Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 21 for “"impact toughness"”.
-
The impact toughness of iron manganese alloys.
… boundaries. The present investigation shows that impact toughness can be improved by tempering to produce small amounts of reverted austenite into the structure. In quantifying the percentages of reverted austenite in these structures. X-ray and Mossbauer studies have shown that the phase analysis …
-
Effect of Microstructure on Mechanical Properties of High Strength Steel Weld Metals
… testing, it was confirmed that a large gain in impact toughness could be achieved by reducing the manganese content. Carbon additions were found to increase strength with only a minor loss to impact toughness as predicted by the modelling. The highest yield strength (912 MPa) in combination with …
-
Structure and properties of carbon fibre reinforced aromatic thermoplastics
… compressive mechanical properties, fracture and impact toughness, and creep behaviour of these composites were determined, as a function of particle size. Finally, the potential for moulding was assessed. Results from tensile and flexural tests show that the variations in the tensile and flexural …
-
Ductility in high chromium super-ferritic alloys
… but their use has been hampered by inadequate toughness at ambient temperatures. Brittle cleavage of the alloys is a consequence of the high resistance to plastic flow required to accommodate local stresses, such as those found ahead of a loaded crack. Once initiated, a crack propagates in a …
-
Assessment of the effect of grain refinement on the solidification characteristics of Al-Si-Cu eutectic cast alloy using thermal analysis technical (CA-CCTA)
… The mechanical properties, such as hardness and impact toughness of base alloy, were improved with the additions of TiB5 by not more than 4.8 wt.%., where by lower strength and impact toughness were observed due to the intermetallic accompaniment with pore porosity defects, which increased by …
-
Effects of thermal aging on Stress Corrosion Cracking and mechanical properties of stainless steel weld metals
… micro-hardness, nano-hardness, Jic, and Charpy-impact toughness) was in process and initial results show an increase in yield strength and a decrease in fracture toughness after aging for 1000 hours at 430 and 400 *C. Thermal aging results in no discernable changes to the 6-ferrite morphology …
-
Microstructure and Mechanical Properties of WE43 Alloy Produced Via Additive Friction Stir Technology
… the base material in the T5 condition. The toughness measured by Charpy impact testing also showed an increase over the base material. The relationships among tensile properties, Vickers microhardness, impact toughness, microstructure and thermal history are developed and discussed.
-
Evaluating the Mechanical Properties and Fracture Behavior of Welded-Wire Reinforcement Using Tension and Charpy Tests and Sub-Size Charpy Corrections
… indicated that the cross-weld tended to increase impact toughness by up to 30 J (22 ft-lbf) as the longitudinal and transverse bars became closer in size. Experimental values are evaluated using statistical methods, discussed, and compared to specification minimums in American and European …
-
The influence of the thermomechanical processing on the annealing response of 3CR12 steel
… and microhardness tests, tensile tests and impact energy tests, dilatometry, differential thermal analysis and volume fraction analysis. Alloys in the as-rolled state exhibited an increase in martensite content related to an increase in the cooling rate following hot rolling. The increase in …
-
Characterization and recyclability of 304L stainless steel powder for use in the selective laser melting process
… reusability. In order to better understand the impact of ejecta on powder recyclability, samples of 304L laser spatter and condensate were characterized in terms of morphology, chemistry, and microstructure. Differences between ejecta and virgin powder were used as a basis for understanding the …
-
Correlação entre os ensaios de esclerometria pendular e método charpy para aços SAE 1080
… sought. One of the techniques to quantify the toughness of metallic samples is the Charpy method. However, the application of pendulum scratching test analyses to obtain properties such as toughness and dynamic hardness can be promising, due to its fast execution and low cost. Furthermore, it …
-
Rice straw fiber polymer composites: thermal and mechanical performance
… compatibilizers showed better strength and impact toughness, and acceptable modulus compared to those modified by either EPR or EPR-g-MA. It was found that 13% weight loss seemed to be the limit for rice straw to maintain its strength in a composite system. High-temperature one-step …
-
Evaluation of Cold Spray Process for Solid-State Welding
… HAZ, they exhibit lower tensile strength and impact toughness than TIG-welded counterpart due to the presence of ubiquitous microvoids resulting from inadequate metallurgical bonding in CSWed area. These microvoids act as initiation sites for microcracks. To guide future optimization efforts, …
-
Phase transformations in welded supermartensitic stainless steels
… to be more prone to δ- ferrite retention. Charpy impact toughness tests performed on simulated heat-affected zones revealed a weak effect of δ-ferrite on the HAZ ductile to brittle transition temperature. In fact, due to its larger grain size, the coarse-grained HAZ determined the impact …
-
Complex Mechanical Properties of Steel
… are important but fall into this category are impact toughness, fatigue, creep and combinations of these phenomena. The work presented in this thesis is an attempt to progress in this area of complex mechanical properties in the context of steels, although the outcomes may be more widely …
-
Quenching and partitioning plate steel for wear and toughness applications
… steel plates with increased wear resistance and toughness for use in the mining and earth moving industries. This work investigates the application of Q&P heat treatments to 18 mm thick low-alloy steel plates to obtain microstructures containing martensite and retained austenite (RA) that are …
-
Influence of crystallographic texture in X70 pipeline steels on toughness anisotropy and delamination
… and their relation to planar anisotropy of toughness and delamination were evaluated. The experimental steels were processed through either a hot strip mill, a Steckel mill, or a compact strip mill. Different processing routes were selected to obtain plates with potential variations in the …
-
Influences on nanocomposite structural performance: experimental study on materials processing and bonding
… The<br/>rheological, mechanical and fracture toughness properties were tested in epoxy resin with<br/>different nanotube loadings. These properties were explored in a brittle and a flexible resin,<br/>achieved by using two amine curing agents. The covalently bonded tubes showed<br/>Newtonian …
-
Doing the Dishes: A Comprehensive Analysis of the Late Bronze Age Ceramics Excavated from Hut 12 at Mokarta, Sicily
… to determine a vessel’s fracture strength, impact toughness, and resistance to thermal shock. The analysis of use-alteration, identifying abrasions, chipping, spalling or pitting, and sooting and attrition patterns, provided evidence to categorize such primary and sometimes secondary …
-
Weldability and hydrogen relationships in super duplex stainless steel.
… other mechanical properties, such as charpy impact toughness, elongation, and reduction in area of these materials.
Page 1 of 2