For many years, the authors systematically summed up the previous studies, ex-plored the statistical characters of rock mass structure, and the mechanical characters,and developed the principle system of'Statistic...For many years, the authors systematically summed up the previous studies, ex-plored the statistical characters of rock mass structure, and the mechanical characters,and developed the principle system of'Statistic Mechanics of Rock Mass'. This notewill briefly introduce the primary principles of the theory.展开更多
The effect of hot rolling process on microstructure evolution,mechanical properties and stress corrosion cracking(SCC)resistance of high-strength low-alloy(HSLA)steels was investigated by varying the finish rolling te...The effect of hot rolling process on microstructure evolution,mechanical properties and stress corrosion cracking(SCC)resistance of high-strength low-alloy(HSLA)steels was investigated by varying the finish rolling temperature(FRT)and total rolling reduction.The results revealed granular bainite with large equiaxed grains was obtained by a total rolling reduction of60%with the FRT of 950℃(within recrystallization temperature T_(r)).The larger grain size and much less grain boundaries should account for the relatively lower strength and SCC resistance.A larger rolling reduction of 80% under the same FRT resulted in the formation of massive martensite-austenite(M/A)constituents and resultant low ductility and SCC resistance.In contrast,a good combination of strength,ductility and SCC resistance was obtained via 80% rolling reduction with the FRT of 860℃(within non-recrystallization temperature T_(nr)),probably because of the fine grain size and M/A constituents,as well as a high density of grain boundary network.展开更多
文摘For many years, the authors systematically summed up the previous studies, ex-plored the statistical characters of rock mass structure, and the mechanical characters,and developed the principle system of'Statistic Mechanics of Rock Mass'. This notewill briefly introduce the primary principles of the theory.
基金financially supported by the National Key Research and Development Program of China(No.2016YFB0300604)the National Nature Science Foundation of China(51801011)+1 种基金the National Materials Corrosion and Protection Data Center,the State Key Laboratory of Metal Material for Marine Equipment and Application(SKLMEA-K201908)the Fundamental Research Funds for the Central Universities(FRF-TP-18-026A1)。
文摘The effect of hot rolling process on microstructure evolution,mechanical properties and stress corrosion cracking(SCC)resistance of high-strength low-alloy(HSLA)steels was investigated by varying the finish rolling temperature(FRT)and total rolling reduction.The results revealed granular bainite with large equiaxed grains was obtained by a total rolling reduction of60%with the FRT of 950℃(within recrystallization temperature T_(r)).The larger grain size and much less grain boundaries should account for the relatively lower strength and SCC resistance.A larger rolling reduction of 80% under the same FRT resulted in the formation of massive martensite-austenite(M/A)constituents and resultant low ductility and SCC resistance.In contrast,a good combination of strength,ductility and SCC resistance was obtained via 80% rolling reduction with the FRT of 860℃(within non-recrystallization temperature T_(nr)),probably because of the fine grain size and M/A constituents,as well as a high density of grain boundary network.
