基于高温蠕变变形的Q345c板坯连续弯曲矫直技术

IF 3.1 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Journal of Iron and Steel Research(International) Pub Date : 2017-06-01 DOI:10.1016/S1006-706X(17)30090-0
Long Guo, Xing-zhong Zhang, Chang-xi Feng
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引用次数: 2

摘要

以充分利用高温蠕变变形为目的,提出了一种新的连续弯曲矫直铸造曲线。弯曲和矫直段的曲率随弧长呈正弦规律变化。基本弧段明显缩短,从而延长了弯曲矫直区域的长度,增加了蠕变行为的时间。在1200℃时,用有限元法计算了板坯到凝固前沿的距离。新铸曲线在板坯内不同位置的最大应变率在弯曲段为6.39 × 10−5 s−1,在矫直段趋于3.70 × 10−5 s−1。在1200℃下,当应力为14 MPa时,蠕变应变速率最小为7.45 × 10−5 s−1。新型铸造机的应变速率可以小于最小蠕变应变速率。因此,钢连铸弯矫直过程中只有蠕变,没有塑性变形。板的变形取决于蠕变行为。对高温蠕变性能的研究有助于新铸锭机的设计和旧铸锭机的改进。
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Continuous bending and straightening technology of Q345c slab based on high-temperature creep deformation

A new continuous bending and straightening casting curve with the aim of full using of high-temperature creep deformation was proposed. The curvature of bending and straightening segment varies as sine law with arc length. The basic arc segment is shortened significantly so that the length of bending and straightening area can be extended and the time of creep behavior can be increased. The distance from solidifying front in the slab was calculated at 1200 °C by finite element method. The maximum strain rate of new casting curve at different locations inside the slab is 6.39 × 10−5 s−1 during the bending segment and it tends to be 3.70 × 10−5 s−1 in the straightening segment. The minimum creep strain rate is 7.45 × 10−5 s−1 when the stress is 14 MPa at 1200 °C. The strain rate of new casting machine can be less than the minimum creep strain rate. Thus, there is only creep deformation and no plastic deformation in the bending and straightening process of steel continuous casting. Deformation of slabs depending on creep behavior only comes true. It is helpful for the design of the new casting machine and improvement of old casting machine depending on high temperature creep property.

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来源期刊
CiteScore
4.30
自引率
0.00%
发文量
2879
审稿时长
3.0 months
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