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Optymalizacja parametrów starzenia po zgniocie na zimno stali maraging oraz zbadanie dynamicznych właściwości mechanicznych stali na korpusy wytwarzane metodą zgniatania obrotowego na zimno

Burdek M., Marcisz J., Stępień J., Adamczyk M.

Prace Instytutu Metalurgii Żelaza

2010

T. 62, nr 4

55-58

W pracy wykonano kompleksowe badania mające na celu optymalizację parametrów starzenia po zgniataniu obrotowym na zimno stali maraging N18K9M5Ts i N18K12M4Ts oraz zbadano dynamiczne właściwości mechaniczne stali stosowanych na korpusy wytwarzane metodą zgniatania obrotowego na zimno, tj. stali maraging i 15HGMV).

In this work, comprehensive examinations were performed in order to optimise the ageing parameters after cold strain of N18K9M5Ts and N18K12M4Ts maraging steel and dynamic mechanical properties of steels used for bodies manufactured by flow forming, i.e. maraging and 15HGMV steel, were investigated.

Prediction of Duration Limited Exposure for Participants Wearing Chemical Protective Clothing in the Cold

Rissanen S., Rintamaki H., Holder I.

International Journal of Occupational Safety and Ergonomics

2000

Vol. 6, No. 4

451--461

The suitability of the IREQ (insulation required) index for predicting the thermal responses of 6 participants wearing chemical protective clothing was tested during exercise at -20 and -25 °C. IREQ was used to calculate duration limited exposure (DLE). Measured DLE correlated (r= .899, p < .001) with the predicted DLE. In exposures exceeding 40 min, however, the predicted DLE tended to be 10-20 min too short compared to the measured one. During short exposures the prediction was 5-20 min too long. The results show that IREQ overestimated the cold strain in participants wearing chemical protective clothing during cold exposures longer than 40 min. Nevertheless, predicted DLE never exceeded measured times and thus the prediction was always safe from the occupational point of view.