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首页> 外文会议>First International Conference on Computational Methods in Materials Characterisation; Santa Fe, New Mexico >The effect of martensite transformation induced by plastic deformation on the stainless steels formability limits
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The effect of martensite transformation induced by plastic deformation on the stainless steels formability limits

机译：塑性变形引起的马氏体相变对不锈钢成形性极限的影响

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摘要

Sheet metal forming processes are generally limited by plastic instability and tearing. The acceptable strain limits during such processing of sheet materials can be assessed by a forming limit diagram (FLD). In this research formability properties of stainless steels and the effect of martensite transformation during plastic deformation on this property are studied. The formability properties of austenitic and ferritic stainless steel are studied in both theoretical and experimental approaches, using the concept of forming limit diagram. In the theoretical approach a localized necking model and the Hill's quadratic anisotropy yield criterion are used and the material is considered to be strain hardened and sensitive to the strain rate. The experimental FLD are obtained using uniaxial tension test of notched strips and stretch forming test by hemispherical punch. The percent of martensite transformation induced by plastic deformation is measured using permeability factor and weighing method. The results show that the formability of austenitic stainless steels are better than ferritic ones. Also the formability of austentic stainless steels 304 because of martensite transformation that occurred during plastic deformation is better than 316 stainless steel.
机译：钣金成形过程通常受到塑料不稳定性和撕裂的限制。可以通过成形极限图（FLD）评估在这种板材加工过程中可接受的应变极限。在这项研究中，研究了不锈钢的可成形性以及塑性变形过程中马氏体相变对其的影响。使用成形极限图的概念，通过理论和实验方法研究了奥氏体和铁素体不锈钢的可成形性。在理论方法中，使用了局部颈缩模型和Hill的二次各向异性屈服准则，该材料被认为是应变硬化的，并且对应变率敏感。实验性FLD是使用带缺口的条带的单轴拉伸试验和半球形冲头的拉伸成形试验获得的。塑性变形引起的马氏体相变的百分比是使用磁导率因子和称量法测量的。结果表明，奥氏体不锈钢的可成形性优于铁素体不锈钢。由于在塑性变形期间发生的马氏体相变，奥氏体不锈钢304的可成形性也比316不锈钢好。

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