Zheng Bing,Xu Dong,Wang Yiqun,et al.Verification and Application of Austenite Grain Growth Model in 34CrNi3MoV Steel[J].Special Steel,2023,44(06):101-106.
Zheng Bing,Xu Dong,Wang Yiqun,et al.Verification and Application of Austenite Grain Growth Model in 34CrNi3MoV Steel[J].Special Steel,2023,44(06):101-106. DOI: 10.20057/j.1003-8620.2023-00024.
Verification and Application of Austenite Grain Growth Model in 34CrNi3MoV Steel
The effects of heating temperature and holding time on austenitic grain growth behavior of 34CrNi3MoV steel were studied by heat treatment test and metallography.The results show that the effect of heating temperature on austenitic grain size of 34CrNi3MoV steel is particularly significant, and the grain size increases gradually with the increase of heating temperature (900-1 200 ℃). In the case of initial grain size, both 900 ℃ holding for 30 min(12.1 μm) and 950 ℃ holding for 10 min (15.1 μm) have little difference with the original grain size level, and 1 050 ℃ holding for 30 min(37.8 μm), The activation energy Q of grain growth of 34CrNi3MoV steel is 176.6 kJ/mol when the grain size is 3.35 times of the original grain size. With the extension of holding time, the influence of heating temperature on austenite grain size becomes weaker and weaker. At 950 ℃, the critical holding time for grain growth is about 90 min. At 1 050 ℃, the critical holding time is about 30 min. The higher the heating temperature, the slower the grain growth after reaching the critical holding time. The heating temperature is 850-950 ℃ and the holding time is 60-180 min, which can make the average grain size of 34CrNi3MoV steel controlled in 22.5-44.9 μm(national standard 8.0-6.0) and meet the requirements.
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