本文選題：加工硬化率　切入點(diǎn)：鑄態(tài)QB鋼法蘭坯　出處：《金屬熱處理》2017年02期 　論文類型：期刊論文

【摘要】：在Gleeble-3500熱力模擬機(jī)上研究鑄態(tài)Q235B鋼法蘭坯材料的高溫壓縮行為,采用加工硬化率方法,識(shí)別出了動(dòng)態(tài)再結(jié)晶臨界條件,引入無量綱參數(shù)Zener-Hollomn表征了該材料動(dòng)態(tài)再結(jié)晶演變的臨界應(yīng)變、臨界應(yīng)力、峰值應(yīng)變以及穩(wěn)態(tài)應(yīng)變模型,并對(duì)其再結(jié)晶顯微組織演化進(jìn)行分析。在高溫、低應(yīng)變速率下,該鑄態(tài)材料的動(dòng)態(tài)再結(jié)晶容易發(fā)生,晶粒長大更迅速;隨著應(yīng)變速率增大,動(dòng)態(tài)再結(jié)晶難于啟動(dòng),晶粒直徑減小。在1050℃和1 s~(-1)下變形到達(dá)穩(wěn)態(tài)時(shí)的晶粒細(xì)化效果最為顯著。
[Abstract]:The high temperature compression behavior of as-cast Q235B steel flange billet was studied on Gleeble-3500 thermal simulator. The critical condition of dynamic recrystallization was identified by the method of work hardening rate. The dimensionless parameter Zener-Hollomn was introduced to characterize the critical strain, critical stress, peak strain and steady strain model of the dynamic recrystallization evolution of the material, and the evolution of recrystallization microstructure was analyzed at high temperature and low strain rate. The dynamic recrystallization of the as-cast material is easy to occur and the grain grows faster. With the increase of the strain rate, the dynamic recrystallization is difficult to start and the grain diameter decreases. The grain refinement effect is most remarkable when the deformation reaches steady state at 1050 鈩，

本文編號(hào)：1593658