The effect of external magnetic flux field in the QTS weldment on the change of fatigue crack propagation behaviors

Sugiarto, Sugiarto; Soenoko, Rudy; Purnowidodo, Anindito; Irawan, Yudy Surya

doi:10.15587/1729-4061.2018.122919

Cited by 1 publication

(1 citation statement)

References 17 publications

(26 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1) V. D. Sadovsky (1986) calls "some" [2], and A. M. Belous et al [3] it is associated with the release of an unknown non-magnetic or low-magnetic phase [4,5,6]. The authors [7,8] associate the decrease in the I of the tempering products at 275 -350°C after quenching with the Curie point of cementite, which is hardly true, since the I of isolated cementite, according to B. G. Livshits [9] grows to 180°C (Fig. 1, cr.…”

Section: Introductionmentioning

confidence: 99%

Rationale for signs of transformation in iron near 200°C

2022

View full text Add to dashboard Cite

The analysis of the literature data on the properties of iron and steels carried out in this work indicates numerous anomalies of physical and mechanical properties near a temperature of ≈200°C. Based on the thermal effect, changes in magnetic properties, anomalies of shear modulus, oxidizability, heat capacity, diffusion, Lorentz number, the transformation in iron at ≈200°C is justified, which may be the cause of a decrease in the magnetization of perlite, sorbitol and martensite, as well as the performance of high-hard low-tempered steel having almost the same hardness after quenching. The study was carried out on samples of practically pure iron (0.008 % C). The experiment (metallographic examination, X-ray diffraction analysis, metal deformation resistance (Gleeble-3800 installation) was carried out every 20 -40°C. The experimental results indicate significant changes in the structure, as well as extreme values of the mechanical properties of iron (0.008 % C) and steels near a temperature of ≈200°C, which makes it possible to declare the transformation in iron and its derivatives -steels at this temperature. Recognition of the transformation at this temperature allows us to explain: the reason for the decrease in magnetization of perlite, sorbitol and martensite, the maxima of impact strength and hardness of iron, the disappearance of the yield point on the tensile curve of riveted steel after aging, the nature of irreversible tempering fragility (the nature of the latter, as well as reversible is still debatable), etc.

show abstract

Section: Introductionmentioning

confidence: 99%