18-5-Nb钢中的γ相在室温下处于亚稳状态,室温塑性形变可诱发γ→α马氏体相变,马氏体相变量随形变量而增加。冷塑性形变使18-5-Nb钢抗氯化物SCC性能显著降低,这与钢中γ相的耐蚀性下降有关。在NaCl溶液中,18-5-Nb钢的SCC裂纹以点蚀坑为起源,γ相的选择性腐蚀在点蚀及SCC裂纹的形成和扩展过程中起着重要作用。
The SCC susceptibility of the plastically predeformed 18-5-Nb duplexstainless steel to localized corrosion was evaluated in Both 25% NaCl+1% K_2Cr_2O_7and 42% MgCl_2 Boiling solutions. The γ-phase in the steel is metastable at roomtemperature and the γ-α′martensitic transformation can be induced by cold plasticdeformation. With the increase in deformation, the volume fraction of α′marten-site increases while the pitting resistance of the alloy decreases. Cold plastic defor-mation results in a remarkable deterioration of SCC resistance of the steel inchloride solutions, resulting from the decrease in corrosion resistance of γ-phasein the duplex. It is indicated that, in NaCl solution, SCC in 18-5-Nb duplexstainless steel initiates at pits and the selective attack on the γ-phase plays asignificant role in the initiation and development of SCC.
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