Effect of Annealing Temperature on Microstructure and Mechanical Properties of Hot Rolled High Strength Steel After Quenching-Partitioning
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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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图 3 不同退火温度下淬火配分后试验钢的显微组织
Figure 3. Microstructure of test steel after quenching-partitioning at different annealing temperatures
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图 4 不同退火温度下淬火配分后试验钢的XRD谱
Figure 4. XRD pattern of test steel after quenching-partitioning at different annealing temperatures
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图 5 870 ℃退火温度下淬火配分后试验钢的SEM形貌和EDS面扫描结果
Figure 5. SEM morphology (a) and EDS surface scanning results (b–d) of test steel after quenching-partitioning at annealing temperature of 870 ℃: (b) C; (c) Mn and (d) Si
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图 6 不同退火温度下淬火配分后试验钢的工程应力-工程应变曲线
Figure 6. Engineering stress-engineering strain curves of test steel after quenching-partitioning at different annealing temperatures
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图 7 不同退火温度下淬火配分后拉伸断口中心纤维区微观形貌
Figure 7. Micromorphology of core fiber region on tensile fracture after quenching-partitioning at different annealing temperatures
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图 8 不同退火温度下淬火配分后试验钢的冲击吸收功
Figure 8. Impact absorption work of test steel after quenching-partitioning at different annealing temperatures
表 1 不同退火温度下淬火配分后试验钢的拉伸性能
Table 1 Tensile properties of test steel after quenching-partitioning at different annealing temperatures
退火温度/℃ 屈服强度/MPa 抗拉强度/MPa 断后伸长率/% 屈强比 强塑积/(MPa·%) 780 540 865 33.2 0.62 28 718 810 585 860 37.0 0.68 31 820 840 585 830 39.6 0.70 32 868 870 580 835 39.3 0.69 32 815 
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