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2 Zeszyty Naukowe. Mechanika / Politechnika Opolska

2 2008

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Optimization of forming temperature of 100CrMnSi6-4 bearing steel under partial heating

Doležal P., Zapletal J., Klakurková L., Švejcar J.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

2008

z. 92

65-65

The paper focuses on problems of optimizing the forming temperature of grade 100CrMnSi6-4 bearing steel under partial heating. In order to assess its formability, tensile tests at elevated temperatures ranging from 100 to 800 °C were carried out. Tensile diagrams revealed jump changes of mechanical properties in the brittle region under blue heat and in the region of phase transformations. Experimental examination was then concentrated on assessing the plastic deformation capability of the material under pressure at elevated temperatures, by means of the upsetting test. Another goal of the paper consisted in comparing the two experimental methods chosen for establishing the optimum temperatures of forming grade 100CrMnSi6-4 bearing steels at elevated temperatures. To have a complex assessment of the experimental material the structure and phase analyses of the bearing steel were performed in dependence on heating temperature.

Establishing optimum forming temperature of 100CrMo7-3 bearing steel under partial heating

Klakurková L., Doležal P., Zapletal J., Švejcar J.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

2008

z. 92

73-73

The forming process is associated with the plastic deformation capability of materials. The formability of metals and alloys is influenced by physical-metallurgical properties of material and by external forming conditions, forming temperature in particular. A kind of borderline for the division of forming is the recrystallization temperature, according to which forming is divided into cold forming, partially hot forming and hot forming. The paper is concerned with problems of optimizing the temperature of forming grade 100CrMo7-3 bearing steel under partial heating. Experimental establishment of the optimum range of forming temperatures was based on the results of tensile testing at elevated temperatures from 100 to 800 °C. Experimental verification of the behaviour of bearing steel under pressure was conducted via the upsetting test at elevated temperatures. The experimental part of the work is also concerned with the analysis of phase composition of grade 100CrMo7-3 bearing steel using computer simulation, and by the verification of simulation via metallographic evaluation.