Effects of laser heat treatment on mechanical properties of ceramic coated steelsPart 2 – Fracture strength of laser heat treated ceramic thin film

2014 ◽  
Vol 18 (sup1) ◽  
pp. S1-17-S1-21
Author(s):  
H. Tanabe ◽  
K. Ogawa ◽  
Y. Izumi ◽  
T. Takamatsu ◽  
H. Nakagawa ◽  
...  
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Heat Treatment ◽  
Fracture Strength ◽  
Laser Heat Treatment ◽  
Laser Heat ◽  
Heat Treated ◽  
Ceramic Thin Film

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.

scholarly journals Nanostructuring Behavior of NiCrBSi and CoCrWC Thermal Spray Coatings Formed by Temperature-Controlled Laser Heat Treatment

2020 ◽  
Vol 58 (4) ◽  
pp. 247-256 ◽  
Author(s):  
Eun-Joon Chun
Keyword(s):  
Heat Treatment ◽  
Thermal Spray ◽  
Spray Coating ◽  
Thermal Spray Coating ◽  
Laser Heat Treatment ◽  
Real Time Control ◽  
Continuous Casting Mold ◽  
Time Control ◽  
Laser Heat ◽  
Heat Treated

.For surface hardening of a continuous casting mold component, a thermal spray coating of NiCrBSi (Metco-16C) and CoCrWC (Stellite-1) was performed followed by laser heat treatment of the coatings. To support selective modification of the thermal spray coating, a metallurgically determined surface temperature was maintained during the laser heat treatment, by real-time control of the laser power. In other words, nonhomogeneities in the macrosegregation of certain alloying elements, and voids in the as-sprayed state, could be improved. The main microstructural features of the Metco-16C coating laser-heat-treated at 1423 K were nanosized (100–150 nm) Cr5B3, M7C3, and M23C6 precipitates with a lamellar structure of Ni (FCC) and Ni3Si as the matrix phase. Those of the laser heat-treated Stellite- 1 coating at 1473 K were fine (30–250 nm) precipitates of WC, M7C3, and M23C6 based on a Co (FCC) matrix. The results show that laser heat treatment at 1423 K increased the hardness of the Mecto-16C coating to 1115 HV from the as-sprayed state (754 HV), while treatment at 1473 K increased the hardness of the Stellite-1 coating from 680 HV to 860 HV.

Effect of laser heat treatment on the mechanical properties and the fracture of case-hardened steel

1991 ◽  
Vol 33 (8) ◽  
pp. 625-630
Author(s):  
V. M. Goritskii ◽  
D. P. Khromov ◽  
K. B. Botvinnikova ◽  
V. S. Avanesov ◽  
B. A. Averbukh ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Hardened Steel ◽  
Laser Heat Treatment ◽  
Laser Heat

Research about Relation between the Microstructures and Mechanical Properties of Metal Coating Layers

2014 ◽  
Vol 216 ◽  
pp. 169-174
Author(s):  
Arthur Olàh ◽  
Mircea Horia Tierean
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Wear Resistance ◽  
Chemical Composition ◽  
Metal Coating ◽  
Laser Heat Treatment ◽  
Laser Heat ◽  
Coating Layers ◽  
Microstructures And Mechanical Properties

The paper presents the research about the correlation between the microstructures and mechanical properties of metal coating layers after laser heat treatment. The research was made with eight types of electrodes for welding coating. Laser heat treatment was applied after coating. Evaluation of results was made by observing the microstructures with metallographic microscopy, SEM/EDX and the mechanical properties were obtained by microhardness and wear resistance. The goal of this research is to study the influence of the laser heat treatment on wearing resistance of metal coating layers. Results reveal the influence of microstructures and chemical composition of used electrodes on microhardness and wear resistance of metal coating layers.

scholarly journals Mechanical Properties of Metal Coating Layers after Laser Heat

2020 ◽  
Vol 21 (2) ◽  
pp. 72-77
Author(s):  
Arthur Olah
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Wear Resistance ◽  
Chemical Composition ◽  
Metal Coating ◽  
Laser Heat Treatment ◽  
Laser Heat ◽  
Coating Layers

The goal of this research is to study the influence of the laser heat treatment on wearing resistance of metal coating layers. Results reveal the influence of microstructures and chemical composition of used electrodes on microhardness and wear resistance of metal coating layers. Laser heat treatment was applied after coating. Evaluation of results was made by observing the microstructures with metallographic microscopy, SEM/EDX and the mechanical properties were obtained by microhardness and wear resistance.

scholarly journals Correlation between Microstructure and Tribological Properties of Laser Surface Heat-Treated Stellite Coatings

Coatings ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 433
Author(s):  
Chang-Kyoo Park ◽  
Jung-Hoon Lee ◽  
Nam-Hyun Kang ◽  
Eun-Joon Chun
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Tribological Properties ◽  
Superior Performance ◽  
Laser Heat Treatment ◽  
Continuous Casting Mold ◽  
Heat Treated Sample ◽  
Laser Heat ◽  
Heat Treated ◽  
Sprayed Coating

