中文摘要：

分析了60Si2CrVAT弹簧钢在相同淬火（910℃×30 min）条件下,不同回火温度（400～520℃）对材料组织及力学性能的影响。结果表明,60Si2CrVAT弹簧钢经910℃×30 min油冷淬火及430℃×60 min回火后,强度和韧性相对较佳。400～520℃回火温度下,随回火温度的升高,强度及硬度下降,伸长率和断面收缩率先升后降。当回火温度为430℃时,应变硬化指数n值最大为0.086。回火后组织均为回火屈氏体,随回火温度升高,针叶状铁素体有长大趋势,残留奥氏体大量分解。

英文摘要：

Under the same quenching process（ 910 ℃ × 30 min）,influence of different tempering temperature（ 400-520 ℃） on microstructure and mechanical properties of 60Si2 Cr VAT spring steel was investigated. The results show that quenched at 910 ℃ for 30 min and tempered at 430 ℃ for 60 min,the strength and toughness of the steel is best. With tempering temperature increased from 400 ℃ to520 ℃,the strength and hardness of the steel decrease,and the elongation and contraction of cross sectional area first increase and then decrease. When tempering temperature is 430 ℃,the strain hardening exponent reaches the maximum value 0. 086. The microstructures of spring steel tempered between 400 ℃ and 520 ℃ are tempering troostite,and needle-shaped ferrit tends to grow up and the residual austenite is decomposed with the temperature increasing.