淬火温度对7Ni钢低温力学性能的影响

doi:10.11901/1005.3093.2017.193

材料研究学报

2018, Vol. 32

Issue (5): 388-394 DOI: 10.11901/1005.3093.2017.193

研究论文

本期目录 | 过刊浏览

淬火温度对7Ni钢低温力学性能的影响

曹宏玮^1,², 罗兴宏²(

), 刘实²

1 中国科学技术大学材料科学与工程学院沈阳 110016
2 中国科学院核用材料与安全评价重点实验室中国科学院金属研究所沈阳 110016

Effect of Quenching Temperature on Cryogenic Mechanical Properties of a 7Ni Steel

Hongwei CAO^1,², Xinghong LUO²(

), Shi LIU²

1 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
2 CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences,Shenyang 110016, China

引用本文:

曹宏玮, 罗兴宏, 刘实. 淬火温度对7Ni钢低温力学性能的影响[J]. 材料研究学报, 2018, 32(5): 388-394.
Hongwei CAO, Xinghong LUO, Shi LIU. Effect of Quenching Temperature on Cryogenic Mechanical Properties of a 7Ni Steel[J]. Chinese Journal of Materials Research, 2018, 32(5): 388-394.

全文: PDF(4788 KB) HTML

摘要:

使用OM、SEM、TEM和XRD等手段观察并表征在不同温度淬火的7Ni钢的组织形貌和逆转奥氏体含量的变化,研究了淬火温度对7Ni钢的低温强度和低温韧性的影响。结果表明：当淬火温度从830℃提高到930℃时钢的低温韧性急剧下降,低温抗拉强度和屈服强度明显降低。同时,随着淬火温度的提高延伸率下降,与低温强度的变化趋势基本一致。在830℃淬火的试验钢,原奥氏体晶粒和马氏体板条束最为细小。而当淬火温度超过830℃时钢中的原奥氏体晶粒和马氏体板条束都显著长大,钢的低温强度和低温韧性随着晶粒尺寸与板条束宽度的增大而下降,粗化的组织对钢的低温强度与低温韧性都有不利的影响。随着淬火温度的提高钢中的逆转奥氏体含量基本上呈下降趋势,在830℃淬火的试验钢中逆转奥氏体含量最高,其低温冲击功也最高。

关键词 ：金属材料, 7Ni钢, 淬火温度, 低温力学性能, 微观组织, 逆转奥氏体

Abstract：

The effect of quenching temperature on cryogenic strength and toughness of a 7Ni steel was investigated. The microstructure and volume fraction of reversed austenite were characterized by means of OM, SEM, TEM, XRD. Results show that cryogenic toughness of the steel sharply decreased when quenching temperature increased from 830℃ to 930℃. And cryogenic tensile strength as well as yield strength were obviously decreased with increasing quenching temperature. What's more, elongation also decreased at higher quenching temperature, and has a consistent variation tendency with cryogenic strength. Grains of prior austenite and martensite packets were fine in the steel quenched at 830℃, but grains and packets grew significantly at higher quenching temperature. Cryogenic strength and toughness decreased with growth of grain sizes and packet width. Coarsen microstructure has a adverse effect on cryogenic strength and toughness. The amount of reversed austenite showed downtrend basically by increasing quenching temperature. The steel quenched at 830℃ has a maximum of reversed austenite amount and impact energy.

Key words： metallic materials 7Ni steel quenching temperature cryogenic mechanical properties microstructure reversed austenite

收稿日期: 2017-03-17

作者简介:

作者简介曹宏玮,男,1989年生,博士生

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表1 试验钢的化学成分

图1 淬火温度对试验钢低温拉伸性能的影响

图2 淬火温度对试验钢低温韧性的影响

图3 淬火温度不同的试验钢的低温冲击断口形貌

图4 淬火温度不同的试验钢的原奥氏体晶粒

图5 淬火温度不同的试验钢的微观组织

图6 淬火温度对试验钢原奥氏体晶粒尺寸和马氏体板条束宽度的影响

图7 淬火温度对逆转奥氏体含量的影响

图8 淬火温度不同的试验钢的TEM图像及其衍射花样

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