Mechanical Behavior of 3-ply Cu-Ni-Zn/Cu-Cr/Cu-Ni-Zn Composite Plate Processed by Roll Bonding

2013 ◽  
Vol 813 ◽  
pp. 43-46
Author(s):  
Hob Yung Kim ◽  
Jae Sook Song ◽  
Sun Ig Hong
Keyword(s):  
Heat Treatment ◽  
Composite Plate ◽  
Strain Curve ◽  
Composite Plates ◽  
Aging Condition ◽  
Stress Strain Curve ◽  
Roll Bonding ◽  
Final Fracture ◽  
Heat Treated ◽  
Peak Aging

3-ply Cu-Ni-Zn/Cu-Cr/Cu-Ni-Zn clad composite plates were prepared by roll bonding at 823K and their properties were characterized. No intermetallic compounds were observed at Cu-Ni-Zn/Cu-Cr interfaces in the as-rolled and heat-treated Cu/Ni-Zn/Cu-Cr/Cu-Ni-Zn clad plates. The strength of as-rolled clad plate reached up to 420MPa with the ductility of 13%. After heat treatment at 723K for 1.5 hours, the strength of Cu-Ni-Zn/Cu-Cr/Cu-Ni-Zn clad composite plate dropped to 340 MPa and the ductility increased to 20%. With annealing at 723K, there is no drastic drop of the stress before final fracture, meaning three plates were bonded together until the last part of the stress-strain curve. The peak of the conductivity (>70% of IACS) was attained after aging for 1.5 hrs, compatible with the typical peak aging condition of Cu-Cr alloy.

Mechanical Properties of Cu-Ni-Zn/Cu-Cr/Cu-Ni-Zn Composite Plate Processed by Explosive Bonding and Cold Rolling

2014 ◽  
Vol 951 ◽  
pp. 83-86 ◽  
Author(s):  
Gyeong Tae Kang ◽  
Jae Sook Song ◽  
Sun Ig Hong
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Cold Rolling ◽  
Composite Plate ◽  
Strain Curve ◽  
Composite Plates ◽  
Mechanical Reliability ◽  
Stress Strain Curve ◽  
Final Fracture ◽  
Interfacial Bonding Strength

Mechanical properties of 3-ply Cu-Ni-Zn/Cu-Cr/Cu-Ni-Zn clad composite plates prepared by explosive bonding and cold-rolling. No intermetallic compounds were observed at the Cu-Ni-Zn/Cu-Cr interface after explosive bonding and cold-rolling and heat-treatment at 723K. The strength of as-rolled clad plate reached up to 575MPa with the ductility of 30% after heat treatment at 723K for 1 hour. The strength dropped to 510MPa and the ductility increased to 48% after heat treatment at 723K for 1.5 hour. There are no stepwise drops of the flow stress before final fracture, meaning three plates were bonded together until the last moment of the stress-strain curve. The observation of the fractured specimens revealed no interface separation even after fracture. The excellent mechanical reliability and the good interfacial bonding strength can be attributed to the absence of detrimental interfacial reaction compounds between Cu-Ni-Zn and Cu-Cr after annealing.

Mechanical Properties and Microstructure of Cu-Ni-Zn/Cu-Cr/Cu-Ni-Zn Clad Plate Processed by High Pressure Torsioning (HPT)

2013 ◽  
Vol 683 ◽  
pp. 318-321
Author(s):  
Hob Yung Kim ◽  
Jong Su Ha ◽  
Ki Hwan Oh ◽  
Sun Ig Hong
Keyword(s):  
Mechanical Properties ◽  
High Pressure ◽  
Composite Plate ◽  
Room Temperature ◽  
Composite Plates ◽  
Layered Composite ◽  
Mechanical Reliability ◽  
Final Fracture ◽  
Heat Treated ◽  
Interfacial Bonding Strength

Cu-1 wt. % Cr was clad between Cu-Ni-Zn plates to form 3-layered composite by high pressure torsioning (HPT) at room temperature and theirmicrostructure and mechanical propertieswereexamined. No intermetallic compounds were observed at the interfaces in the as-HPTed and heat-treated 3-layered composite plates. The strength of as-HPTed composite plate reached up to 650 MPa with the ductility of 7 %. After heat treatment at 500oC, Cu-Ni-Zn/Cu-Cr/Cu-Ni-Zn clad plate exhibited the strength up to 420 MPa and the ductility of 32 %. The clad plate fractured all together at the same time without discontinuous drop of the stress until final fracture. The excellent mechanical reliability and the good interfacial bonding strength can be attributed to the absence of detrimental interfacial reaction compounds between Cu-Ni-Zn and Cu-Cr.

