材料研究学报  2013, Vol. 27 Issue (6): 659-664

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高Ti钢中Ti(N, C)的应变诱导析出行为

蔡 宁 鞠新华 孟振生 贾惠平 郝京丽

(首钢技术研究院 北京 100043)

Strain Induced Ti(N, C) Precipitation Behavior in Ti Contained Steels

CAI Ning* JU Xinhua MENG Zhensheng JIA Huiping Hao Jingli

(Shougang Technology Institute, Beijing 100043)

蔡 宁,鞠新华,孟振生,贾惠平,郝京丽. 高Ti钢中Ti(N, C)的应变诱导析出行为[J]. 材料研究学报, 2013, 27(6): 659-664.
. Strain Induced Ti(N, C) Precipitation Behavior in Ti Contained Steels[J]. Chinese Journal of Materials Research, 2013, 27(6): 659-664.

摘要 相关文章 Metrics 全文: PDF(4778 KB)   摘要: 采用应力松弛法研究了600-1100℃温度、30%-50%变形量条件下, Ti添加量为0.15%的高Ti钢中Ti的应变诱导析出规律。结果表明, Ti在600-1100℃温度范围内有明显的应变诱导析出过程。这种过程不只存在于单相奥氏体区, 也存在于铁素体、奥氏体两相区以及单相铁素体区。温度越低, 析出相的尺寸越小。在1000℃以上析出相的尺寸较大, 而在900℃以下析出相的尺寸在几纳米至几十纳米。当温度降低到700℃以下时, 析出相的尺寸约为3 nm。在800-1100℃温度范围内析出的开始时间约为2 s, 但开始只是少数部位的少量析出。析出是一个持续的过程, 样品不同部位的析出开始时间略有不同, 10 s以后TiC大量均匀析出。析出结束的时间在300-700 s范围内。析出时间与温度(PTT)曲线不符合“C”型特征。在30%、40%、50%三种变形量情况下, 40%变形量的变形抗力与30%的相当, 回复速度相当, 析出开始时间相同, 但是TiC的析出速度比30%时快, 弛豫后残余应力最大, 析出强化效果最明显。继续增加变形量到50%时变形抗力明显增大, 回复速度也随之增大, 但是析出开始时间由2 s推迟到2.7 s。弛豫后残余应力反而降低。 Abstract： The strain induced precipitation properties of titanium was investigated by stress relaxation method at 600 - 1100 ℃ temperature, 30% -50% deformation in high Ti contained steels with Ti addition level of 0.15% mass percent. The results show that Ti has a distinct strain-induced precipitation process at 600 - 1100 ℃ temperature range, this process is not only present in the single-phase austenite region, but also in ferrite-austenite two-phase and ferrite single-phase region. The precipitates were downsizing with the decreasing of the temperature. Above 1000℃ size of the precipitates is bigger, but below 900 ℃ precipitates with the size of a few to tens of nanometers appeared. When the temperature decreased to below 700℃, the size of precipitates downsized to 3 nm around. In the temperature range of 800 - 1100℃, the start time of the precipitation were all about 2 seconds, but just began to precipitate a small amount of precipitates at only a few parts at the beginning. Precipitation is a continuous process, and it needed different times in different parts of the sample. 10 seconds later, there would be a homogeneous precipitation process of large number of TiC, and it was ended at 300-700 seconds. The precipitation time - temperature (PTT) curve do not abide by the typical "C" curve feature. Among three deformations, 40% and 30% had similar deformation resistance, the recovery rate and the start time of precipitation, but TiC precipitated faster for 40% deformation than that of 30%. After relaxation, the residual stress was the greatest, and precipitation hardening would be the most obvious for 40%’s deformation. Increasing deformation to 50%, deformation resistance increased distinctly, and recovery became faster while the start time of precipitation delayed from 2 seconds to 2.7 seconds. After relaxation, the residual stress was the lowest for 50% deformation.      ZTFLH:  分类号 TG115   服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 44.8K 链接本文: https://www.cjmr.org/CN/      或      https://www.cjmr.org/CN/Y2013/V27/I6/659 No related articles found! Viewed Full text Abstract Cited   Shared      Discussed