Temperature Resistance of Magnetoelastic Characteristics of 13CrMo4-5 Constructional Steel

Abstract

In the paper the results of investigation on tensile stresses dependence of magnetoelastic characteristics of cores made of 13CrMo4-5 constructional steel are presented. In the investigation step-cooling test treated samples were used. The step-cooling test process is a type of heat treatment simulating eects of passing time and environmental conditions (temperature and stress) on the sample. In the paper the method of testing the inuence of stresses on the magnetic characteristics is presented. Frame shaped samples ensured a closed magnetic circuit and homogeneous distribution of stress. It was found that step-cooling test does not signicantly inuence the magnetoelastic characteristics and the structure of the samples. On the other hand, then tensile stresses signicantly change the magnetic characteristics of 13CrMo4-5 constructional steel. That conrms the possibility of using measurements based on the magnetoelastic eect in the stress assessment for industrial non destructing testing of steel constructions.

Tensductor—Amorphous Alloy Based Magnetoelastic Tensile Force Sensor

“…The presented characteristic (Figure 13) is near-linear and monotonous, as opposed to recently published magnetoelastic sensors [16,17], which have nonlinear response, mostly due to Villari reversal point [9]. Measurement range is scalable with sensor geometry according to Equation (5), and allows for low-level force measurements.…”

The Diagnostics of Power Boilers in Terms of Their Sustainability

“…Brodecki et al [24] and Tuz et al [25] also used light microscopy to observe the structure of steels operating at elevated temperatures for long periods of time. Jackiewicz et al [8] described structures obtained by heat treatment simulating the degradation conditions in industrial environments. The obtained material exhibited a ferrite-carbide structure, with clearly visible grains of primary pearlite, in which there was an effect of lamellar structure decomposition.…”

“…The chromium-molybdenum steel 13CrMo4-5 [6] is commonly used in the energy industry [7] for the construction of critical infrastructure elements, e.g., as a material for steam pipelines [8], due to its favorable mechanical properties [9]. Therefore, the creep resistance or corrosion resistance of this type of steel is extensively tested, taking into account various operating conditions, such as temperature, pressure, or environment [9].…”

“…On the other hand, Retschitzegger et al [14] stated that steel P91 seems to be a more suitable material than 13CrMo4-5 for wood chip-fired CHP plants utilizing high flue gas temperatures above 800 • C for the superheater inlet. Among the various available research methods used to test elements after long-term operation, apart from methods for testing mechanical properties, the most frequently used are LM [8,15], SEM [9,12,15], and XRD [15][16][17].…”

Nonlinear fatigue life prediction model based on the theory of the S‐N fatigue damage envelope

“…For such items as steam heater coils, plates for boiler drums and pressurized vessels, forgings and bars for boiler parts, pressurized vessels and turbines and pipelines of superheated steam, 15HM (13CrMo4-5) is commonly applied. [46][47][48] Meanwhile, A387 GR 22 (10CrMo9-10) is commonly used in seamless pipes for steam conditions reaching high temperatures, such as pressurized parts of boilers powered by fossil fuels and heat recovery system generators. 49,50 A336 GR 5 can also be found to be applicable in the same domain.…”