• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Science and Technology of Advanced Materials >Effect of rolling reduction on ultrafine grained structure and mechanical properties of low-carbon steel thermomechanically processed from martensite starting structure
【24h】

Effect of rolling reduction on ultrafine grained structure and mechanical properties of low-carbon steel thermomechanically processed from martensite starting structure

机译：压下量对马氏体起始组织热机械加工低碳钢超细晶组织和力学性能的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The present authors have invented a novel and simple thermomechanical processing to realize the ultrafine grained microstructure in carbon steels. The key of the process is to start from martensite structure. In the previous study, it has been clarified that conventional cold-rolling to a reduction in thickness of only 50% (equivalent strain of 0.8) and subsequent annealing at warm temperature around 500℃ fabricates the multi-phased ultrafine grained structure composed of the ultrafine ferrite grains with mean grain size of 180 nm, uniformly precipitated nano cementite and tempered martensite. In this study, the effect of the rolling reduction ranging from 25 to 70% (equivalent strains of 0.3 -1.5) on the ultrafine grained structure and the mechanical properties of the plain low-carbon steel (Fe-0.13 wt% C) processed from martensite starting structure was studied. In the as-deformed specimen, the area fraction of the region showing the lamellar structure, which is typical for severely rolled metals, increased with increasing the rolling reduction and the strength also increased. After annealing at warm temperature around 500℃, the multi-phased ultrafine grained microstructures were obtained in all the examined rolling reductions. The area fraction of the region showing the ultrafine ferrite grains increased with increasing the rolling reduction. At higher temperature, conventional recrystallization took place, and the recrystallization temperature became lower with increasing the reduction. Tensile test exhibited that the specimen rolled to the intermediate reduction (50%) performed the best strength-ductility balance (870 MPa of tensile strength and 9% of uniform elongation). The reason for the good strength-ductility balance of the specimen rolled to the intermediate reduction was discussed on the basis of the observed microstructures.
机译：本发明人已经发明了新颖且简单的热机械加工方法，以实现碳钢中的超细晶粒组织。该过程的关键是从马氏体结构开始。在先前的研究中，已经阐明了传统的冷轧至仅将厚度减小50％（等效应变为0.8）并随后在500℃左右的温暖温度下进行退火，即可制成由超细纤维组成的多相超细晶粒组织。铁素体晶粒，平均晶粒尺寸为180 nm，均匀沉淀的纳米渗碳体和回火马氏体。在这项研究中，压延率范围从25％到70％（当量应变为0.3 -1.5）对超细晶粒组织和加工的普通低碳钢（Fe-0.13 wt％C）的机械性能的影响。研究了马氏体的起始结构。在变形后的样品中，显示出层状结构的区域的面积分数（对于严重的轧制金属而言是典型的）随着轧制率的增加而增加，并且强度也增加。在500℃左右的高温下退火后，在所有测试的轧制压下率下均获得了多相超细晶粒组织。显示超细铁素体晶粒的区域的面积分数随着轧制率的增加而增加。在较高的温度下，发生常规的重结晶，并且随着减少量的增加，重结晶温度降低。拉伸试验表明，轧制至中间压下率（50％）的试样表现出最佳的强度-延展性平衡（抗拉强度为870 MPa，均匀伸长率为9％）。基于观察到的显微组织，讨论了轧制至中间压下率的试样强度和延展性平衡良好的原因。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

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