论文部分内容阅读
为了进一步降低硼镍复合添加的含铌低合金高强度(HSLA)H型钢的韧脆转变温度。将试验钢在910℃淬火后,分别在550、600和650℃回火2 h,通过拉伸试验和夏比冲击试验对其力学性能,特别是低温冲击韧性进行了测试,使用XRD、SEM、HRTEM以及EDS对其组织和成分进行了分析。结果表明:淬火回火处理后,试验钢具有优异的强韧性配合,其韧脆转变温度降低到-70℃以下,并且-90℃时的冲击功仍在100 J左右;回火后韧性的提高主要是基体回复、再结晶的结果;回火时析出的成分复杂的碳化物有利于抑制再结晶晶粒的长大,使组织细化,细小弥散的非连续析出碳化物对韧性影响不大。
In order to further reduce the ductile-brittle transition temperature of niobium-containing low-alloy high-strength (HSLA) H-section steels added with boron-nickel composite. After the test steels were quenched at 910 ℃, they were tempered at 550,600 and 650 ℃ for 2 h respectively. The mechanical properties, especially the low-temperature impact toughness, were tested by tensile test and Charpy impact test. XRD, SEM, HRTEM and EDS analyzed its organization and composition. The results show that after quenching and tempering, the test steel has excellent strength and toughness, the ductile-brittle transition temperature is lower than -70 ℃, and the impact energy at -90 ℃ is still about 100 J; the toughness after tempering Mainly matrix recovery, the results of recrystallization; tempering precipitated complex carbide is conducive to inhibiting the recrystallization grain growth, so that the organization refinement, fine dispersion of non-continuous precipitation of carbide on toughness little effect.