论文部分内容阅读
采用Gleeble-1500D热/力模拟试验机对Q235B连铸坯高温力学性能进行了测试。测试了试验温度为950℃,应变速率分别为1×10-3、5×10-3、1×10-2、5×10-2s-1时Q235B钢连铸坯的高温力学性能,以及应变速率为5×10-3s-1的条件下,测试温度在700~1000℃时Q235B钢连铸坯的高温力学性能。结果表明:Q235B钢连铸坯的高温抗拉强度和屈服强度随应变速率的升高而增大,而断面收缩率随着应变速率的升高则降低;应变速率对Q235B钢连铸坯高温强度的影响分为敏感区和不敏感区,温度为950℃时,临界应变速率ε觶c为1×10-2s-1;随温度升高,Q235B钢连铸坯的高温抗拉强度和屈服强度均降低,Q235B钢连铸坯的断面收缩率Z随温度的升高总呈上升趋势;在850~950℃内出现了脆化区,在900℃左右时,Z值为58%;温度对硬化指数n的影响较为复杂,硬化指数n随应变速率的增大而降低。
The high temperature mechanical properties of Q235B continuous casting billet were tested by Gleeble-1500D heat / force simulator. The mechanical properties of Q235B steel slab at 950 ℃ and strain rates of 1 × 10-3, 5 × 10-3, 1 × 10-2 and 5 × 10-2s-1 were tested. The rate of 5 × 10-3s-1 under the conditions of the test temperature of 700 ~ 1000 ℃ Q235B steel billets at high temperature mechanical properties. The results show that the high temperature tensile strength and yield strength of Q235B steel billet increase with the increase of strain rate, while the reduction of area decreases with the increase of strain rate. The strain rate affects the high temperature strength , The critical strain rate ε 觯 c is 1 × 10-2s-1 at 950 ℃. With the increase of temperature, the high temperature tensile strength and yield strength of Q235B steel slab The reduction of area Z of Q235B steel billet tends to increase along with the increase of temperature; the embrittlement zone appears in 850-950 ℃, and the Z value is 58% at about 900 ℃; The influence of the index n is more complicated, and the hardening index n decreases with the increase of strain rate.