在管道成形过程中，通过竞争鲍辛格效应和应变硬化来预测扁平钢管的屈服强度。,Scientific Reports

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在管道成形过程中，通过竞争鲍辛格效应和应变硬化来预测扁平钢管的屈服强度。
Scientific Reports ( IF 3.8 ) Pub Date : 2019-09-30 , DOI: 10.1038/s41598-019-50328-4
Dae Woong Kim ₁ , Wan-Keun Kim ₂ , Jin-Ho Bae ₂ , Won-Doo Choi ₃ , Hyoung Seop Kim ₁ , Sunghak Lee ₁

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由于平整钢板通常比平整钢板具有出乎意料的更低或更高的屈服强度，因此人们一直在不断努力以准确预测管道成型行业的屈服强度。在目前的研究中，管线钢管或套管钢管的屈服强度是通过竞争博士伦效应预测的，并且在管材成型过程中发生了应变硬化。通过对管道内外壁的循环模拟分析，新定义了屈服降（YD）和屈服升（YR）参数，以更合理地表达鲍辛格效应和应变硬化。YD突然增加直到预应变约为1％，然后达到饱和，而YR随预应变的增加而线性增加。通过结合YD和YR，屈服强度（Δσ）的变化表现出上下波动，因为在低和高预应变下鲍辛格效应和应变硬化分别占主导地位，并合理地解释了Δσ与管道成型中使用的管道应变之间的关系。行业。根据与上下Δσ行为有关的显微组织分析，多边形铁素体在低预应变范围内降低了屈服强度降低，而粒状贝氏体或珠光体对其进行了膨胀。这种屈服强度预测与微结构分析相结合，为设计和可靠地预测各种钢管的屈服强度提供了一个好主意。根据与上下Δσ行为有关的显微组织分析，多边形铁素体在低预应变范围内降低了屈服强度降低，而粒状贝氏体或珠光体对其进行了膨胀。这种屈服强度预测与微结构分析相结合，为设计和可靠地预测各种钢管的屈服强度提供了一个好主意。根据与上下Δσ行为有关的显微组织分析，多边形铁素体在低预应变范围内降低了屈服强度降低，而粒状贝氏体或珠光体对其进行了膨胀。这种屈服强度预测与微结构分析相结合，为设计和可靠地预测各种钢管的屈服强度提供了一个好主意。

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Yield-strength prediction of flattened steel pipes by competing Bauschinger effect and strain hardening during pipe-forming.

Since flattened steel sheets often show the unexpectedly lower or higher yield strength than leveled sheets, unceasing efforts have been made to accurately predict the yield strength in pipe-forming industries. In the present investigation, the yield strength of line-pipe or casing-pipe steels was predicted by competing Bauschinger effect and strain hardening occurred during the pipe-forming. Yield drop (YD) and yield rise (YR) parameters were newly defined from cyclic simulation analyses of outer and inner walls of pipes to express more reasonably the Bauschinger effect and strain hardening. The YD increased abruptly until the pre-strain of about 1%, and then saturated, while the YR increased linearly with increasing pre-strain. By combining the YD and YR, the variation in yield strength (Δσ) showed a down-and-up behavior as the Bauschinger effect and strain hardening were dominant at low and high pre-strains, respectively, and plausibly explained the relationship of Δσ and piping strain used in pipe-forming industries. According to the microstructural analyses related to the down-and-up Δσ behavior, the polygonal ferrite reduced the yield-strength reduction in the low pre-strain range, whereas the granular bainite or pearlite expanded it. This yield strength prediction coupled with microstructural analyses provide a good idea for designing and reliably predicting the yield strength of in various steel pipes.

更新日期：2019-09-30

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