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Metal-forming problems with combined hardening
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作者 T.A.ANGELOV 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2012年第2期233-242,共10页
A class of quasisteady metalforming problems under nonlocal contact and Coulomb's friction boundary conditions is considered with an incompressible, rigid plastic, strainrate dependent, isotropic, and kinematic harde... A class of quasisteady metalforming problems under nonlocal contact and Coulomb's friction boundary conditions is considered with an incompressible, rigid plastic, strainrate dependent, isotropic, and kinematic hardening material model. A coupled variational formulation is derived, the convergence of a variable stiffness parame ter method with time retardation is proved, and the existence and uniqueness results are obtained. 展开更多
关键词 RIGID-PLASTIC combined hardening nonlocal friction variational analysis quasi-steady
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Investigation on microstructure and properties of a combined precipitation hardening ultrahigh strength steel
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作者 WANG Chunxu~(1)),LI Yong~(1)),LIU Xianmin~(1)) and TIAN Zhiling~(2)) 1) Institute for Structural materials,Central Iron and Steel Research Institute, Beijing 100081,China 2) China Iron and Steel Research Institute Group,Beijing 100081,China 《Baosteel Technical Research》 CAS 2010年第S1期67-,共1页
The microstructure and properties of a combined precipitation hardening ultrahigh strength steel with nano-sized carbides and intermetallics were studied systematically.The results show that after tempering at 300℃lo... The microstructure and properties of a combined precipitation hardening ultrahigh strength steel with nano-sized carbides and intermetallics were studied systematically.The results show that after tempering at 300℃lots ofε-carbides are precipitated in the martensite,the strength rises and the toughness falls slightly.After tempering at 430℃,much coarser cementite lamina are precipitated in martensitic laths,which causes the impact toughness falls to the minimum value.With temperature further increasing the cementites are dissolved and M_2C carbides,β-NiAl intermetallics and reverse austenite begin to precipitate.The tensile strength and yield strength achieve the peak value at 470℃,490℃respectively.The tested steel achieve a tensile strength of 2 120 MPa,a yield strength of 1 950 MPa and impact energy of 54 J/cm^2 after optimum tempering at 510℃.When tempering temperature is above 530℃the M_2C carbides and reverse austenite is coarsening.After tempering at 560℃the reverse austenite reaches the maximum volume fraction in present work. 展开更多
关键词 ultra-high strength steel combined precipitation hardening INTERMETALLICS carbides
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