马氏体板条控制单元对20CrNi2Mo钢韧性的影响

doi:10.11901/1005.3093.2017.301

材料研究学报

2018, Vol. 32

Issue (4): 290-300 DOI: 10.11901/1005.3093.2017.301

研究论文

本期目录 | 过刊浏览

马氏体板条控制单元对20CrNi2Mo钢韧性的影响

卢叶茂^1,^2,^3,⁴, 梁益龙^1,^2,^3,⁴(

), 龙绍檑^1,^2,^3,⁴, 尹存宏^2,^3,⁴, 杨明^1,^2,^3,⁴

1 贵州大学材料与冶金学院贵阳 550025
2 贵州省材料结构与强度重点实验室贵阳 550025
3 贵州省高性能金属结构材料与制造技术工程实验室贵阳 550025
4 高性能金属结构材料与制造技术国家地方联合工程实验室贵阳 550025

Effect of the Martensite Lath on Toughness of 20CrNi2Mo Steel

Yemao LU^1,^2,^3,⁴, Yilong LIANG^1,^2,^3,⁴(

), Shaolei LONG^1,^2,^3,⁴, Cunhong YIN^2,^3,⁴, Ming YANG^1,^2,^3,⁴

1 College of Materials and Metallurgy, University of Guizhou, Guiyang 550025, China
2 Key Laboratory for Material Structure and Strength of Guizhou Province, Guiyang 550025, China
3 Guizhou Key Laboratory of High Performance Metal Structure and Manufacture Technology, Guiyang 550025,China
4 National Local Co-construction Engineering Laboratory for High Performance Metal Structure Material and Manufacture Technology, Guiyang 550025, China

引用本文:

卢叶茂, 梁益龙, 龙绍檑, 尹存宏, 杨明. 马氏体板条控制单元对20CrNi2Mo钢韧性的影响[J]. 材料研究学报, 2018, 32(4): 290-300.
Yemao LU, Yilong LIANG, Shaolei LONG, Cunhong YIN, Ming YANG. Effect of the Martensite Lath on Toughness of 20CrNi2Mo Steel[J]. Chinese Journal of Materials Research, 2018, 32(4): 290-300.

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摘要:

测试了不同淬火温度下20CrNi2Mo低碳钢的冲击韧性和断裂韧性,并使用OM、SEM、EBSD、TEM定量分析了试验钢的多层次组织。结果表明,在1200℃淬火处理的试样具有较好的韧性,断裂韧性和冲击韧性的最大增幅分别为43.58%和27.78%。同时,随着淬火温度的提高试验钢原奥氏体晶粒(d_r)、马氏体束(d_p)、马氏体块(d_b)增大,而马氏体板条(d_l)略微减小。根据裂纹扩展路径和韧窝尺寸分析并结合Hall-Petch关系,证明了马氏体板条是韧性的有效控制单元。同时,根据EBSD应力分析揭示了裂纹扩展的塑性变形能,并计算了断裂韧性和冲击韧性在裂纹扩展过程中的能量关系。

关键词 ：金属材料, 板条马氏体钢, 控制单元, 冲击韧性, 断裂韧性, 形变能

Abstract：

The impact toughness and fracture toughness were studied for 20CrNi2Mo steel quenching at different temperatures and the hierarchical microstructures obtained were investigated by OM, SEM, EBSD and TEM. Results showed that materials quenching at 1200℃ had best toughness in which the fracture toughness and impact absorption energy increased 43.58% and 27.78%, respectively. The size of prior austenite grain (d_r), packet (d_p) and block (d_b) was increased with the increase of quenching temperature, while the martensite lath (d_l) was decreased slightly with the coarsen of prior austenite grain. It was proved that the effective control unit of toughness for the tested steel was martensite lathes by crack propagation path analyzing and the statistic of dimple size combined with the Hall-Petch formula. In addition, the difference of plastic deformation was declared by EBSD and the relationship between fracture toughness and impact toughness during crack propagation process was calculated.

Key words： metallic materials lath martnesite steel control unit impact toughness fracture toughness deformation energy

收稿日期: 2017-05-09

基金资助:资助项目国家自然科学基金(51461006和51671060)

作者简介:

作者简介卢叶茂,男,1992年生,硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2017.301 或 https://www.cjmr.org/CN/Y2018/V32/I4/290

表1 20CrNi2Mo的化学成分(质量分数,%)

图1 20CrNi2Mo钢的热处理工艺图

图2 Charpy U型试样和断裂韧性试样

图3 不同热处理状态下J积分与裂纹扩展量△a的关系

图4 不同淬火温度下的晶粒尺寸与冲击吸收功和断裂韧性的关系

图5 在不同温度淬火的20CrNi2Mo钢的OM、SEM、EBSD、TEM像。

表2 20CrNi2Mo钢不同热处理状态下多层次组织

图6 900℃和1200℃淬火状态下冲击试样裂纹扩展区SEM像

表3 裂纹扩展过程中穿马氏体束的比例

图7 平均韧窝尺寸和淬火温度的关系

图8 20CrNi2Mo钢多层次组织参量和平均韧窝尺寸的关系

图9 20CrNi2Mo钢的韧性与马氏体多层次组织的关系

表4 不同淬火温度下断裂韧度、冲击韧性以及高应变塑性区

图10 不同晶粒尺寸对应的高应变塑性区

表5 900℃和1200℃淬火试样中小角度晶界含量(%)

图11 裂纹附近的小角度晶界分布

图12 断裂韧性试样裂尖应力等高线

图13 高应变塑性区宽度和相对应变量的关系

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