摘要
以单轴拉伸试验测定了奥氏体不锈钢３０４Ｌ和３０４ＬＮ的室温加工硬化曲线，并用数学模型。σ＝Ｋ１εｎ１＋ｅｘｐ（Ｋ２十ｎ２ε）、σ＝σ０＋Ｋεｎ和σ＝Ｋεｎ＋ｎｌｎε进行描述．比较三个数学模型的最大描述偏差表明，奥氏体不锈钢３０４Ｌ和３０４ＬＮ的加工硬化曲线可用σ＝Ｋεｎ＋ｎｌｎε描述．两种钢的形变结构中出现层错、晶界和退火孪晶处的位错塞积、位错胞状组织和形变孪晶．这些组织结构变化均产生加工硬化，其中位错塞积和形变孪晶的贡献大．
The work hardening curves were measured on the austenitic stainless steels 304L and 304LN by tensile testing at room temperature, and are described by the mathematical models σ=K1εn1+exp(K2+n2ε) σ=σ0+Kεn and σ=Kεn1+n2lnε. By compring the maximum deviations of description for the three models, both curves can be expressed as σ=Kεn1+n2lnε, and these maximum deviations are smaller than 2.35%. The stacking fault, the dislocation pile-up near grain and annealing twin boundaries, the dislocation cells and the deformation twins can be formed in both steels. All these changes in structure during deformation cause work hordening, while the dislocation pile-up and the deformation twins are the main contributions to the flow stress.
出处
《大连铁道学院学报》
2001年第4期59-64,共6页
Journal of Dalian Railway Institute
