Effect of laser-quenching substrate on interfacial shear strength of chromium plated coatings
-
1.
Department of Mechanical & Electrical Engineering, Jianghai Polytechanic College, Yangzhou 225101, China
-
Received Date:
2011-11-04
Accepted Date:
2011-12-15
-
Abstract
Based on the real condition that laser quenching steel substrate could improve the service life of chromium-plated gun bore,the interfacial shear strengths of Cr-plating coating on laser re-quenching substrate and laser non-treating one were measured by multi-cracks tensile method respectively.The experimental results show that the interfacial shear strength is increased by 77.7% through laser re-quenching steel substrate.The analysis of interface structure between substrate and Cr-coating shows that the interface of laser pretreatment is a continuous transition,while there is an over-layer on the original interface.The mechanical model analysis shows that the compressive residual stress in the laser processing zone could increases fracture stress of chromium coating and the improvement of substrate surface hardness decreases maximum crack spacing.The synthetic result of above two effecting factors is that the interfacial shear strength is increased by laser re-quenching substrate.
-
-
References
|
[1]
|
UNDERWOOD J H,PARKER A P,VIGILANTE G N,et al.Thermal damage,cracking and rapid erosion of cannon bore coatings[J].Journal of Pressure Vessel Technology,2003,125 (3):299-304. |
|
[2]
|
UNDERWOOD J H,TROIANO E.Critical fracture processes in army cannons:a review[J].Journal ofPressure Vessel Technology,2003,125(3):287-292. |
|
[3]
|
CHEN G N,LUO G X.ZHANG K.et al.A new method for improving service life of chrome-plated gun barrels by laser strengthening[J].Acta Arnamentaria,2003,24(s1):6-10(in Chinese). |
|
[4]
|
XU X Y,ZHANG K,CHEN G N,et al.Influence of laser hardening substrate on microstructure and bonding of electroplating chromium coating[J].Chinese Journal of Lasers,2006,33 (3):413-416 (in Chinese). |
|
[5]
|
ZHANG G X.Effect of laser quenched substrate on the surface morphology of Cr-plating coatings[J].Laser Technology,2011,35 (6):752-755 (in Chinese). |
|
[6]
|
VINCI R P,VLASSAK J J.Mechanical behavior of thin films[J].Annual Review of Materials Science.1996.26:431-462. |
|
[7]
|
YANAKA M,TSUKAHARA Y,NAKASO N,et al.Cracking phenomena of brittle films in nanostructure composites analysed by a modified shear lag model with residual strain[J].Journal of Materials Science,1998,33(8):2111-2119. |
|
[8]
|
HOLZARTH U.STAMM H.Mechanical and thermomechanical properties of commercially pure chromium and chromium alloys[J].Journal of Nuclear Materials,2002,300 (2/3):161-177. |
|
[9]
|
OBERGFELL K,SCHULZE V,VOHRINGER O.Classification of microstmctural changes in laser hardened steel surfaces[J].Materials Science and Engineering,2003,A355 (1/2):348-356. |
|
[10]
|
HUM S,EVANS G A.The cracking and decohesion of thin films on ductile substrates[J].Acta Metallurgica,1989,37(3):917-925. |
|
[11]
|
TABOR D.Hardness of metals[M].London,UK:Oxford at the Clarendon Press,1951:166. |
-
-
Proportional views
-
Map
DownLoad: