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首页> 外文会议>International Conference on TRIP-Aided High Strength Ferrous Alloys, Jun 19-21, 2002, Ghent, Belgium >Development and characterization of high strength impact resistant Fe-Mn-(Al-, Si) TRIP/TWIP steels
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Development and characterization of high strength impact resistant Fe-Mn-(Al-, Si) TRIP/TWIP steels

机译：高强度抗冲击Fe-Mn-（Al-，Si）TRIP / TWIP钢的研制与表征

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摘要

Iron manganese steels with Mn mass contents of 15 to 30% exhibit microstructural related superior ductility and extraordinary strengthening behaviour during plastic deformation, which strongly depends on the Mn content. This influences the austenite stability and stacking fault energy γ_(fcc) and shows a great impact on the microstructure to be developed under certain stress state or during severe plastic deformation. At medium Mn mass contents (15 to 20%) the martensitic γ-ε-α' phase transformation plays an important role in the deformation mechanisms of the TRIP effect in addition to dislocation glide. With increasing Mn mass content large elongation is favoured by intensive twinning formation. The mechanical properties of plain iron manganese alloys are strongly influenced by the alloying elements, Al and Si. Alloying with Al increases the stacking fault energy and therefore strongly suppresses the martensitic γ-ε transformation, while Si sustains the γ-ε transformation by decreasing the stacking fault energy γ_(fcc). The γ-ε phase transformation takes place in Fe-Mn-X alloys with γ_(fcc) ≤ 20 mJm~(-2). The developed light weight high manganese TRIP and TWIP (twinning induced plasticity) steels exhibit high ultimate tensile strength (600 to 1100 MPa) and extremely large elongation of 60 to 95 % even at high strain rates of ε = 10~3 s~(-1). Particularly due to the advanced specific energy absorption of TRIP and TWIP steels compared to conventional deep drawing steels high dynamic tensile and compression tests were carried out in order to investigate the change in the microstructure under near crash conditions. Tensile and compression tests of iron manganese alloys with varying Mn content were performed at different temperatures and strain rates. The resulting formation of γ twins, α'- and ε martensite by plastic deformation was analysed by optical microscopy and X-ray diffraction. The deep drawing and stretch forming behaviour at varying deformation rates were determined by performing cupping tests and digitalised stress-strain-analysis.
机译：Mn质量含量为15％至30％的铁锰钢在塑性变形过程中表现出与显微组织相关的优良延展性和非凡的强化行为，这在很大程度上取决于Mn含量。这影响了奥氏体的稳定性和堆垛层错能γ_（fcc），并且在一定的应力状态下或在严重的塑性变形过程中，对要形成的显微​​组织有很大影响。在锰含量中等（15％至20％）时，马氏体γ-ε-α'相变除了位错滑移外，在TRIP效应的变形机理中也起着重要作用。随着Mn质量含量的增加，强烈的孪晶形成有利于大的伸长率。普通铁锰合金的机械性能受合金元素Al和Si的强烈影响。与Al合金化会增加堆垛层错能，因此会强烈抑制马氏体γ-ε相变，而Si通过降低堆垛层错能γ_（fcc）来维持γ-ε相变。在γ_（fcc）≤20 mJm〜（-2）的Fe-Mn-X合金中发生γ-ε相变。即使在ε= 10〜3 s〜（- 1）。特别是由于与传统的深冲钢相比，TRIP和TWIP钢具有更高的比能量吸收能力，因此进行了高动态拉伸和压缩试验，以研究在接近碰撞条件下的显微组织变化。在不同温度和应变速率下，对不同锰含量的铁锰合金进行了拉伸和压缩试验。通过光学显微镜和X射线衍射分析了由塑性变形形成的γ孪晶，α′-和ε马氏体的形成。通过执行拔罐测试和数字化应力应变分析来确定在不同变形速率下的深冲和拉伸成形行为。

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