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Investigations on hot deformation behaviors and abnormal variation mechanisms of flow stress at elevated temperature for X45CrSi93 valve steel

机译:X45CrSi93阀钢在高温下的热变形行为和高温流变异常机理的研究。

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摘要

The hot deformation behavior of X45CrSi93 valve steel was investigated by a series of compression and tensile tests by means of the Gleeble-1500 simulator and microstructural analyses. The experimental results show that the flow stress decreases with the increasing temperature between 850 and 900 ℃ followed by an abnormal increase with the increasing temperature between 900 and 1000 ℃ under the compressive conditions. A normal decrease of the flow stress is continued with the increasing temperature above 1000 ℃. Meantime, the tensile specimen conducted at 1000 ℃ shows double necking effect. Further microstructural analyses show that the phase transition from α-ferrite to austenite and the solution strengthening caused by carbide dissolution are the main reasons for abnormal variation of flow stress for X45CrSi93. The negative temperature gradient in the tensile specimen results in the symmetrical microstructure and then the double necking phenomenon.
机译:X45CrSi93阀钢的热变形行为通过Gleeble-1500模拟器和微观结构分析,通过一系列压缩和拉伸试验进行了研究。实验结果表明,在压缩条件下,流动应力随温度的升高在850〜900℃范围内减小,然后随着温度的升高在900〜1000℃范围内异常增大。随着温度升高到1000℃以上,流动应力继续正常下降。同时,在1000℃下进行的拉伸试样显示出双颈缩效果。进一步的微观结构分析表明,X45CrSi93的流动应力异常变化的主要原因是从α-铁素体到奥氏体的相变以及碳化物溶解引起的固溶强化。拉伸试样中的负温度梯度导致对称的微观结构,然后出现双颈现象。

著录项

  • 来源
    《Journal of Materials Research》 |2015年第10期|1715-1726|共12页
  • 作者单位

    School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;

    School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;

    MCC Capital Engineering & Research Incorporation Limited, Beijing 100176, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
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