To manufacture superior-performance continuous casting mold components, high-velocity oxygen fuel spraying of a Stellite-1 coating was followed by its laser heat treatment at 1373–1473 K using a diode laser. The effects of the laser irradiation conditions on the macro- and microstructural variations along with the hardness and wear resistance within the Stellite-1 coating were evaluated. After the heat treatment, micro-voids within the sprayed coating decreased in number slightly with an increase in the heat treatment temperature. The hardness of the sprayed Stellite-1 coating increased from that of the as-sprayed coating (680 HV) after the laser heat treatment, with a hardness of 860 HV obtained at 1473 K. The cause of the increase in hardness could be the formation of nano-sized W- and Cr-based carbides such as WC, M7C3, and M23C6, as suggested by transmission electron microscopy analysis. The tribological properties of as-sprayed and laser heat-treated samples were investigated by a pin-on-disk tribometer. The laser heat treatment of Stellite-1 coating enhanced wear resistance. This resulted in a lower coefficient of friction and wear rate for the laser heat-treated sample than those for the as-sprayed sample.

Enhancing Mechanical Properties and Formability of AISI 301LN Stainless Steel Sheet by Local Laser Heat Treatment

2013 ◽  
Vol 554-557 ◽  
pp. 885-892 ◽  
Author(s):  
Antti Järvenpää ◽  
Matias Jaskari ◽  
Pentti Karjalainen ◽  
Mikko Hietala
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Laser Beam ◽  
Laser Treatment ◽  
Strength Properties ◽  
Coarse Grained ◽  
Laser Heat Treatment ◽  
Austenite Grain Size ◽  
Laser Heat ◽  
Ultrafine Grained

This study demonstrates applying local laser heat treatment to produce ultrafine-grained austenite (UFGA) structures in an AISI 301LN type commercial austenitic steel. Pieces of 50% cold-rolled sheets containing more than 90% strain-induced martensite were heated locally by a laser beam to various peak temperatures to obtain different degrees of martensite reversion to austenite. Mechanical properties and formability of grain-refined and coarse-grained structures were measured by tensile and Erichsen cup tests. In addition to standard Erichsen cup test, additional interrupted tests were carried out, where cups were first stretched close to the critical strain. Drawn cups were then heated locally by a laser beam to revitalize the structure and thereby enhance the formability in the following cupping test until failure. Results showed that local laser heat treatment is suitable for the reversion treatment to refine the austenite grain size. Various structures were produced: completely reverted microstructures (T > 700 °C) with grain sizes 0.9 - 2 µm in addition to partially reverted structure (T < 700 °C) containing nano- and ultrafine-grained austenite (0.6 µm) with some martensite. The grain refinement by local annealing improved the strength properties. The Erichsen cup tests showed that the formability was equal in the completely reverted ultrafine-grained structures to that of the coarse-grained sheets. It was demonstrated that the local laser treatment restored formability of the drawn cups, allowing stretching to be continued. The second forming step after the laser-treatment provided an enhancement of 19 and 14% in the cup depths in coarse-grained and ultrafine-grained steels, respectively, even though the laser-treatment parameters were not optimized yet.

Effect of selective laser heat treatment on geometrical variation in boron steel components: An experimental investigation

2020 ◽  
Vol 235 (1-2) ◽  
pp. 54-64
Author(s):  
Vaishak Ramesh Sagar ◽  
Kristina Wärmefjord ◽  
Rikard Söderberg
Keyword(s):  
Heat Treatment ◽  
High Strength ◽  
Boron Steel ◽  
Laser Heat Treatment ◽  
Laser Heat ◽  
Heat Treated ◽  
Geometrical Variation ◽  
And Performance ◽  
Boron Steels ◽  
Heating Direction

Selective laser heat treatment is a well-known process for its ability to produce tailor heat treated blanks (THTB). Specifically, ultra high strength boron steels with tailored material properties can be produced. However, this process generates unwanted distortion and influences geometrical variation. This in turn can affect functionality, aesthetics, and performance of the final product. Understanding the effects on geometrical variation in the final product or the assembly will enable in designing and producing geometry assured products. In this paper, boron steel blanks were selectively laser heat treated with a specific heat treatment pattern and laser heating direction sequence. These heat treated blanks were then cold formed. Further on, spot welding simulation of the cold formed parts was performed to assess the effect on geometrical variation at the assembly level. The results show that the effect of selective laser heat treatment on geometrical variation at part level propagates further to the assembly level. It implies that the effect on geometrical variation should be minimized at part level, when the blanks are laser heat treated. Hence, the sources that influence geometrical variation at part level when employing selective laser heat treatment are presented and discussed. The motivation and possibilities to minimize the effects in the early design concept stages is provided.

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