Formability of Ultrafine-Grained AA6016 Sheets Processed by Accumulative Roll Bonding

2012 ◽  
Vol 504-506 ◽  
pp. 575-580 ◽  
Author(s):  
Tina Hausöl ◽  
Christian W. Schmidt ◽  
Verena Maier ◽  
Wolfgang Böhm ◽  
Hung Nguyen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Laser Heat Treatment ◽  
Bending Tests ◽  
Roll Bonding ◽  
Laser Heat ◽  
Heat Treated ◽  
Ultrafine Grained ◽  
Ultrafine Grained Microstructure ◽  
Bending Behaviour

Aluminium alloy AA6016 was accumulative roll bonded up to eight cycles in order to produce an ultrafine-grained microstructure. The formability of these sheets was investigated by means of bending tests. Furthermore the influence of a local laser heat treatment at the bending edge is observed. The strength of the UFG samples is increased by a factor of around two compared to the conventionally grained T4 condition which also results in up to 50 % higher punch forces needed for bending of ARB processed samples. An anisotropic bending behaviour is observed. By applying a tailored laser heat treatment along the bending edge prior to the bending tests a local recrystallization and recovery at the deformation zone of the samples is achieved. Thus, ductility is increased locally whereby bending to an angle of 80° is possible with lower forming forces compared to the non-heat treated specimens. The results are compared to previous studies on mechanical properties and formability investigations of ARB processed AA6016.

Anisotropy of the Stress-Strain Curves for Line Pipe Steels

2010 ◽  
Author(s):  
Kensuke Nagai ◽  
Yasuhiro Shinohara ◽  
Shinya Sakamoto ◽  
Eiji Tsuru ◽  
Hitoshi Asahi ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Strain Curve ◽  
Longitudinal Direction ◽  
Stress Strain Curve ◽  
Forming Process ◽  
Stress Strain ◽  
Line Pipe ◽  
Lower Aging Temperature ◽  
House Type ◽  
The Difference

To suppress the appearance of Lu¨ders strain and to decrease yield to tensile strength ratio in the L-direction (longitudinal direction), as well as the C-direction (circumferential direction), have been more important for strain-based design. In this study, conventional UOE and ERW pipes were examined in terms of tensile properties in both directions. In the case of UOE pipes, yield point was clearly observed on the stress-strain curve in the C-direction. However, stress-strain curves in the L-direction showed the round-house type. This difference became prominent after heat treatment for the anti-corrosion. Namely, clear Lu¨ders strain appeared in the C-direction at a lower aging temperature compared with that in the L-direction. On the other hand, contrasting results were obtained in the case for ERW pipes. Thus far, it’s been thought that the difference between UOE and ERW pipe was caused by the direction of final strain during the pipe forming process. There are also differences in the occurrence of Lu¨ders strain between each grade. A stress-strain curve maintained the round-house type in X100 grade pipe after the heat treatment at 240°C for five minutes; however, X70 grade pipe showed the stress-strain curve in the L-direction with Lu¨ders strain after the heat treatment at the same temperature.

Experimental Research on Mechanical Properties of SPS Composite Plate

2014 ◽  
Vol 1014 ◽  
pp. 37-40
Author(s):  
Guang Ping Zou ◽  
Ye Wu
Keyword(s):  
Mechanical Properties ◽  
Experimental Research ◽  
Composite Plate ◽  
Strain Curve ◽  
Steel Plates ◽  
Preparation Process ◽  
Paper Briefly ◽  
Stress Strain Curve ◽  
Bending Tests ◽  
Three Point Bending

This paper briefly describes the preparation process of SPS composite plate. The compress, buckling and three-point bending tests of SPS composite steel plates are studied. Each test gives the failure mode and stress-strain curve. The results may provide a reference for further research and engineering applications of SPS composite plate.

Mechanical and Microstructural Analyses of Three Layered Cu-Ni-Zn/Cu-Zr/Cu-Ni-Zn Clad Material Processed by High Pressure Torsioning (HPT)

2012 ◽  
Vol 557-559 ◽  
pp. 1161-1165
Author(s):  
Ki Hwan Oh ◽  
Hob Yung Kim ◽  
Sun Ig Hong
Keyword(s):  
Heat Treatment ◽  
High Pressure ◽  
Intermetallic Compounds ◽  
Interfacial Reaction ◽  
Room Temperature ◽  
Mechanical Reliability ◽  
Final Fracture ◽  
Heat Treated

Cu-Ni-Zn/Cu-Zr/Cu-Ni-Zn three layered clad plates were prepared by high pressure torsioning (HPT) at room temperature and theirmicrostructural and mechanical analyses wereperformed. No intermetallic compounds were observed at Cu-Zr/Cu-Ni-Zn interfaces in the as-HPTed and heat-treated Cu/Ni-Zn/Cu-Zr/Cu-Ni-Zn clad plates. The strength of as-HPTed clad plate reached up to 610 MPa with the ductility of 14%. After heat treatment at 500oC, Cu-Ni-Zn/Cu-Zr/Cu-Ni-Zn clad plate exhibited the strength up to 490 MPa and the ductility of 28 %. The clad plate fractured all together at the same time without discontinuous drop of the stress until final fracture. The excellent mechanical reliability and the good interfacialbonding strength can be attributed to the absence of detrimental interfacial reaction compounds between Cu-Ni-Zn and Cu-Zr.

