The formation of deformation induced ferrite during mechanical testing
The formation of deformation induced ferrite during mechanical testing
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DOI：
10.2355/isijinternational.38.300
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发表时间：
1998-03
影响因子：
1.8
通讯作者：
J. E. Lewis;J. Jonas;B. Mintz
中科院分区：
文献类型：
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作者：
J. E. Lewis;J. Jonas;B. Mintz
研究了0.1%C、1.4%Mn钢中奥氏体晶粒尺寸、过冷度、压缩应变和应变速率对奥氏体-铁素体相变的影响。这种转变对热塑性的影响，然后检查。应变使有效Ar 3温度几乎提高到Ae 3，并显著加速了细晶（~ 25 μm）和粗晶（~ 200 μm）样品的相变。在相对较低的过冷度（~ 40°C）下，变形诱导铁素体仅在受施加应变显著影响的区域中形成。在拉伸中，观察到，如果显微组织中存在晶界铁素体的薄带，则延展性显著降低，并且总是在该第二相中发生失效。增加应变速率显着降低了整个宽度的延性槽的深度。得出的结论是，对于所讨论的钢，应在超过3 × 10 - 2s-1的应变速率下进行连铸后的矫直，以确保良好的延展性。
The effects of austenite grain size, level of undercooling, and strain and strain rate in compression on the austenite-to-ferrite transformation were investigated in a 0.1 % C, 1.4% Mn steel. The influence of this transformation on the hot ductility was then examined. Straining was found to raise the effective Ar 3 temperature almost to the Ae 3 , and to accelerate the transformation significantly in both fine (∼ 25 μm) and coarse (∼ 200 μm) grained samples. At relatively low levels of undercooling ( ∼40°C), deformation induced ferrite only formed in regions that were significantly affected by the applied strain. In tension, it was observed that, if thin bands of grain boundary ferrite were present in the microstructure, the ductility decreased significantly and failure always occurred in this second phase. Increasing the strain rate significantly reduced the depth of the ductility trough across its entire width. It is concluded that, for the steel in question, unbending after continuous casting should be performed at strain rates in excess of 3 x 10 -2 s -1 to ensure good ductility.