09CrCuSb钢连铸坯的高温力学性能

High Temperature Mechanical Property of 09CrCuSb Steel Slab

采用Gleeble-3500热模拟试验机对09CrCuSb钢连铸坯的高温力学性能进行测试,得到其在650~1 300℃的应力—应变曲线、高温强度、热塑性和塑性模量的变化规律。结果表明:应力—应变曲线中,应力峰值随测试温度升高而减小,当测试温度高于700℃时,应力—应变曲线中出现应力平台现象;连铸坯试样的高温强度较差,随温度升高,其高温强度整体呈下降趋势;在2.4×10-3 s-1应变速率下,存在两个明显的脆性温度区间,第一脆性温度区间为1 200℃~熔点,第三脆性温度区间为700~800℃,在825~1 250℃时09CrCuSb钢连铸坯热塑性较好,断面收缩率均大于80%;连铸坯试样的高温塑性模量在675~1 300℃时小于660.099 MPa。

The high temperature mechanical properties of 09 CrCuSb steel billet were tested by the hot tensile test technique with Gleeble-3500 system.The stress-strain curve,high temperature strength,thermo-plasticity and plastic modulus with temperature in the range of 650~1 300 ℃were obtained.The results show that in the stress-strain curve,the peak stress decreases with the increase of the test temperature.When the test temperature is higher than 700 ℃,a stress platform appears in the stress-strain curve.The high temperature strength of continuous casting slab sample is poor,and with the increase of temperature,its high temperature strength tends to decrease.At the strain rate of 2.4×10-3/s,there are two brittle temperature ranges.The range of brittleness temperature Ⅰ is 1 200 ℃~melting point,and he range of brittleness temperature Ⅲ is 700~800 ℃.In the range of 825~1 250 ℃, 09 CrCuSb steel billet shows good thermoplasticity,and its section shrinkage rate is more than 80%.The high temperature plastic modulus of 09 CrCuSb steel slab is less than 660.099 MPa when temperature is in range of 675~1 300 ℃.