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材料工程  2016, Vol. 44 Issue (3): 77-83    DOI: 10.11868/j.issn.1001-4381.2016.03.013
  材料与工艺 本期目录 | 过刊浏览 | 高级检索 |
高强钢20MnTiB多工位冷镦变形行为
肖志玲1, 刘百宣1, 孙红星1,2, 刘华1
1. 郑州机械研究所, 郑州 450001;
2. 西安交通大学机械工程学院, 西安 710049
Multi-stage Cold Forging Behavior of High Strength Steel 20MnTiB
XIAO Zhi-ling1, LIU Bai-xuan1, SUN Hong-xing1,2, LIU Hua1
1. Zhengzhou Research Institute of Mechanical Engineering, Zhengzhou 450001, China;
2. School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
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摘要 通过对高强螺栓多工位冷镦变形分区的金属流动、显微组织、力学性能及其变化规律进行分析,并采用Deform-3D数值模拟和实际产品成形相结合的方法,来研究高强材料的多工位冷镦变形行为。结果表明:多工位冷镦变形属于低动态变形;大、小变形区的宏观流线和显微组织有明显的"遗留性",而难变形区由于高强材料的"包辛格效应",铁素体由拉长的晶粒变成等轴晶粒,而珠光体的带状消失,组织"遗留性"最差;通过低动态多工位冷镦变形,20MnTiB高强钢微观组织中铁素体和珠光体均发生了形变强化,且硬度值的增幅相近。
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肖志玲
刘百宣
孙红星
刘华
关键词 高强金属材料变形分区遗留性形变强化    
Abstract:In order to study the multi-stage cold forging behavior of high strength metallic,the metal flow,microstructure and mechanical properties variation were discussed which the high strength bolts deformation division areas were formed by multi-stage cold forging technology,and used both Deform-3D numerical simulation and actual product deformation methods. The results show that multi-stage cold forging deformation belongs to low dynamic deformation; microstructure and flow lines of big /small deformation areas have obvious "carryover effect"; due to high strength materials "Bauschinger effect",the ferrite grains is changed into equiaxed grains from elongated grains in difficult deformation area while the pearlite band is disappeared,so that the"carryover effect"of microstructure is worst in this deformation area; Both pearlite and ferrite in the microstructure of 20MnTiB high strength steel occur working hardening by low dynamics multi-stage cold forging deformation,and the magnitude of increasing hardness number of the pearlite is fairly near ferrite.
Key wordshigh strength metallic materials    deformation areas    carryover effect    working hardening
收稿日期: 2014-11-06      出版日期: 2016-03-22
中图分类号:  TG376.2  
通讯作者: 刘华(1962-),男,博士生导师,主要从事冷热精密锻造的研究,联系地址:郑州市新技术开发区枫场街10号郑州机械研究所锻压室(450001),E-mail:13903832971@163.com     E-mail: 13903832971@163.com
引用本文:   
肖志玲, 刘百宣, 孙红星, 刘华. 高强钢20MnTiB多工位冷镦变形行为[J]. 材料工程, 2016, 44(3): 77-83.
XIAO Zhi-ling, LIU Bai-xuan, SUN Hong-xing, LIU Hua. Multi-stage Cold Forging Behavior of High Strength Steel 20MnTiB. Journal of Materials Engineering, 2016, 44(3): 77-83.
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