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    退火温度对淬火配分后热轧高强钢显微组织和力学性能的影响

    Effect of Annealing Temperature on Microstructure and Mechanical Properties of Hot Rolled High Strength Steel After Quenching-Partitioning

    • 摘要: 将热轧高强钢升温至不同温度(780,810,840,870 ℃)保温退火600 s后进行200 ℃×60 s淬火+410 ℃×300 s配分处理,研究了退火温度对其显微组织和力学性能的影响。结果表明:随着退火温度升高,淬火配分后试验钢中铁素体和马奥岛含量减少,回火马氏体、残余奥氏体和贝氏体含量增加;随着退火温度升高,抗拉强度先减小后增大,屈服强度、断后伸长率、屈强比和冲击吸收功均先增大后减小;840 ℃退火温度下淬火配分后试验钢的强度、塑性和韧性匹配优异,抗拉强度(830 MPa)较大,屈服强度(585 MPa)、断后伸长率(39.6%)、屈强比(0.70)和冲击吸收功(−20,−40 ℃环境下分别为28.35,27.69 kJ)最大。

       

      Abstract: The hot rolled high strength steel was heated to different temperatures (780, 810, 840, 870 ℃) and kept warm for 600 s to anneal, and then was subjected to 200 ℃×60 s quenching+410 ℃×300 s partitioning heat treatment. The effects of annealing temperature on microstructure and mechanical properties were studied. The results show that with the increase of annealing temperature, the content of ferrite and martensite-autensite island in test steel after quenching-partitioning decreased, while the content of tempered martensite, residual austenite and bainite increased. With the increase of annealing temperature, the tensile strength decreased first and then increased, and the yield strength, percentage elongation after fracture, ratio of yield to strength and impact absorption work increased first and then decreased. The strength, plasticity and toughness of the test steel after quenching-partitioning at annealing temperature of 840 ℃ were well matched, the tensile strength (830 MPa) was large, the yield strength (585 MPa), the percentage elongation after fracture (39.6%), the ratio of yield to strength (0.70) and the impact absorption work reached the maxium values (28.35, 27.69 kJ, respectively, at −20,−40 ℃).

       

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