Effect of tempering on microstructure and mechanical properties of 3Mn-Si-Ni martensitic steel

Effect of tempering on microstructure and mechanical properties of 3Mn-Si-Ni martensitic steel
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回火对3Mn-Si-Ni马氏体钢组织和力学性能的影响

DOI:
10.1016/j.msea.2017.11.037
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发表时间:
2018-01
影响因子:
6.4
通讯作者:
Hou Bao yu
Hou Bao yu
中科院分区:
材料科学1区
文献类型:
--
作者:
Zhao Yan jun;Ren Xue ping;Hu Zhi liu;Xiong Zhi ping;Zeng Jian min;Hou Bao yu

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系统分析了3 Mn-Si-Ni马氏体钢的组织和力学性能随回火温度(180 ~ 650 °C)的变化规律。采用扫描和透射电子显微镜对材料的微观结构进行了表征;采用单轴拉伸试验和夏比V型缺口冲击试验对材料的力学性能进行了测试。经不同温度回火后,观察到回复、部分再结晶、碳化物析出和残余奥氏体分解。在230 °C回火后,由于高位错密度和ε-碳化物析出,实现了强度(1550 MPa)和韧性(91.5 J)的优异组合。然而,随着回火温度从320 °C增加到550 °C,观察到回火马氏体脆化,其中冲击能量为~ 10 J。这是由于奥氏体分解生成了铁素体而不是过渡碳化物所致。随着回火温度升高至650 °C,由于强回复和部分再结晶,获得了75 J的高断裂冲击韧性,同时降低了850 MPa的拉伸强度。
The dependence of microstructures and mechanical properties on tempering temperature (from 180 to 650 °C) in a designed 3Mn-Si-Ni martensitic steel was systematically analyzed. Microstructure was characterized using scanning and transmission electron microscopy; mechanical properties were measured using uniaxial tensile test and Charpy V-notch impact test. After tempering at different temperatures, recovery, partial recrystallization, carbides precipitation and decomposition of residual austenite were observed. After tempering at 230 °C, an excellent combination of strength (1550 MPa) and toughness (91.5 J) was achieved, due to high dislocation density and ε-carbides precipitation. However, with an increase in tempering temperature from 320 to 550 °C, tempered martensite embrittlement was observed, where impact energy was ~ 10 J. It was ascribed to cementite formation instead of transition carbides and decomposition of residual austenite. With an increase in tempering temperature up to 650 °C, high fracture impact toughness of 75 J was obtained with deteriorated tensile strength of 850 MPa due to strong recovery and partial recrystallization.
DOI: 10.5860/choice.43-6550
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