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Вид документа : Статья из журнала
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Автор(ы) : Gordienko A. I., Derevyagina L. S., Malikov A. G., Orishich A. M., Surikova N. S., Volochaev M. N.
Заглавие : The effect of the initial microstructure of the X70 low-carbon microalloyed steel on the heat affected zone formation and the mechanical properties of laser welded joints
Место публикации : Mater. Sci. Eng. A. - 2020. - Vol. 797. - Ст.140075. - ISSN 09215093 (ISSN), DOI 10.1016/j.msea.2020.140075
Примечания : Cited References: 32. - Microstructural studies and mechanical tests of laser welds were performed within the frame of the Fundamental Research Program of the State Academies of Sciences for 2013?2020, line of research III.23.1.1. Part of the research related to the selection of optimal laser welding parameters for low carbon steels was carried out within Basic State Project No. AAAA-A17-117030610122-6. TEM studies were carried out in Center of Federal Research Center of Kirensky Institute of Physics SB RAS. The authors are grateful to I.P. Mishin. for assistance in cross-helical rolling of the steel
Аннотация: In this paper, the heat affected zone (HAZ) of laser welded joints of the X70 steel were studied by the transmission electron microscopy method. The effect of the initial microstructure (coarse-grained hot-rolled and fine-grained after cross-helical rolling) on the HAZ formation and the mechanical characteristics of the welded joints were shown. It was found that the microstructure in the inter-critical HAZ of the steel after cross-helical rolling was more dispersed, homogeneous, and uniform compared to that of the coarse-grained hot-rolled one due to the initial fine-grained ferrite-bainitic-pearlite microstructure and the absence of pronounced ferrite-pearlite banding in the base metal. The character of the microhardness value distribution in the HAZ of the steel after cross-helical rolling was smooth with the gradual decrease from 370 down to 185 HV as shifted towards the base metal. In the HAZ of the coarse-grained hot-rolled steel, the heterogeneous microhardness value (up to 640–670 НV) distribution was revealed. The reason was the upper degenerate bainite microstructure with high residual stresses, characterized by laths up to 2.0–2.5 μm long and a high martensitic-austenitic constituent fraction (10–16%) of a slender shape along the boundaries of bainite laths. The conclusion was drawn that one of the ways to reduce the brittleness of the laser welded joints could be using the initially fine-grained steels possessing the homogeneous (mainly bainitic) microstructure.
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Вид документа : Статья из журнала
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Автор(ы) : Derevyagina L. S., Gordienko A. I., Surikova N. S., Volochaev M. N.
Заглавие : Effect of helical rolling on the bainitic microstructure and impact toughness of the low-carbon microalloyed steel
Место публикации : Mater. Sci. Eng. A. - 2021. - Vol. 816. - Ст.141275. - ISSN 09215093 (ISSN), DOI 10.1016/j.msea.2021.141275
Примечания : Cited References: 43
Аннотация: Ferrite-bainite microstructures and impact toughness of the X65 low-carbon microalloyed steel were investigated after helical rolling at 1000, 920, 850, and 810 °C followed by continuous cooling in air. After helical rolling at 1000 °C, granular bainite with large areas of the massive-shape martensite-austenite constituent (d = 1.5 μm) and a high fraction of twinned martensite (d › 2.0 μm) were observed in the steel. This caused a decrease in impact energy at low test temperatures (for example, 70 J at –70°С). Lowering the helical rolling temperature contributed to a reduction of dimensions of both ferrite-bainite and martensite-austenite constituent areas, as well as the replacement of the latter by a slender type one and an improvement in fracture toughness at the low temperatures. The highest impact energy level (210 J at –70 °C) was achieved after helical rolling at 850 °C due to the formation of a homogeneous microstructure, which included dispersed ferrite grains, granular bainite and small fractions of the slender type martensite-austenite constituent (d = 0.1–0.7 μm). In this case, areas of twinned martensite were absent.
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