On the basis of analysis of low carbon steel fracture macro-features and micro-processes atlow temperature,the definition was given of the characteristic transition temperature ofbrittleness,T<sub>pm</sub>...On the basis of analysis of low carbon steel fracture macro-features and micro-processes atlow temperature,the definition was given of the characteristic transition temperature ofbrittleness,T<sub>pm</sub>,and its physical meaning was expounded.Discussion was carried out of phys-ical characteristic of variation at T<sub>pm</sub> in respect of the fracture toughness and property ofcrack arrest.In addition,research was made on the application of T<sub>pm</sub>,which can give infor-mation about the transition of the fracture toughness,the property of crack arrest and criticalcrack size,to estimation the brittleness of low carbon steel at low temperatures.展开更多
Micro-alloying of Mg,ranged from 30 to 70 ppm,may improve the high temperatureductility,stress rupture,especially,certain important mechanical properties,such as cyclicstress rupture,creep/fatigue interaction and crac...Micro-alloying of Mg,ranged from 30 to 70 ppm,may improve the high temperatureductility,stress rupture,especially,certain important mechanical properties,such as cyclicstress rupture,creep/fatigue interaction and crack propagation rate.The quantity,morphology and distribution of δ-phase may obviously influence the notched cyclic stress rup-ture life.The relevant microstructure shows that the Mg may also influence to certain extenton the feature of δ-phase.Thus,to keep the Mg and δ-phase under control may further im-prove the mechanical properties of alloy GH169.展开更多
文摘On the basis of analysis of low carbon steel fracture macro-features and micro-processes atlow temperature,the definition was given of the characteristic transition temperature ofbrittleness,T<sub>pm</sub>,and its physical meaning was expounded.Discussion was carried out of phys-ical characteristic of variation at T<sub>pm</sub> in respect of the fracture toughness and property ofcrack arrest.In addition,research was made on the application of T<sub>pm</sub>,which can give infor-mation about the transition of the fracture toughness,the property of crack arrest and criticalcrack size,to estimation the brittleness of low carbon steel at low temperatures.
文摘Micro-alloying of Mg,ranged from 30 to 70 ppm,may improve the high temperatureductility,stress rupture,especially,certain important mechanical properties,such as cyclicstress rupture,creep/fatigue interaction and crack propagation rate.The quantity,morphology and distribution of δ-phase may obviously influence the notched cyclic stress rup-ture life.The relevant microstructure shows that the Mg may also influence to certain extenton the feature of δ-phase.Thus,to keep the Mg and δ-phase under control may further im-prove the mechanical properties of alloy GH169.
