摘要
为了获得具有高强韧性以及低屈强比的建筑抗震钢板,研究了回火热处理对热轧态钢板组织与性能的影响。结果表明,随着回火温度的升高,建筑钢板的抗拉强度整体呈现逐渐降低的趋势,而屈服强度基本不变或者略有降低,断后伸长率逐渐升高;当回火温度为300~450℃时,0℃和一20℃冲击功基本保持不变,但回火温度达到500℃及以上时,冲击功有明显降低;随着回火温度的升高,建筑钢板的屈强比呈现逐渐上升的趋势,回火温度在450℃及以下时才符合建筑抗震钢板屈强比≤0.85的要求;随着回火温度的升高,建筑钢板中板条贝氏体逐渐合并长大而形成块状组织,链条状和块状的M/A组织逐渐分解,位错密度下降,但是当回火温度为500℃和600℃时会析出起弥散强化作用的纳米级ε-Cu相。
The effects of tempering heat treatment on the microstructure and properties of hot rolled steel plate was studied to obtain the building aseismic steel plate with high strength and toughness and low yield ratio. The results show that,with the increase of the tempering temperature, the tensile strength of the building steel plate decreases gradually, however, the yield strength is basically unchanged or slightly decreases, and the elongation after breaking increases gradually. When the tempering temperature is 300-450 ℃, the impact energy at 0 ℃ and-20 ℃ remains basically unchanged. When the tempering temperature reaches 500 ℃ and above, the impact energy decreases obviously. With the increase of tempering temperature, the yield ratio of building steel plate increases gradually, and the yield tatio meets the requirement of 0.85 the when tempering temperature is 450 ℃ or below. With the increase of the tempering temperature, the lath bainite in the building steel plate sheet gradually merges and grows to form massive microstructure. The chain-like and block-like M/A microstructure gradually decomposes and the dislocation density decreases. However, when the tempering temperature is 500℃ and 600 ℃, the nano-scale ε-Cu phase with dispersion strengthening effect precipitates.
作者
程旭洋
辛宇
孙芳
童伟
CHENG Xuyang;XIN Yu;SUN Fang;TONG Wei(Department of Civil Engineering,Inner Mongolia Traffic Polytechnic,Chifeng 024002,China;School of Civil Engineering and Architecture,Yurman Business School,Kunming 650000,China;School of Materials and Metallurgy, Wuhan University of Science and Technology,Wuhan 430081,China)
出处
《热加工工艺》
CSCD
北大核心
2018年第22期209-213,共5页
Hot Working Technology
关键词
钢板
回火工艺
屈强比
力学性能
显微组织
steel plate
tempering process
yield ratio
mechanical properties
microstructure
