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首页> 外文期刊>ISIJ international >High-temperature Embrittlement in Si-added Austenitic Stainless Steel
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High-temperature Embrittlement in Si-added Austenitic Stainless Steel

机译：Si加入奥氏体不锈钢中的高温脆化

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High-temperature tensile tests, a cast-slab microstructure investigation, and an in-situ observation of the dissolution behavior of 17%Cr-14%Ni-4%Si-Nb steel during heat treatment were conducted. The ductility suddenly decreased at above 1 200°C. A microstructure observation near the cast-slab surface suggests that the solidification mode was a divorced eutectic ferrite-austenite; in addition, the precipitation of Fe_(16)N-b_6Si_7 (G phase) occurred inside the δ phase and at the δ/γ interface. The temperature at which solidification was completed, as calculated using DICTRA, was 1 331°C; hence, the embrittlement at about 1 200°C, observed during the high-temperature tensile tests, was different from the I-zone embrittlement caused by the residual liquid phase during solidification. The in-situ observations showed that liquefaction occurred from the δ phase near the δ/γ interface at above 1 180°C. The high-temperature embrittlement was attributed to compositional liquefaction, in which the G phase was precipitated inside the δ phase and at the δ/γ interface during the cooling process after solidification provided Si and Ni owing to the dissolution upon re-heating.
机译：进行高温拉伸试验，铸造板微观结构研究，并进行了热处理期间17％Cr-14％Ni-4％Si-Nb钢的溶出行为的原位观察。延展性在高于1 200°C以上突然下降。铸造板表面附近的微观结构观察表明凝固模式是离立的共晶铁素体 - 奥氏体;另外，在Δ相位和Δ/γ接口处发生Fe_（16）N-B_6SI_7（G阶段）的沉淀。使用DiCtra计算的凝固的温度为1 331°C;因此，在高温拉伸试验期间观察到约1200℃的脆化与凝固过程中残余液相引起的I区脆化不同。原位观察表明，在180℃的Δ/γ界面附近的δ相位发生液化。高温脆化归因于组成液化，其中G相在δ相的内部沉淀，并在冷却过程中在凝固过程中在再加热时提供Si和Ni的δ/γ界面。

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