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首页> 外文期刊>Journal of Materials Engineering and Performance >Material Parameters for Creep Rupture of Austenitic Stainless Steel Foils
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Material Parameters for Creep Rupture of Austenitic Stainless Steel Foils

机译：奥氏体不锈钢薄板蠕变破裂的材料参数

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摘要

Creep rupture properties of austenitic stainless steel foil, 347SS, used in compact recuperators have been evaluated at 700℃ in the stress range of 54-221 MPa to establish the baseline behavior for its extended use. Creep curves of the foil show that the primary creep stage is brief and creep life is dominated by tertiary creep deformation with rupture lives in the range of 10-2000 h. Results are compared with properties of bulk specimens tested at 98 and 162 MPa. Thin foil 347SS specimens were found to have higher creep rates and higher rupture ductility than their bulk specimen counterparts. Power law relationship was obtained between the minimum creep rate and the applied stress with stress exponent value, n = 5.7. The value of the stress exponent is indicative of the rate-controlling deformation mechanism associated with dislocation creep. Nucleation of voids mainly occurred at second-phase particles (chromium-rich M_(23)C_6 carbides) that are present in the metal matrix by decohesion of the particle-matrix interface. The improvement in strength is attributed to the precipitation of fine niobium carbides in the matrix that act as obstacles to the movement of dislocations.
机译：紧凑型换热器中使用的奥氏体不锈钢箔347SS的蠕变断裂性能已在700℃，54-221 MPa应力范围内进行了评估，以确立其扩展使用的基线性能。箔片的蠕变曲线表明，初级蠕变阶段很短，蠕变寿命主要由三次蠕变变形控制，断裂寿命在10-2000 h范围内。将结果与在98和162 MPa下测试的大块试样的性能进行比较。发现薄箔347SS标本比其散装标本具有更高的蠕变速率和更高的断裂延展性。在最小蠕变率和施加应力之间以幂指数关系得到幂幂关系，应力指数值为n = 5.7。应力指数的值指示与位错蠕变相关的速率控制变形机制。空隙的成核主要发生在第二相粒子（富铬的M_（23）C_6碳化物）处，该第二相粒子通过粒子与基体界面的脱粘作用而存在于金属基体中。强度的提高归因于细小的碳化铌在基体中的沉淀，这是位错运动的障碍。

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