论文部分内容阅读
对国产和进口S30432钢的微观组织以及夹杂物的形态进行对比,研究了高温条件下S30432钢的力学性能及高温拉伸后该材料显微结构。结果表明:国产S30432钢管的杂质元素和非金属夹杂物含量、晶粒度控制良好;S30432钢的高温抗拉强度随温度的升高而降低,但其屈服强度在600～700℃出现波动,700℃时屈服强度略高于600℃。通过对拉断后试样的显微组织分析可知,在700℃时析出了更多弥散分布的强化相,其阻碍了位错的运动。
The microstructure and the morphology of inclusions in domestic and imported S30432 steel were compared. The mechanical properties of S30432 steel under high temperature and the microstructure of the material were studied. The results show that the content of impurity elements and non-metallic inclusions in domestic S30432 steel pipe and the grain size are controlled well. The high temperature tensile strength of S30432 steel decreases with the increase of temperature, but its yield strength fluctuates at 600-700 ℃. ℃ when the yield strength slightly higher than 600 ℃. By analyzing the microstructure of the sample after tension-breaking, it can be seen that more dispersed phases are precipitated at 700 ℃, which hinders the movement of dislocations.