Development and Characterization of Novel Corrosion‐Resistant TWIP Steels
Development and Characterization of Novel Corrosion‐Resistant TWIP Steels
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新型耐腐蚀 TWIP 钢的开发和表征
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
W. Theisen
中科院分区：
文献类型：
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作者：
L. Mujica;S. Weber;G. Hunold;W. Theisen
具有孪晶诱导塑性（TSTs）的奥氏体钢是具有优异机械性能的材料。在这项工作中，发展的新等级的铁素体钢表现出耐腐蚀性。合金的发展得到了（Fe <$Mn <$Cr）-（C <$N）合金体系中热力学和扩散计算的支持。对于计算，环境压力和初级奥氏体凝固被认为是必要的，以避免在所有处理步骤中的氮气脱气。锰用作奥氏体稳定剂，铬用于增加氮的溶解度并提供耐腐蚀性，而碳和氮提供机械强度。扩散计算，以预测微观偏析的程度，并另外评估扩散退火处理的效果。该材料以实验室规模铸造，标称成分为Fe-20 Mn-12 Cr-0.25 C-0.3 N。扩散退火后进行热轧和固溶退火，得到完全奥氏体的显微组织。在室温下进行拉伸试验，表现出430 MPa的屈服强度和93%的断裂伸长率。此外，不仅是机械性能，而且焊接性进行了研究，重点是表征的激光和TIG焊获得的板上珠焊缝的显微组织。
Austenitic steels exhibiting twinning induced plasticity (TWIP) are materials with exceptional mechanical properties. In this work, the development of new grades of TWIP steels exhibiting corrosion resistance is presented. The alloy development was supported by thermodynamic and diffusion calculations within the (FeMnCr)‐(CN) alloy system. For the calculations ambient pressure and primary austenitic solidification were considered as necessary to avoid nitrogen degassing in all processing steps. Manganese is used as an austenite stabilizer, chromium to increase nitrogen solubility and provide corrosion resistance, while carbon and nitrogen provide mechanical strength. Diffusion calculations were used in order to predict the extent of micro segregations and additionally to evaluate the effect of diffusion annealing treatments. The material was cast in a laboratory scale with a nominal composition of Fe‐20Mn‐12Cr‐0.25C‐0.3N. Diffusion annealing was followed by hot rolling and solution annealing resulting in a fully austenitic microstructure. Tensile tests at room temperature were performed, exhibiting yield strengths of 430 MPa and elongation to fracture of 93%. In addition, not only the mechanical properties but also the weldability was studied, focussing on the characterization of the microstructure of bead on plate welds obtained by laser and TIG welding.