Effect of Post-HPT Heat Treatment on the Mechanical Performance in Ti/Cu-Cr/S20C Clad Materials

2012 ◽  
Vol 557-559 ◽  
pp. 385-389 ◽  
Author(s):  
Jong Su Ha ◽  
In Kyu Kim ◽  
Sun Ig Hong
Keyword(s):  
Heat Treatment ◽  
Mechanical Performance ◽  
Compound Layer ◽  
Reaction Products ◽  
Stress Strain ◽  
Final Fracture ◽  
Indentation Mark ◽  
Heat Treated ◽  
Clad Metals ◽  
One Step

In this study Ti/Cu-Cr/S20C were clad by High Press Torsioning(HPT) and the effect of post-HPT heat treatment on the interfacial reaction products and the mechanical performance in Ti/CuCr/S20C clad material were studied. No cracks were observed to be emanated from the corner of the indentation mark on the intremetallic compound layer at the Ti/Cu-Cr interface, suggesting those intermetallic compounds is not so brittle. The stress-strain curves exhibited three steps in as-HPTed clad samples and those heat-treated at 500°C for 1hr. Step-wise fracture occurred in the sequence of S20C, Cu-Cr and Ti with each fracture resulting in the sudden drop of the stress. The stress-strain curves exhibited two steps in clad metals annealed at 600°C for 1hr, with first step corresponding to the fracture of S20C plate and the second one corresponding to the concurrent fracture of Ti and Cu-Cr plates. Ti/Cu-Cr/S20C heat-treated at 600°C for 24hrs exhibited just one step final fracture, suggesting that the bonding strengths are high enough to resist the localized strain concentration at the interfaces.

Effect of Heat Treatment on Galvanic Corrosion of Cu/Al/Cu Clad Soaked in 3.5% NaCl Brine Solution

2015 ◽  
Vol 1102 ◽  
pp. 55-58
Author(s):  
Gyeong Tae Kang ◽  
Sun Ig Hong
Keyword(s):  
Heat Treatment ◽  
Intermetallic Compounds ◽  
Corrosion Behavior ◽  
Galvanic Corrosion ◽  
Intermetallic Layer ◽  
Soaking Time ◽  
Brine Solution ◽  
Roll Bonding ◽  
Heat Treated

The galvanic corrosion of Cu/Al/Cu clad in 3.5% NaCl brine solution has been studied. No visible intermetallic compounds were found at the Cu/Al interface after roll-bonding, But Intermetallic layer grew up to 40μm after heat treatment 500°C for 10hours. The galvanic corrosion occurred significantly in the Al region in contact with Cu. The depth of the dissolved Al gradually decreased with distance away from the Cu/Al interface. Both IDR width and IDR depth increased steadily with increase of soaking time. The IDR width and depth of as-roll-bonded Cu/Al/Cu is far greater than those of heat-treated Cu/Al/Cu at 500°C for 10hours, suggesting the presence of intermetallic compounds influences the galvanic corrosion behavior.

Effect of a Complex Heat Treatment on the Structure of 300M Steel

1981 ◽  
Vol 39 ◽  
pp. 312-313
Author(s):  
R. Padmanabhan ◽  
W. E. Wood
Keyword(s):  
Heat Treatment ◽  
Metal Carbides ◽  
Austenite Grain Size ◽  
300M Steel ◽  
Heat Treated ◽  
Strain Fracture ◽  
Prior Austenite Grain Size ◽  
Short Time ◽  
Final Tempering ◽  
Similar Yield

Intermediate high temperature tempering prior to subsequent reaustenitization has been shown to double the plane strain fracture toughness as compared to conventionally heat treated UHSLA steels, at similar yield strength levels. The precipitation (during tempering) of metal carbides and their subsequent partial redissolution and refinement (during reaustenitization), in addition to the reduction in the prior austenite grain size during the cycling operation have all been suggested to contribute to the observed improvement in the mechanical properties. In this investigation, 300M steel was initially austenitized at 1143°K and then subjected to intermediate tempering at 923°K for 1 hr. before reaustenitizing at 1123°K for a short time and final tempering at 583°K. The changes in the microstructure responsible for the improvement in the properties have been studied and compared with conventionally heat treated steel. Fig. 1 shows interlath films of retained austenite produced during conventionally heat treatment.

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