论文部分内容阅读
采用铝热熔化法制备了纳米晶/微米晶复相316L不锈钢,研究了铸态和600~1 000℃退火态下钢的组织和力学性能特征。结果表明:随退火温度升高,纳米晶和微米晶的平均晶粒尺寸逐渐增大,微米晶的体积分数逐渐提高。1 000℃退火后组织中出现了FeNiCrAl金属间化合物相。600℃退火后抗拉强度最大,约574 MPa,伸长率为6.5%。800℃退火后,拉伸屈服强度和抗拉强度分别降至240 MPa和515 MPa,伸长率升高至18.2%。1 000℃退火后拉伸屈服强度和抗拉强度进一步降低,但塑性提高,伸长率达到41.2%。
The nanocrystalline / microcrystalline composite phase 316L stainless steel was prepared by hot melt method. The microstructures and mechanical properties of the as-cast and 600-1000 ℃ annealed steel were investigated. The results show that with the increase of annealing temperature, the average grain size of nanocrystalline and microcrystal increases and the volume fraction of microcrystal increases gradually. FeNiCrAl intermetallic phase appeared in the microstructure after annealing at 1000 ℃. The maximum tensile strength after annealing at 600 ℃ is about 574 MPa and the elongation is 6.5%. After annealing at 800 ℃, the tensile yield strength and tensile strength decreased to 240 MPa and 515 MPa, respectively, and the elongation increased to 18.2%. After annealing at 1000 ℃, the tensile yield strength and tensile strength decreased further, but the plasticity increased and the elongation reached 41.2%.