针对1种800MPa级高强钢的调质过程,分析了不同淬火温度和回火温度对实验钢力学性能和组织的影响。结果表明：淬火温度在880～920℃之间时,随着淬火温度升高,实验钢的强度逐渐降低,-40℃冲击韧性是先升高后降低,并在900℃达到最大;回火温度在550～700℃之间,随着回火温度的升高,实验钢的强度逐渐下降,-40℃冲击韧性逐渐升高;实验钢在900℃淬火,600℃回火时,具有最佳的综合力学性能。
The quenching and tempering process of 800 MPa high strength low alloy steel was researched,the effect of different quenching and tempering temperatures on mechanical properties and microstucture of tested steel were analyzed.The results showed that when the quenching temperature was between 880 ℃ and 920 ℃,the strength decreased with the increase of quenching temperature,while the impact toughness at-40 ℃ increased first and then decreased and reached the maximum at 900 ℃.As the tempering temperature was between 550 ℃ and 700 ℃,the strength of tested steel decreased gradually while the impact toughness at-40℃ increased with the increase of tempering temperature.The tested steel quenched at 900 ℃ and then tempered at 600 ℃ has best mechanical properties.
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