火烧温度和冷却方式对12Cr1MoV钢显微组织和力学性能的影响
Effect of Burning Temperature and Cooling Way on Microstructure and Mechanical Properties of 12Cr1MoV Steel
摘 要
将12Cr1MoV钢加热至不同温度(650,750,850,950,1 050,1 150℃)保温3 h并分别进行空冷和水冷来模拟火灾现场的火烧过程,采用金相检测、小冲杆试验、拉伸试验和硬度测试研究了火烧温度和冷却方式对试验钢显微组织和力学性能的影响。结果表明:当火烧温度不高于750℃时,空冷和水冷方式下试验钢的显微组织均主要为铁素体、珠光体和碳化物,强度、断后伸长率和硬度随火烧温度的变化很小;在空冷方式下,当火烧温度高于750℃时,随着火烧温度升高,试验钢的晶粒尺寸变大,珠光体含量增加,使得强度增大,断后伸长率降低;在水冷方式下,当火烧温度高于750℃时,试验钢组织中出现马氏体,随着火烧温度升高,马氏体含量增加,试验钢强度和硬度提高,断后伸长率降低。
小冲杆试验
火烧温度
冷却方式
强度
显微组织
12Cr1MoV steel
small punch test
burning temperature
cooling way
strength
microstructure
Abstract
12Cr1MoV steel was heated to different temperatures (650, 750, 850, 950, 1 050,1 150 °C) for 3 h and then air-cooled and water-cooled, respectively, to simulate the burning process at fire sites. The effect of the burning temperature and cooling way on the microstructure and mechanical properties of the test steel was studied by metallographic inspection, small punch tests, tensile tests and hardness measurement. The results show that when the fire temperature was not higher than 750 ℃, the microstructure of the test steel mainly consisted of ferrite, pearlite and carbide under air cooling and water cooling, and the change of strength, percentage elongation after fracture and hardness was small with the burning temperature. Under air cooling, when the burning temperature was higher than 750 ℃, the test steel experienced an increase in grain size and pearlite conten, leading to an increase in strength and a decrease in percentage elongation after fracture. Under water cooling, when the burning temperature was higher than 750 ℃, martensite appeared in the structure of the test steel. The content of martensite increased with the burning temperature rising, resulting in an increase in strength and hardness and a decrease in percentage elongation after fracture of the test steel.
中图分类号 TB132.3 DOI doi: 10.11973/jxgccl202303006
所属栏目 试验研究
基金项目 国家磁约束核聚变能发展研究专项资助项目(2022YFE03120000)
收稿日期 2021/10/22
修改稿日期 2022/10/18
网络出版日期
作者单位点击查看
联系人作者关凯书
备注李小凯(1992-),男,湖北荆州人,硕士研究生
引用该论文: LI Xiaokai,GUAN Kaishu. Effect of Burning Temperature and Cooling Way on Microstructure and Mechanical Properties of 12Cr1MoV Steel[J]. Materials for mechancial engineering, 2023, 47(3): 31～36
李小凯,关凯书. 火烧温度和冷却方式对12Cr1MoV钢显微组织和力学性能的影响[J]. 机械工程材料, 2023, 47(3): 31～36
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【7】SONG M,GUAN K S,QIN W,et al.Comparison of mechanical properties in conventional and small punch tests of fractured anisotropic A350 alloy forging flange[J].Nuclear Engineering and Design,2012,247:58-65.
【8】钟继如.基于混合粒子群算法的小冲杆试验预测材料强度的研究[D].上海:华东理工大学,2019. ZHONG J R.Study on predicting material strength using small punch test and hybride particle swarm optimization[D].Shanghai:East China University of Science and Technology,2019.
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