On the Participation of Hydrogen in the Formation of the Properties of Hypereutectic Al-Si Alloys

Afanasyev, V.K.; Popova, Marina; Malyuh, Marina; Dolgova, S.V.

doi:10.17212/1994-6309-2018-20.2-63-74

Cited by 2 publications

(2 citation statements)

References 5 publications

(5 reference statements)

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“…In the works [3,4,5,6] a new understanding of the philosophy of metallurgy, a new look at the formation of the dark and light in the nature and structure of metals, including cast iron (graphitedark and cementite -light) are considered. "...…”

Section: Research and Resultsmentioning

confidence: 99%

Influence of the Melt Treatment Method on the Properties of Cast Iron

Afanasyev

Сагалакова

Tankov

2021

SSP

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The article is devoted to studying the effect of liquid melt treatment with a substance having high affinity with hydrogen – lead-base silumin. Taking into account that gases (hydrogen, nitrogen and oxygen) are present everywhere, including alloys, a series of experiments was carried out on treating melt of blast furnace iron with substances having great affinity with hydrogen. It is established: when treating melt with lead-base silumin in the low-temperature test interval, there is a slight increase in the linear expansion coefficient (LEC) at 100°C, compared with the initial one, to 8.210-6, deg-1. In the temperature range of 100-150°C LEC decreases to a minimum value of 7.210-6, deg-1. In the average temperature range of 150-300°C, a sharp, anomalous increase is noticeable, compared with the initial one up to 15.5210-6, deg-1. When studying the microstructure of cast iron after processing the melt with lead silumin, the formation of ledeburite structure is stated. Samples treated with lead-base silumin were subjected to cementation by feeding water steam at 900°C for 1-5 hours. It should be noted that, in the temperature range of 50-150°C, the values of the linear expansion coefficient lie almost in a straight line in the entire field of study. The coefficient varies from 10.810-6, deg-1 at 50°C to 13.710-6, deg-1 at 450°C. Preliminary heat treatment of cast iron in the carburizer made by the Bondyuzhsky plant with water steam smoothes anomalies of LEC and increases its initial values, and grinds perlite and cementite as well. Subsequent quenching in water with a temperature of 1000°C significantly changes the linear expansion coefficient of cast iron. Hardening of samples after cementation sharply reduces the linear expansion coefficient in the test range of 150-200°C, and in the temperature range of 350-450°C negative values of LEC are observed. Thus, it can be concluded, that treating the melt with lead-base silumin, cementation in the medium of the carburizer made by the Bondyuzhsky plant and subsequent hardening leads to sharp changes of the linear expansion coefficient up to negative values. The identified properties suggest the possibility of using cast iron where it is necessary to constancy of LEC and there are no requirements for the weight of the product.

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Section: Research and Resultsmentioning

confidence: 99%

Influence of the Melt Treatment Method on the Properties of Cast Iron

Afanasyev

Сагалакова

Tankov

2021

SSP

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“…It was shown that the influence of the external environment is determined by the change in the ratio of the interstitial elements -hydrogen, nitrogen, oxygen and carbon -in the alloys. In articles [15][16][17] we showed that heat treatment in media with an increased content of hydrogen and nitrogen accelerates the course of phase transformations in aluminum and iron alloys, since it activates the diffusion of hydrogen in them.…”

Section: Introductionmentioning

confidence: 99%

Improving Strength of Structural Steels by Preheating in an Oxygen-Containing Medium

Afanasyev

Popova

Zhibinova

2019

MSF

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The results of the preliminary heat treatment effecting in a medium with a high oxygen content on the microstructure and mechanical properties of structural steels are presented. It is shown that the usage of preheating in the glass mass in the range of (Ac130°C) – Ac1for steels of grades 50 and 40H leads to the formation of a structure with dispersed granular pearlite and crushed excess ferrite precipitates. Such a structure, when heated for quenching, provides rapid formation of a homogeneous austenite and a delay in the growth of austenite grain, which provides the best combination of strength and plasticity after the final heat treatment. It is established that the tensile strength increases 1.2-1.3 times while maintaining the plasticity characteristics. The reliability of the obtained estimates of the mechanical property characteristics is confirmed by the results of a statistical analysis.

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On the Participation of Hydrogen in the Formation of the Properties of Hypereutectic Al-Si Alloys

Cited by 2 publications

References 5 publications

Influence of the Melt Treatment Method on the Properties of Cast Iron

Influence of the Melt Treatment Method on the Properties of Cast Iron

Improving Strength of Structural Steels by Preheating in an Oxygen-Containing Medium

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