@article{oai:ir.kagoshima-u.ac.jp:00010614,
 author = {NAKANISHI, Kenji and 中西, 賢二},
 journal = {鹿児島大学工学部研究報告, The research reports of the Faculty of Engineering, Kagoshima University},
 month = {Nov},
 note = {In almost all metal forming processes, such as rolling, extrusion, swaging, and forging etc., both strain-rate and temperature vary during deformation. Experimental results reveal that many metallic materials show a remarkable strain rate dependence of flow stress at warm and hot deformation temperature. The work-hardening rate equation previously proposed by the present author, et al. is available to predict the flow curves under the conditions of varying strain-rate and varying temperature during deformation. The equation consists of the basic work-hardening rate term and the relative dynamic recovery rate term. Dynamic restoration process in high temperature deformation involves, in some cases, work-softening due to dynamic recrystallization, in addition to dynamic recovery. Then, the work-softening term is newly formulated and added to the previous equation, and some supplemental equations required for constructing the computer program of flow curve prediction are also developed by the numerical analysis regarding the experimental flow curves of annealed OFHC copper. Some flow curves are calculated by using the computer program of flow curve prediction with taking into account the effects of both varying strain-rate and varying temperature in upsetting experiments, under either isothermal or adiabatic conditions. Excellent agreement is found when the calculated flow curves are compared with those obtained experimentally.},
 pages = {13--32},
 title = {Development of the work-hardening rate equations for exact prediction of the flow curves at elevated temperatures : application of OFHC. Copper},
 volume = {30},
 year = {1988}
}