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对固溶态的2906超级双相不锈钢材料进行了650～950℃×6 h时效处理,利用OM、XRD、SEM、EDS和电化学工作站分析了时效温度对材料金属间相、力学性能和耐蚀性能的影响。试验结果表明:650℃时效6 h时,没有发现σ相生成,材料的抗拉强度和耐蚀性变化不大;当时效温度为750℃,组织中生成σ相含量最多,导致抗拉强度降低、塑性及耐蚀性大大下降,但硬度略有提高;随着时效温度的进一步提高到850℃及950℃,生成的σ相逐渐减少,强度及耐蚀性略有回升。
The aging treatment of solid state 2906 super duplex stainless steel was carried out at 650-950 ℃ for 6 h. The effects of aging temperature on the intermetallic phases, mechanical properties and corrosion resistance of the material were analyzed by OM, XRD, SEM, EDS and electrochemical workstation. The impact of performance. The results show that the σ phase is not formed when aging at 650 ℃ for 6 h, and the tensile strength and corrosion resistance of the material do not change much. When the aging temperature is 750 ℃, the content of σ phase is the most, resulting in the decrease of tensile strength The plasticity and corrosion resistance greatly decreased, but the hardness increased slightly. With the further increase of the aging temperature to 850 ℃ and 950 ℃, the σ phase decreased and the strength and corrosion resistance slightly increased.