• CN：11-2187/TH
  • ISSN：0577-6686
机械工程学报

›› 2004, Vol. 40 ›› Issue (7): 141-144.

• 论文 • 上一篇    下一篇

40Cr钢低温超塑性的研究

许晓静;施连杰;程晓农;蔡兰;吉平平   

  1. 江苏大学机械工程系;河北邮电器材机械厂
  • 发布日期:2004-07-15

INVESTIGATION ON LOW TEMPERATURE SUPERPLASTICITY OF 40Cr STEEL

Xu Xiaojing;Shi Lianjie;Cheng Xiaonong;Cai Lan;Ji Pingping   

  1. School of Mechanical Engineering, Jiangsu University Hebei Post and Telecommunication Equipment Machinery Factory
  • Published:2004-07-15

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摘要： 研究了40Cr钢的低温超塑性。结果表明：经3次840 ℃×40 min水淬+650 ℃×2 h回火的超塑性预处理后，40Cr钢的组织为回火索氏体，晶粒尺寸为5~10 mm，在温度为650 ℃、初始应变速率为3.16×10–4 s–1的拉伸变形条件下，流变应力为108.1 Mpa，断后伸长率为254%，应变速率敏感性指数m值为0.221，超塑变形的主要机制可描述为原子扩散控制的晶界滑动。

关键词: 40Cr钢, 超塑性, 低温, 微观结构

Abstract: The low temperature superplastic characteristics, of commercial 40Cr steel that is 3 cycles water-quenched and subsequent high-temperature tempered, are investigated. The results show that the 40Cr steel has a fine grain of 5~10 mm, and exhibited a elongation of 254%, a flow stress of 108.1 Mpa and a strain rate sensitivity m-value of 0.221 at the temperature of 650 ℃ and at the initial strain rate of 3.16′10–4 s–1. The primary superplastic deformation mechanism is thought to be atom-diffusion-controlled grain boundary sliding.

Key words: 40Cr steel, Low temperature, Microstructure, Superplasticity

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