【摘要】：根據(jù)熱鍛工藝溫度-時間特征,利用Gleeble-3800熱模擬試驗機(jī)對H13鋼進(jìn)行高溫壓縮試驗,在變形溫度為800~1 100℃,變形速率為0.1~10s-1條件下獲得真應(yīng)力-真應(yīng)變曲線。試驗結(jié)果表明:壓縮過程中,外力做功會導(dǎo)致樣品溫度升高,溫升幅度隨變形速率的增加而增大,在較低溫度下變形時溫升更為顯著,這部分溫升有利于促進(jìn)動態(tài)再結(jié)晶的軟化過程。由此導(dǎo)致900℃以下變形的試樣在更小應(yīng)變下就可發(fā)生再結(jié)晶,其峰值應(yīng)力不會隨變形速率升高而增大,甚至略微降低,呈現(xiàn)出較好塑性。相同變形溫度下,變形后的晶粒尺寸隨溫升幅度的增加而增大。
[Abstract]:According to the temperature-time characteristics of hot forging process, the high temperature compression test of H13 steel was carried out by using Gleeble-3800 thermal simulator. The true stress-true strain curve was obtained under the condition of 800 鈩，

本文編號：2339369