This paper presents a study on the room-and low-temperature impact toughness of hypoeutectoid steels with ferritepearlite structures. Six kinds of hypoeutectoid steel specimens were fabricated by varying the carbon content and austenitizing temperature to investigate the effect of microstructural factors such as pearlite volume fraction, interlamellar spacing, and cementite thickness on the impact toughness. The pearlite volume fraction usually increased with increasing carbon content and austenitizing temperature, while the pearlite interlamellar spacing and cementite thickness mostly decreased with increasing carbon content and austenitizing temperature. The 30C steel with medium pearlite volume fraction and higher manganese content, on the other hand, even though it had a higher volume fraction of pearlite than did the 20C steel, showed a better low-temperature toughness due to its having the lowest ductile-brittle transition temperature. This is because various microstructural factors in addition to the pearlite volume fraction largely affect the ductile-brittle transition temperature and lowtemperature toughness of hypoeutectoid steels with ferrite-pearlite structure. In order to improve the room-and low-temperature impact toughness of hypoeutectoid steels with different ferrite-pearlite structures, therefore, more systematic studies are required to understand the effects of various microstructural factors on impact toughness, with a viewpoint of ductile-brittle transition temperature.
1) =Abstract =Purpose: This study aimed to investigate the awareness and direction of paramedics work and image in hospitals.Methods: From April 16 to May 5, 2015, data were collected through structured questionnaires from 45 paramedics and 81 nurses working in emergency medical institutions. The data were analyzed using SPSS version 18.0.Results: The work of paramedics is evaluated to be highly worthy at the in-hospital level rather than at the injury first-aid treatment level. It appears that paramedics are often forced to do what their hospitals tell them to do concerning matters related to conflicts with them and nurses. Paramedics stated that they experienced greater mental stress than those engaging in other professions, a finding similar to those of other studies. There was no statistically significant difference in opinions between the two groups about a desirable direction for the development of first-aid services at hospitals. More
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