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粉末冶金材料科学与工程  2019, Vol. 24 Issue (3): 220-225    
  工艺技术 本期目录 | 过刊浏览 | 高级检索 |
热处理工艺对建筑用490 MPa级耐火钢力学性能的影响
陈俊, 罗恒勇, 林申正
宜宾职业技术学院,宜宾 644003
Effect of heat treatment technology on the mechanical property of 490 MPa grade fire-resistance steel
CHEN Jun, LUO Hengyong, LIN Shenzheng
Yibin Vocational and Technical College, Yibin 644003, China
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摘要 研究不同正火温度下NSFR490耐火钢的显微组织与力学性能。结果表明,正火处理温度在730~820 ℃区间内,耐火钢的强度随温度升高而下降,但仍可满足工程应用的标准要求,且塑性得以提高(伸长率由20%升至26%)。在600 ℃进行拉伸试验,结果满足高温屈服强度大于室温屈服强度2/3的要求。耐火钢经过600 ℃高温回火工艺,显微组织整体变化不大,仅晶粒尺寸略有长大,这与耐火钢在高温下的力学性能(屈服强度由315 MPa降至292 MPa)表现一致。最后结合该耐火钢的实际工程应用,利用ANSYS软件对其进行结构失稳临界温度计算,获得了该材料的位移-温度曲线,并得出其失效临界温度点为620 ℃。
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陈俊
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关键词 耐火钢热处理显微组织力学性能有限元    
Abstract:Taking NSFR490 fire-resistant steel as an example, the changes of its metallographic organization and mechanical properties at different normalizing temperatures were studied. The results show that under the normalizing treatment for 730-820 ℃, the strength decreases with the increase of temperature, but it still meets the engineering application standard. Otherwise, the plasticity is improved (elongation rate increased from 20% to 26%). The tensile test at 600 ℃ satisfy the requirement of high temperature yield strength greater than 2/3 of room temperature yield strength. Further observation of the microstructure of NSFR 490 fire-resistant steel shows that the overall microstructure of the alloy has little change under a high temperature process of 600 ℃, and only the grain size has grown slightly, which is consistent with the mechanical properties of refractory steel at high temperature (yield strength decreased from 315 MPa to 292 MPa). At last, combined with the practical engineering application of the refractory steel, the displacement- temperature curve and failure critical temperature point 600 ℃ of the material are obtained by using ANSYS software.
Key wordsfire-resistent steel    heat treatment    microstructure    mechanical property    finite element
收稿日期: 2018-11-10      出版日期: 2019-07-11
ZTFLH:  TF124.83  
通讯作者: 陈俊,讲师。电话:0831-8272187;E-mail: feng_song168@sina.com   
引用本文:   
陈俊, 罗恒勇, 林申正. 热处理工艺对建筑用490 MPa级耐火钢力学性能的影响[J]. 粉末冶金材料科学与工程, 2019, 24(3): 220-225.
CHEN Jun, LUO Hengyong, LIN Shenzheng. Effect of heat treatment technology on the mechanical property of 490 MPa grade fire-resistance steel. Materials Science and Engineering of Powder Metallurgy, 2019, 24(3): 220-225.
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