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首页> 外文期刊>Materials & design >Enhancing impact fracture toughness and tensile properties of a microalloyed cast steel by hot forging and post-forging heat treatment processes
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Enhancing impact fracture toughness and tensile properties of a microalloyed cast steel by hot forging and post-forging heat treatment processes

机译：通过热锻和锻后热处理工艺提高微合金铸钢的冲击断裂韧性和拉伸性能

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摘要

In the present work, the effects of hot forging and post-forging heat treatment on the impact fracture toughness and tensile properties of a microalloyed cast steel were investigated. Mechanical tests were used to evaluate the room temperature impact fracture toughness and tensile properties of the steel. The resulting microstructures were analysed by optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM). The extraction replica technology was used to investigate the characterisation of complex precipitates formed during heat treatment. The obtained results showed that the coarse-grained microstructure of the forged specimen was significantly refined after post-forging heat treatment. Presence of complex precipitates had a favourable effect on the formation of refined austenite grains, and consequently refined final microstructure. Hot forging was beneficial to enhance the impact fracture toughness and tensile properties of the microalloyed cast steel. After 920 ℃-treatment followed by air cooling, the impact energy of the forged specimen was significantly increased from 19.3 to 208.3 J, and further enhancement in tensile properties was obtained. The enhanced impact fracture toughness and tensile properties of the microalloyed cast steel after hot forging and post-forging heat treatment were closely related to the refined and homogenised ferritic-pearlitic microstructure.
机译：在本工作中，研究了热锻和锻后热处理对微合金铸钢的冲击断裂韧性和拉伸性能的影响。使用机械测试评估室温冲击断裂韧性和钢的拉伸性能。通过光学显微镜（OM），扫描电子显微镜（SEM）和透射电子显微镜（TEM）分析所得的微结构。提取复制技术用于研究热处理过程中形成的复杂沉淀的表征。所得结果表明，锻造后的热处理后，锻造试样的粗晶粒组织得到了明显的细化。复杂沉淀的存在对细化奥氏体晶粒的形成具有有利的影响，因此对最终的显微组织也具有细化作用。热锻有利于提高微合金铸钢的冲击断裂韧性和拉伸性能。经过920℃处理，然后进行空气冷却，锻造试样的冲击能从19.3 J显着提高到208.3 J，并进一步提高了拉伸性能。微合金铸钢在热锻和锻后热处理后提高的冲击断裂韧性和拉伸性能与精炼和均质的铁素体-珠光体组织密切相关。

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