首页> 美国卫生研究院文献>Materials >Effect of Isothermal Transformation Times below Ms and Tempering on Strength and Toughness of Low-Temperature Bainite in 0.53 C Bainitic Steel
【2h】

Effect of Isothermal Transformation Times below Ms and Tempering on Strength and Toughness of Low-Temperature Bainite in 0.53 C Bainitic Steel

机译:Ms以下回火和回火等温时间对0.53 C贝氏体钢中低温贝氏体强度和韧性的影响

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

This study aims to investigate the microstructures, strength, and impact toughness of low-temperature bainite obtained by isothermal transformation at temperature below Ms (Martensite Starting temperature) for different times and tempering process in 0.53 C wt% bainitic steel. By using the optical microscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), electron back scatter diffraction (EBSD), and mechanical property test, it was found that the microstructures after heat treatment consist of small amounts of martensite, fine bainite, and film retained austenite. After tempered at 250 °C for 2 h, the volume fraction of retained austenite (10.9%) in the sample treated by isothermal transformation at 220 °C for three hours is almost the same as that of the sample without tempering. In addition, the retained austenite fraction decreases with the increase of holding times and is reduced to 6.8% after holding for 15 h. The ultimate tensile strength (1827 MPa), yield strength (1496 MPa), total elongations (16.1%), and impact toughness (up to 58 J/cm ) were obtained by isothermal transformation at 220 °C for three hours and tempered at 250 °C. Whereas, the impact toughness of sample without tempering is 28 J/cm . After holding for 15 h, the impact toughness raises to 56 J/cm , while the ductility and strength decreases. These results indicate that the tempering process is helpful to improve the impact toughness of low-temperature bainite.
机译:本研究的目的是研究在0.53 C wt%贝氏体钢中,在低于Ms(马氏体起始温度)的温度下,经过不同时间和回火过程,通过等温转变获得的低温贝氏体的组织,强度和冲击韧性。通过光学显微镜,X射线衍射(XRD),透射电子显微镜(TEM),电子背散射衍射(EBSD)和力学性能测试,发现热处理后的显微组织由少量的马氏体组成,细贝氏体,并且薄膜保留奥氏体。在250°C下回火2 h后,在220°C下等温转变3小时后处理的样品中残留奥氏体的体积分数(10.9%)与未回火的样品几乎相同。此外,残余奥氏体分数随保持时间的增加而降低,并在保持15小时后降至6.8%。通过在220°C下等温转变三小时并在250℃下回火,获得极限抗拉强度(1827 MPa),屈服强度(1496 MPa),总伸长率(16.1%)和冲击韧性(最高58 J / cm)。 ℃。而未经回火的样品的冲击韧性为28 J / cm。保持15小时后,冲击韧性提高到56 J / cm,而延展性和强度降低。这些结果表明,回火过程有助于提高低温贝氏体的冲击韧性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号