Characterization of Hot Deformation Behavior and Processing Map of As-Cast H13 Hot Work Die Steel
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Characterization of Hot Deformation Behavior and Processing Map of As‑Cast H13 Hot Work Die Steel Yahui Han1 · Changsheng Li1 · Jinyi Ren1 · Chunlin Qiu1 · En LI1 · Shuaishuai Chen1 Received: 17 June 2020 / Accepted: 18 August 2020 © The Korean Institute of Metals and Materials 2020
Abstract The hot-working behavior of as-cast H13 hot work die steel was investigated in the method of isothermal compression test involving the wide deformation temperatures of 900–1150 °C and strain rates of 0.01–10 s−1, with the true strain to 0.8, on the MMS-200 thermo-mechanical simulator. Two characteristic parameters involving the critical strain for DRX initiation ( 𝜀c ) and the strain for peak stress ( 𝜀p ) were identified. The ratio of critical strain to peak strain ranged from 0.26 to 0.6, which decreased with the increase in temperature and decrease in strain rate. Processing maps were established using dynamic material model at strains of 0.2, 0.4, 0.6, 0.8. The power dissipation maps were not significantly affected by the strain, while the instability maps were sensitivity with the strain when it was over 0.4. The area of instability domain at strain of 0.8 was the largest. The instable characteristics contained the mixed grain structure, adiabatic shear band, intense deformation in serious deformation area and brittle elemental segregation area. The chief effect on the power dissipation was the strain rate, the optimum hot working parameters at strain of 0.8 (910–985 °C, 1010–1150 °C and 0.01–0.05 s−1) were determined. In this filed, the original coarse as-cast grains were gradually refined by dynamic recrystallization mechanism and the DRX grain numbers had a significant increase with the increase of power dissipation efficiency. Keywords As-cast H13 steel · Hot deformation behavior · Processing map · Instable characteristics · Optimum hot-working window
1 Introduction In industrial applications, the chromium-molybdenum-vanadium type AISI H13 steel is now widely used all over the world for its high strength, high hardness and high thermal stability [1, 2]. These properties are mainly attributed to the * Changsheng Li [email protected] Yahui Han [email protected] Jinyi Ren [email protected] Chunlin Qiu [email protected] En LI [email protected] Shuaishuai Chen [email protected] 1
State Key Lab of Rolling and Automation, Northeastern University, Shenyang 118019, People’s Republic of China
feature of chemical composition, i.e. carbon element content of about 0.40 wt% and high alloying elements content of 8%, such as the chromium, molybdenum and vanadium. This chemical composition will inevitably bring up the dendrites during un-equilibrium solidification process [3]. Moreover, the addition of alloying element will increase the stacking fault energy (SFE), leading to the sluggish of recrystallization because of the accelerated recovery processes [4, 5]. Thus, its deformation behavior may own special features. It is well known that H13 steel has a high chromiummolybdenum-vanadium content, in which the content o
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