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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Cooling Rate on Microstructure and Mechanical Properties of Eutectoid Steel Under Cyclic Heat Treatment
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Effect of Cooling Rate on Microstructure and Mechanical Properties of Eutectoid Steel Under Cyclic Heat Treatment

机译：冷却速率对循环热处理下共析钢组织和力学性能的影响

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摘要

A systematic study has been carried out to ascertain the effect of cooling rate on structure and mechanical properties of eutectoid steel subjected to a novel incomplete austenitization-based cyclic heat treatment process up to 4 cycles. Each cycle consists of a short-duration holding (6 min) at 775 degrees C (above A(1)) followed by cooling at different rates (furnace cooling, forced air cooling and ice-brine quenching). Microstructure and properties are found to be strongly dependent on cooling rate. In pearlitic transformation regime, lamellar disintegration completes in 61 h and 48 min for cyclic furnace cooling. This leads to a spheroidized structure possessing a lower hardness and strength than that obtained in as-received annealed condition. On contrary, lamellar disintegration does not occur for cyclic forced air cooling with high air flow rate (78 m(3) h(-1)). Rather, a novel microstructure consisting of submicroscopic cementite particles in a 'interweaved pearlite' matrix is developed after 4 cycles. This provides an enhancement in hardness (395 HV), yield strength (473 MPa) and UTS (830 MPa) along with retention of a reasonable ductility (% Elongation = 19) as compared to as-received annealed condition (hardness = 222 HV, YS = 358 MPa, UTS = 740 MPa, % Elongation = 21).
机译：已经进行了系统研究，以确定冷却速率对浓度钢的结构和力学性能的影响，其对新的不完全奥氏体化的循环热处理过程的循环热处理过程高达4个循环。每个循环包括在775摄氏度（高于A（1））的短时间保持（6分钟），然后以不同的速率冷却（炉冷却，强制空气冷却和冰盐淬火）。发现微观结构和性质强烈依赖于冷却速率。在珠光体转化制度中，层状崩解在61小时和48分钟内完成循环炉冷却。这导致具有比在接收的退火条件下获得的低硬度和强度的球化结构。相反，对于具有高空气流速的循环强制空气冷却（78m（3）H（-1）），不会发生层状崩解。相反，在4个循环后开发了由“交织的珠光体基质中的亚微晶渗碳岩颗粒组成的新型微观结构。这提供了硬度（395HV）的增强，屈服强度（473MPa）和UTS（830MPa）以及与接收的退火条件相比保留合理的延展性（％伸长率= 19）（硬度= 222HV， YS = 358 MPa，UTS = 740MPa，％伸长率= 21）。

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