BazTech - Yadda

1

Effect of Processing Conditions on Forgeability and Properties of Hot and Warm-Forged Steel 300M

Skubisz P., Łukaszek-Sołek A.

Archives of Metallurgy and Materials

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2017

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Vol. 62, iss. 4

2247--2254

EN

Results of investigation of the effect of processing conditions of medium-carbon alloy steel AISI 300M on forgeability and microstructure-properties are presented here, including as-forged and heat treated condition of the material. The presented results concern two vital aspects of plastic forming of high-duty impression-die forgings, which underlay a selection of technological conditions which enable the accomplishment of the required quality of the forged part. These are: firstly, the microstructure and mechanical properties and their uniformity within a part and secondly, technological realization of forging the required geometry in the given processing conditions. In order to define a favourable processing window, dynamic behaviour modeling in variable forging conditions was carried out, establishing a coefficient of energy dissipation η% and the metal flow instability areas, which indicated the temperature regime and strain rate range for the forging process. The constructed processing maps were subject to experimental verification in the die-forging tests, carried out on a screw press. Hot and warm forging conditions were applied accordingly to selected areas of the processing maps, representative for unique forging conditions occurring in the industrial practice.

2

The research of forgeability of magnesium alloy at warm forming temperatures

Kapustova M., Sobota R., Bilik J.

Hutnik, Wiadomości Hutnicze

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2016

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Vol. 83, nr 9

410--412

EN

The presented contribution is aimed at research of temperature influence on workability of a selected magnesium alloy at temperature interval for warm forming. The magnesium alloy type AZ31 was selected for experimental purposes. The mentioned alloy is used for production of drop forgings. In order to consider forgeability, Židek´s pressure test at warm conditions was selected and used as technological test. The author of mentioned test recommends cylinder shaped test sample with four notches. For magnesium alloy AZ31 hot forming at temperature interval from 250°C to 425°C is recommended. The pressure tests were conducted within the temperature interval of 200−350°C, i. e. at temperatures belonging to lower limit of recommended temperature interval, in order to acquire as much information as possible on behaviour, plasticity and formability of magnesium alloy at lower forming temperatures.

PL

Zakres niniejszej pracy dotyczy wpływu temperatury na kowalność stopów magnezu. Wybrany do badań Stop AZ31 jest kształtowany w procesach kucia, czego efektem jest wytwarzanie odkuwek o zróżnicowanych kształtach. Biorąc pod uwagę kowalność do badań, wybrano metodę testu ciśnieniowego w podwyższonej temperaturze. Autorzy tej metody zalecają badania próbek w kształcie walca z czterema karbami. Dla badanego stopu zaleca się temperaturę obróbki plastycznej w przedziale 250°C do 425°C. Test ciśnieniowy przeprowadzono w zakresie temperatury od 200−350 °C, ze względu na analizę zachowania się stopu podczas kształtowania w temperaturze z dolnego zalecanego zakresu przeróbki plastycznej.

3

Precision forging of thin-walled parts of AZ31 magnesium alloy

Skubisz P., Sińczak J.

Archives of Metallurgy and Materials

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2007

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Vol. 52, iss. 2

329-336

EN

Tests of closed-die forging in various temperatures, ranging from 350 to 150°C were performed with a use of high speed forging equipment. As research material as-cast and as-extruded AZ31 alloy was used. After successful efforts in 250°C, additional spring-attached tool was used to exert hydrostatic state of stress, which allowed decreasing forging temperature. The experiments were supplemented with numerical analysis, which helped to estimate the level and state of stress during forging, explaining origin of reported defects.

PL

Przeprowadzono próby kucia w matrycach zamkniętych w różnych temperaturach kucia, w zakresie od 350 do 150°C. Jako materiał do badań użyto stop magnezu AZ31 w stanie lanym oraz po wyciskaniu. Po udanych próbach przeprowadzonych w 250°C, zastosowano dodatkowe narzędzie podtrzymywane sprężyną, które wprowadzając naprężenia ściskajace pozwoliło na obniżenie temperatury kucia. Doświadczenia wspomagano modelowaniem numerycznym, które pozwoliło okreslić wielkość i stan naprężeń w odkuwce podczas kucia oraz wyjaśnić pochodzenie zaobserwowanych defektów.