difficult and free deformation zones. The area of easy deformation zone increased and area of difficult deformation zone decreased when deformation temperature increased from 1000℃ to 1150℃. Recrystallization occurred at free deformation zone without cracking at 1150℃. DSC curve showed that phase transition of cold sprayed 304 stainless steel coating material occurred at 1237－1265℃. The microhardness of cold sprayed 304 stainless steel coating material was 313.3 HV_0.2, which was relatively high. The microhardness of deformation samples reduced from 332.8 HV_0.2 to 244.8 HV_0.2 as the deformation temperature increased from 1000℃ to 1150℃ with deformation rate 20 s^-1 and deformation reduction 50%. The hot temperature deformation equation of cold sprayed 304 stainless steel coating material was obtained with deformation temperature 1000－1150℃ and deformation rate 5－20 s^-1. The value of hot temperature deformation activation energy was 464 kJ/mol under the deformation conditions.

Key words： cold spraying; 304 stainless steel; deformation temperature; hot deformation

Cite this article

ZHU Chuanlin , ZHANG Junbao , CHENG Congqian , ZHAO Jie . INFLUENCE OF DEFORMATION TEMPERATURE ON HOT DEFORMATION BEHAVIOR OF COLD SPRAYED 304 STAINLESS STEEL COATING MATERIAL[J]. Acta Metall Sin, 2013 , 49(10) : 1275 -1280 . DOI: 10.3724/SP.J.1037.2013.00241

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