The effect of short-time aging in the temperature range between 400 and 1000 °C on the pitting corrosion behavior and mechanical property of a novel lean duplex stainless steel (LDSS) 2002 was investigated through the potentiostatic critical pitting temperature (CPT) tests and the Charpy impact tests. Both the pitting corrosion resistance and the toughness of aged specimens degraded due to the precipitation of detrimental secondary phases and the most significant reduction of CPT and impact energy emerged at 650 °C concurrently. The CPT of LDSS 2002 specimen aged at 650 °C decreased by 28 °C, and the impact energy dropped from 69 to 29 J/cm² compared with the solution-annealed sample. Transmission electron microscopy characterization showed that the main precipitates in LDSS 2002 were Cr₂N and M₂₃C₆ along the ferrite–austenite grain boundaries.

中文翻译：

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短时效对新型贫双相不锈钢2002点蚀行为的影响

通过恒电位临界点蚀温度（CPT）测试和电火花试验研究了在400至1000°C的温度范围内短时效对新型贫双相不锈钢（LDSS）2002的点蚀行为和力学性能的影响。夏比冲击试验。由于有害的第二相的析出，老化试样的抗点蚀性和韧性都降低了，同时CPT和冲击能的最大降低同时在650°C出现。与固溶退火样品相比，在650°C时效的LDSS 2002标本的CPT降低了28°C，冲击能量从69 J / cm ²下降至29 J / cm ²。透射电子显微镜表征表明，LDSS 2002中的主要沉淀为Cr ₂沿铁素体-奥氏体晶界的N和M ₂₃ C ₆。