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通过对不同厚度、不同抗拉强度的奥氏体不锈钢304箔材进行多种标距的拉伸试验,利用伸长率与比例系数进行回归拟合的方式,分析了影响304箔材n值的主要因素,总结了Olive公式在固溶态和冷变形304箔材中的应用规律,拓宽了Olive伸长率换算公式的应用范围。结果表明:试样适宜的L0取值范围为20~90 mm,试样厚度(宽厚比)与n值间无明显的相关性。另外对于Rm≥750 MPa的冷变形304箔材,n值与抗拉强度间呈正相关。同时分3个抗拉强度范围给出了n值的预测值,当Rm≤750 MPa时,n=0.130,与标准规定值完全吻合;760 MPa≤Rm≤960 MPa时,n=0.160;1 050 MPa≤Rm≤1 270 MPa时,n=0.378。
Through the tensile test of gauge gauge austenitic stainless steel 304 foil with different thickness and different tensile strength, the relationship between the n value of 304 foil The main factors that summarize the application of Olive formula in solid solution and cold deformation of 304 foil and broaden the application range of Olive elongation conversion formula. The results show that the suitable range of L0 is 20 ~ 90 mm, and there is no obvious correlation between the thickness of specimen and the value of n. In addition, for the cold-deformed 304 foil with Rm≥750 MPa, there is a positive correlation between the n value and the tensile strength. At the same time, the predictive value of n value is given in three tensile strength ranges. When Rm≤750 MPa, n = 0.130, which is completely consistent with the standard value. When 760 MPa≤Rm≤960 MPa, n = 0.160; 1 050 When MPa≤Rm≤1 270 MPa, n = 0.378.