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为考察应变强化、深冷温度对S30408奥氏体不锈钢组织性能的影响,对S30408钢进行室温预应变后,在深冷温度进行冲击试验,通过XRD、TEM、金相观察等分析S30408钢相组成及组织变化。结果表明,S30408室温冲击韧性随着应变量增大而逐渐降低;不同预应变量S30408钢冲击韧性随着温度降低而下降,并在77~4.2 K温度范围内出现“平台”。10%应变后的S30408钢显微组织为α’马氏体与γ奥氏体相间分布,继续深冷温度处理后显微组织变化不明显,相组成仍主要为γ与α’,马氏体总体含量并未显著增加。
In order to investigate the effect of strain hardening and cryogenic temperature on the microstructure and properties of S30408 austenitic stainless steel, S30408 steel was subjected to pre-strain at room temperature and then subjected to impact test at cryogenic temperature. The phase composition of S30408 steel was analyzed by XRD, TEM and metallographic observation And organizational change. The results show that the impact toughness of S30408 decreases with the increase of strain at room temperature. The impact toughness of S30408 steel decreases with the decrease of temperature, and appears “plateau” in the temperature range of 77 ~ 4.2 K. After 10% strain, the microstructure of S30408 steel was distributed between α ’martensite and γ austenite. The microstructure of the steel did not change obviously after cryogenic temperature treatment. The phase composition was still mainly γ and α’ The overall content did not significantly increase.