Role of tempering cooling rate on impact toughness of 2CrMoV weld metal

Role of tempering cooling rate on impact toughness of 2CrMoV weld metal
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回火冷却速率对2CrMoV焊缝金属冲击韧性的影响

DOI:
10.1557/jmr.2020.59
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发表时间:
2020-03
影响因子:
2.7
通讯作者:
Lu Fenggui
Lu Fenggui
中科院分区:
材料科学4区
文献类型:
--
作者:
Fang Tao;Liu Xia;Shao Chendong;Cui Haichao;Lu Fenggui

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回火冷却速度对2CrMoV焊缝金属的冲击韧性有重要影响。进行了三种不同回火冷却速度的试验,发现随着冷却速度从5 °C/h增加到40 °C/h,焊缝金属的冲击韧性从44.61 J提高到117.49 J。微观结构表征表明,在5 °C/h的冷却速率下,大块M-A组分和团簇析出被认为是应力集中源和解理断裂起始点。在20 °C/h的冷却速率下,块状M-A组分的减少以及析出相的均匀分布导致了从解理到界面脱粘的转变。晶内铁素体基体中裂纹扩展的机会增加,需要吸收更多的能量并提高冲击韧性。当回火冷却速度达到40 °C/h时,裂纹主要在铁素体基体中扩展,同时细小均匀分布的析出相极大地抑制了裂纹扩展,提高了冲击韧性。
Tempering cooling rate plays a significant role in the impact toughness of 2CrMoV weld metal. Three different tempering cooling rate experiments were carried out; it is found that the impact toughness of weld metal improved from 44.61 to 117.49 J as the cooling rate increased from 5 to 40 °C/h. Microstructure characterization revealed that the large blocky M–A constituents and cluster precipitation were considered to act as stress concentration sources and cleavage fracture initiators at a cooling rate of 5 °C/h. Under the cooling rate of 20 °C/h, the decrease of blocky M–A constituents as well as homogeneous distribution of precipitation induced the transition from cleavage to interfacial decohesion. The chance of crack propagation in intragranular ferrite matrix was increased, which needed to absorb more energy and improve impact toughness. When the tempering cooling rate reached at 40 °C/h, the cracks mainly propagated in the ferrite matrix; meanwhile, fine and homogeneous distribution of precipitation greatly inhibited crack propagation and led to higher impact toughness.
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