Dilatometry

Hunkel, M.; Surm, H.; Steinbacher, M.

doi:10.1016/b978-0-444-64062-8.00019-x

Cited by 26 publications

(13 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The transformation kinetics were analyzed by the curves of the dilatation and the dilatation rate with respect to the temperature

during the heat treatment. The latter one shows the effects more pronounced [ 14 ]. In the curves of the dilatation rate, transformations are observed as positive or negative peaks, where the thermal expansion coefficient defines the baseline.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Comparative Study of the Tempering Behavior of Different Martensitic Steels by Means of In-Situ Diffractometry and Dilatometry

et al. 2020

Self Cite

View full text Add to dashboard Cite

Martensitic steels are tempered to increase the toughness of the metastable martensite, which is brittle in the as-quenched state, and to achieve a more stable microstructure. During the tempering of steels, several particular overlapping effects can arise. Classical dilatometric investigations can only detect effects by monitoring the integral length change of the sample. Additional in-situ diffractometry allowed a differentiation of the individual effects such as transformation of retained austenite and formation of cementite during tempering. Additionally, the lattice parameters of martensite and therefrom the tetragonality was analyzed. Two low-alloy steels with carbon contents of 0.4 and 1.0 wt.% and a high-alloy 5Cr-1Mo-steel with 0.4 wt.% carbon were investigated by dilatometry and in-situ diffractometry. In this paper, microstructural effects during tempering of the investigated steels are discussed by a comparative study of dilatometric and diffractometric experiments. The influence of the chemical composition on the tempering behavior is illustrated by comparing the determined effects of the three steels. The kinetics of tempering is similar for the low-alloy steels and shifted to much higher temperatures for the high-alloy steel. During tempering, the tetragonality of martensite in the steel with 1.0 wt% carbon shifts towards a low carbon behavior, as in the steels with 0.4 wt.% carbon.

show abstract

“…The transformation kinetics were analyzed by the curves of the dilatation and the dilatation rate with respect to the temperature

Section: Methodsmentioning

confidence: 99%

“…Microstructure evolution in steels is widely studied by dilatometry [ 14 ] or differential scanning calorimetry [ 2 ]. The advantages are a straightforward procedure and a high resolution.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of the Tempering Behavior of Different Martensitic Steels by Means of In-Situ Diffractometry and Dilatometry

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Concentration of test inhibitor in styrene was 0.025 wt%. The thermopolymer content was determined by a dilatometric technique [9]. The inhibitor and styrene were loaded into a clean dry dilatometer and deaerated with nitrogen for 5 min.…”

Section: Inhibition Testmentioning

confidence: 99%

Thermopolymerization inhibitors generated via radiolysis of lignin

et al. 2018

View full text Add to dashboard Cite

The pyrogenic conversion of lignin to a phenolic tar can be significantly enhanced by combining dry distillation with simultaneous electron-beam treatment of lignin. The tar produced by the combined method contains three times more benzenediols in comparison with conventional pyrogenic distillation method. As shown, the tar of radiation-thermal origin can inhibit the thermopolymerization of certain monomers, such as styrene. The inhibiting ability of tar exceeds that of synthetic phenolic inhibitors. In the presence of 0.025 wt% of the tar, the induction period of styrene thermopolymerization at 120 °С is at least 120 min. Radiation-thermal formation of phenolic tar obeys the chain mechanism and thereby, is a highly efficient process.

show abstract

“…Materials for production of screws undergo various production technologies to improve their properties but the inadequate selection of material as well as inappropriate manufacturing procedure can lead to the damage or rupture as well as subsequent fracture or failure of the material [ 3 ]. This type of introduced structural parts or components is mainly exposed to a particular cyclic loading and this mentioned fact has to be taken into account in relation to the selection and testing procedure of the material [ 3 , 4 ]. Highway information boards or signposts often have a greater weight as well as geometric dimensions.…”

Section: Introductionmentioning

confidence: 99%

“…Considering the fact mentioned hereinbefore, it is important to pay attention to the geometric and material aspects of screw processing in order to avoid the rupture and failure, relating to the whole cross-section of screw because the given phenomenon could lead to the shear stress effect on the lower number of operating cross-sections of the remaining screws [ 5 , 6 , 7 , 8 ]. In this mentioned case, an unstable screw joining could occur and the information board could fall on the road during traffic and it could have fatal consequences [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Fracture Analysis of High-Strength Screw for Highway Construction

Dubec

Kováčiková²,

Krmela³

et al. 2021

Materials

View full text Add to dashboard Cite

High-strength screws represent one of the main joining or fastening components which are commonly used in the process of installation of frame constructions for information boards or signposts, relating to the traffic roads. The control of the production process may not always be a sufficient method for ensuring road safety. The backward investigation and control of the screw material processing seems to be the one of the most important procedures when there is the occurrence of any failure during the operation of the screw. This paper is mainly focused on the analysis of the failure of the high-strength screw of 10.9 grade with M diameter of 27 × 3 and a shank length of 64 mm. The mentioned and investigated screw was used as a fastener in a highway frame construction. In the paper, there is mainly the analysis of the material for a broken screw in terms of the material micropurity, the material microstructure, the surface treatment as well as chemical composition. The evaluation was based on investigation by optical microscopy, scanning electron microscopy and energy dispersive spectroscopy. Important knowledge and results were also obtained due to information on micromorphology and material contrast of the fracture surface resulting from fractographic analysis, using the method of scanning electron microscopy. In the case of the production of the high-strength screws, the tempering stands for the decisive or crucial process of heat treatment because the given process can ensure a decrease in hardness, while the required ductile properties of the material are kept and this is also reflected in the increase of strength and micromorphology of the fracture surface. From the aspect of micropurity, inclusions of critical size or distribution were not identified in the material, referring to Czech standard ČSN ISO 4967 (420471). The microstructure corresponds to tempered martensite, but the fracture surface of the broken screw was based on an intercrystalline micromechanism, which is undesirable for the given type of component. Combined with the measurement of the HV1 (Vickers hardness at a load of 1 kg) from the edge to the central area of the screw, the analysis revealed the significant drawbacks in the heat treatment of the high-strength screw.

show abstract

Dilatometry

Cited by 26 publications

References 48 publications

Comparative Study of the Tempering Behavior of Different Martensitic Steels by Means of In-Situ Diffractometry and Dilatometry

Comparative Study of the Tempering Behavior of Different Martensitic Steels by Means of In-Situ Diffractometry and Dilatometry

Thermopolymerization inhibitors generated via radiolysis of lignin

Fracture Analysis of High-Strength Screw for Highway Construction

Contact Info

Product

Resources

About