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Hot Deformation Characteristics of 34Crmo4 Steel

Journal of Iron and Steel research International 2010年第12期17卷 65-69页

作者： S V Sajadi Far m Ketabchi m r nourani mining and metallurgical Engineering Department Amirkabir University of Technology

The 34Crmo4 （AISI 4130） steel is extensively utilized in the compressed natural gas cylinders. Due to the importance of thermomechanical processing in the production of these cylinders, the dynamic reerystallization （DrX） characteristics of 34Crmo4 steel were investigated. The effect of hot deformation parameters such as temperature and strain rate on the dynamic restoration processes of a 34Crmo4 alloy was studied. Hot compression tests were performed in the temperature range of 900 to 1 100 ℃ and the strain rate range of 0. 001 to 0.1 s-1. Hot workability of this alloy has been analyzed by employing flow localization parameter. The flow curves observed are typical of occurrence of dynamic recrystallization and have exhibited single or multiple peaks in flow stress curve before reaching steady state, depending on the temperature and strain rates. The flow stress decreases with the increase of deformation temperature and the decrease of strain rate. Finally the activation energy obtained in this research is 490. 749 kJ/mol.

关键词： 34Crmo4 steel hot deformation activation energy dynamic recrystalization

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Classification and assessment of rock mass parameters in Choghart iron mine using P-wave velocity

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Journal of rock mechanics and Geotechnical Engineering 2017年第2期9卷 318-328页

作者： mohammadreza Hemmati nourani mohsen Taheri moghadder mohsen Safari Department of mining and metallurgy Yazd UniversityYazdIran Department of mining Engineering Shahid Bahonar University of KermanKermanIran Department of mining Engineering Birjand University of TechnologyBirjandIran

Engineering rock mass classification,based on empirical relations between rock mass parameters and engineering applications,is commonly used in rock engineering and forms the basis for designing rock *** basic data required may be obtained from visual observation and laboratory or field ***,owing to the discontinuous and variable nature of rock masses,it is difficult for rock engineers to directly obtain the specific design parameters *** an alternative,the use of geophysical methods in geomechanics such as seismography may largely address this *** this study,25 seismic profiles with the total length of 543 m have been scanned to determine the geomechanical properties of the rock mass in blocks Ⅰ,Ⅲ and Ⅳ-2 of the Choghart iron ***,rock joint measurements and sampling for laboratory tests were *** results show that the rock mass rating（rmr） and Q values have a close relation with P-wave velocity parameters,including P-wave velocity in field(V;).P-wave velocity in the laboratory(V;) and the ratio of V;V;(i.e.K;= V;/V;.However,Q value,totally,has greater correlation coefficient and less error than the rmr,In addition,rock mass parameters including rock quality designation（rQD）,uniaxial compressive strength（UCS）,joint roughness coefficient（JrC） and Schmidt number（rN） show close relationship with P-wave *** equation based on these parameters was obtained to estimate the P-wave velocity in the rock mass with a correlation coefficient of 91%.The velocities in two orthogonal directions and the results of joint study show that the wave velocity anisotropy in rock mass may be used as an efficient tool to assess the strong and weak directions in rock mass.

关键词： rock mass classification P-wave velocity Q system rock mass rating(rmr) Geophysical methods

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