摘要
研究了低碳低合金铌微合金化钢经轧制快速冷却后回火过程中组织与力学性能的变化。结果表明,低碳低合金铌微合金化钢回火时弥散强化随钢中Nb含量的升高而增强。当钢中Nb含量高于0.042%时,抗拉强度及屈服强度在600℃回火2 h达到峰值。含0.023%Nb的钢在550℃回火时的抗拉强度达到最高值,而屈服强度在550℃和650℃回火时出现双峰值。低于600℃回火,全部试验钢中观察到回火贝氏体,700℃回火时,回火贝氏体消失,形成平衡组织。
The evolution of the microstructure and mechanical properties of the Nb microalloyed C-Mn high strength low alloy （HSLA） steels tempered after hot rolling and high-speed cooling was studied. The results show that the precipitation strengthening increased with the increase of Nb content in the steels. The tensile and yield strengths of the steels with Nb concentration high than 0. 042% reached the peak values when tempered at 600 ℃ for 2 h. The steel containing 0. 023% Nb tempered at 550 ℃ had the highest tensile strength, while the yield strength exhibited two peak values when tempered at 550 ℃ and 650 ℃. Tempered bainite structure was observed in all of the test steels tempered at less than 600 ℃ and disappeared when tempered at 700 ℃ for 2 h and the equilibrium microstructure was formed.
出处
《金属热处理》
EI
CAS
CSCD
北大核心
2007年第6期27-29,共3页
Heat Treatment of Metals
