It is made a comparison of functions approximating the main magnetization curve electrical steels, selected according to two criteria: obtaining simplest expressions in an analytical study and achieving minimum calculation error quantitative calculations devices with ferromagnetic components. The cases are considered when elements operate at alternating current high values magnetic induction, t...

Although solidification cracking is not usually regarded as a serious problem when welding ferritic steels, improvements in the submerged arc welding process, using higher deposition rates and faster welding speeds, have led to welding conditions more likely to give cracking. Furthermore, the need to weld stronger tougher steels, where the inspection requirements are more stringent, has led to ...

Eddy current testing can be used to interrogate steels but it is hampered by the lift-off distance of sensor. Previously, point intersection (LOI) feature has been found for pulsed eddy (PEC) testing. In this paper, a invariant inductance (LII) proposed multi-frequency (MEC) testing, which merely targets ferromagnetic steels. That is, at certain working frequency, measured signal nearly immune ...

Traditionally, products of electrical SiFe steel are focussed on applications for frequencies 50–Hz. However, the recent developments electric drive systems yielded a strong extension range from f = 16 2/3 Hz up to ca. 500 Hz. In spite high industrial relevance, literature offers corresponding data material’s magnetic energy losses in very rare ways. This paper reports first comparative, multi-...

advanced high strength steels (ahss) have recently attracted great attention because of their superior mechanical properties. a modern group of these steels, known as twinning induced plasticity (twip) steels, shows a unique combination of strength and ductility even at high rates of strain. in order to examine the functionality of such steels in dynamic loading conditions, their mechanical beh...

Four compositions of austenitic Mn-Cr steels have been developed successfully for in-vessel component materials in power plant industry. The phase stability of these Mn-Cr steels was studied by and X-ray diffraction (XRD) patterns. XRD patterns have shown that the matrix of these Mn-Cr steels is a single γ-phase structure. The potentiodynamic polarisation curves suggested that these fabricated ...

The relationahip between streas-corroslon crftck velocity and cracktip stress intensity is discussed. In most high-strength steels there is a wide range of stress intensity over which crack velocity is essentially constant. Methods of estimating this velocity are described. Values for a variety of high-strength steels are presented and the effects of metallurgical variables are indicated. Impli...

Boron steels are used in hot stamping process due to their good mechanical properties. During the stamping process, the dies are exposed to aggressive conditions including adhesive wear, abrasion, thermal stresses and fatigue. In the present work, QRO 90 and UNIMAX slid against 22MnB5 steel in four conditions: with and without hardening treatment and, with and without Al–10%Si coating, in order...

Like all steel types, HSLA requires a definition and strict practical adherence to welding parameters in order to achieve the required weld quality. Different sources offer a varying array of welding parameters. Although their hierarchical importance can be disputed, their principal definition and practical adherence are prerequisites for the quality of welded joints 1,2 . The analysis of earli...