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首页> 外文期刊>Materials Science and Engineering >Effects of stress relief tempering on microstructure and tensile/impact behavior of quenched and partitioned commercial spring steel
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Effects of stress relief tempering on microstructure and tensile/impact behavior of quenched and partitioned commercial spring steel

机译：应力回火对淬火和分区商用弹簧钢的组织和拉伸/冲击行为的影响

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摘要

The primary aim of the present study was to investigate the impacts of tempering (at 200-300 degrees C) on microstructure and mechanical properties of commercial spring steel of 60Si2CrV grade under "Quenching and Partitioning" heat treatment. Three different heat treatment routes were applied: (a) oil quenching and tempering at 300 degrees C (Q-T), (b) bath quenching at 160 degrees C followed by partitioning at 300 degrees C for 300 s (Q-P), and (c) the same Q-P treatment followed by tempering at 200 degrees C, 250 degrees C, and 300 degrees C for 90 min (Q-P-T), and it was found that due to the formation of tempered martensite/carbide-free bainite/retained austenite (16 vol%) structure, QP treatment significantly improved the tensile/impact behavior of spring steel as compared to the Q-T treatment. Moreover, stress relief tempering at 200-300 degrees C caused a two-fold increase in ductility (up to 9%) and manifested improved ultimate tensile strength (2022-2065 MPa) and U-notched impact toughness (64-64 J/cm(2)) in comparison to Q-P treatment. Further, tempering at 200-250 degrees C resulted in the impact fracture of steel in combination of quasi-cleavage facets with dimpled ruptured profile; tempering at 250-300 degrees C led to the partial transformation of retained austenite into bainite accompanied with increase in carbon content in austenite; tempering at 300 degrees C caused 30% decrease in impact toughness of spring steel as compared to Q-P treatment due to the formation of cementite carbide precipitation. In addition, the structural properties of spring steel in different tempering stages were analyzed using SEM, TEM, XRD, dilatometric and magnetometric measurements.
机译：本研究的主要目的是研究在“淬火和分配”热处理下回火（200-300摄氏度）对60Si2CrV级商用弹簧钢的组织和力学性能的影响。应用了三种不同的热处理途径：（a）在300摄氏度（QT）进行油淬和回火，（b）在160摄氏度进行浴淬火，然后在300摄氏度下分配300 s（QP），以及（c）进行相同的QP处理，然后在200°C，250°C和300°C下回火90分钟（QPT），发现由于回火马氏体/无碳化物的贝氏体/残余奥氏体的形成（16体积％的结构，QP处理与QT处理相比显着改善了弹簧钢的拉伸/冲击性能。此外，在200-300摄氏度的温度下进行的应力回火导致延展性提高了两倍（最高9％），并表现出提高的极限抗拉强度（2022-2065 MPa）和U形缺口冲击韧性（64-64 J / cm） （2））相比于QP治疗。此外，在200-250摄氏度的温度下回火会导致钢的冲击断裂，并结合了具有开裂轮廓的准解理面。在250-300摄氏度下回火导致残余奥氏体部分转变为贝氏体，同时奥氏体中的碳含量增加；由于形成渗碳碳化物沉淀，与Q-P处理相比，在300℃下回火导致弹簧钢的冲击韧性降低了30％。此外，还使用SEM，TEM，XRD，膨胀计和磁力测量法分析了不同回火阶段的弹簧钢的结构性能。

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