调质态07MnNiMoDR钢脆性断裂机制及冲击功离散性

doi:10.12068/j.issn.1005-3026.2017.03.010

东北大学学报:自然科学版 ›› 2017, Vol. 38 ›› Issue (3): 350-355.DOI: 10.12068/j.issn.1005-3026.2017.03.010

调质态07MnNiMoDR钢脆性断裂机制及冲击功离散性

石昆¹，侯洪²，李金富¹，张汉谦^{1, 3}

(1. 上海交通大学材料科学与工程学院，上海200240； 2. 东北大学冶金学院，辽宁沈阳110819； 3. 宝山钢铁股份有限公司研究院，上海201900 )

收稿日期:2015-10-21 修回日期:2015-10-21 出版日期:2017-03-15 发布日期:2017-03-24
通讯作者: 石昆
作者简介:石昆(1985-)，男，河南郑州人，上海交通大学博士研究生; 李金富(1964-)，男，山西晋中人，上海交通大学教授，博士生导师; 张汉谦(1964-)，男，山西运城人，上海交通大学教授，博士生导师.
基金资助:
国家自然科学基金资助项目(2011CB610405); 上海宝钢钢铁研究院压力容器发展研究项目(X08ECEJ190).

Brittle Fracture Mechanism and Impact Energy Scattering of Quenched and Tempered 07MnNiMoDR Steel

SHI Kun¹， HOU Hong²， LI Jin-fu¹， ZHANG Han-qian^{1, 3}

1. School of Materials Science and Engineering， Shanghai Jiao Tong University， Shanghai 200240， China; 2. School of Metallurgy， Northeastern University， Shenyang 110819， China; 3. Baosteel Research Institute， Baoshan Iron & Steel Co.， Ltd.， Shanghai201900， China.

Received:2015-10-21 Revised:2015-10-21 Online:2017-03-15 Published:2017-03-24
Contact: ZHANG Han-qian
About author:-
Supported by:
-

摘要/Abstract

摘要： 测试了调质态07MnNiMoDR钢的冲击功，研究了其在DBTT区间的脆性断裂机制.结果表明，调质态07MnNiMoDR钢在DBTT区间的解理断裂由贝氏体束尺寸控制；存在一个临界尺寸，当形成于贝氏体束内的微裂纹尺寸达到这个临界值，并在正应力作用下穿过贝氏体束界扩展至相邻贝氏体束时，发生脆性解理断裂.另外，在DBTT区间的冲击断裂过程中，粗大贝氏体束的离散分布将使得脆性断裂载荷值不稳定，并最终导致冲击功出现离散.因此，通过控制调质态07MnNiMoDR钢中贝氏体束尺寸并使其均匀分布，能够有效提高其在DBTT区间的冲击功及降低冲击功离散性.

关键词: 贝氏体束, 冲击功, 解理断裂, 断裂机制, 离散性

Abstract: The impact energy of quenched and tempered (Q&T) 07MnNiMoDR steel was measured. The brittle fracture micro-mechanism in the ductile-brittle transition temperature (DBTT) region was studied. The results showed that the brittle fracture behavior is controlled by bainitic packets size. A critical packet size exists. When a micro-crack formed in the bainitic packet with a size exceeding the critical size propagates into adjacent packets under normal stress， brittle cleavage fracture occurs. The discrete distribution of the coarse bainitic packets leads to the scatter of brittle fracture load， which results in the impact energy scattering. It is suggested that homogenizing the distribution of fine bainitic packet sizes is an effective method of improving the impact energy and reducing its scattering in the DBTT region.

Key words: bainitic packet, impact energy, cleavage fracture, fracture mechanism, scattering

中图分类号:

TG142.1

石昆，侯洪，李金富，张汉谦. 调质态07MnNiMoDR钢脆性断裂机制及冲击功离散性[J]. 东北大学学报:自然科学版, 2017, 38(3): 350-355.

SHI Kun， HOU Hong， LI Jin-fu， ZHANG Han-qian. Brittle Fracture Mechanism and Impact Energy Scattering of Quenched and Tempered 07MnNiMoDR Steel[J]. Journal of Northeastern University Natural Science, 2017, 38(3): 350-355.

参考文献

[1]Kang J S，Seol J B，Park C G.Three-dimensional characterization of bainitic microstructures in low-carbon high-strength low-alloy steel studied by electron backscatter diffraction［J］.Materials Characterization，2013，79(3):110-121.
[2]孙明雪，王猛，衣海龙，等.回火温度对低碳贝氏体高强度钢组织性能的影响［J］.东北大学学报(自然科学版)，2013，34(12):1725-1729.(Sun Ming-xue，Wang Meng，Yi Hai-long，et al.Effects of tempering temperatures on microstructure and properties of low carbon high strength bainitic steels［J］.Journal of Northeastern University(Natural Science)，2013，34(12):1725-1729.)
[3]Samal M K，Chakravartty J K，Seidenfuss M，et al.Evaluation of fracture toughness and its scatter in the DBTT region of different types of pressure steels［J］.Engineering Failure Analysis，2011，18(1):172-185.
[4]Zhang X Z，Knott J F.The statistical modelling of brittle fracture in homogeneous and heterogeneous steel microstructures［J］.Acta Materialia，2000，48(9):2135-2146.
[5]Beremin F M，Pineau A，Mudry F.A local criterion for cleavage fracture of a nuclear pressure vessel steel［J］.Metallurgical and Materials Transactions:A，1983，14 (11): 2277-2287.
[6]Bowen P，Druce S G，Knott J F.Micromechanical modeling of fracture toughness［J］. Acta Metallurgica，1987，35(7):1735-1746.
[7]Chen J H，Cao R.Micromechanism of cleavage fracture of metals［M］.London:Elsevier，2014.
[8]Lan H F，Du L X，Liu X H.Microstructure and mechanical properties of a low carbon bainitic steels［J］.Steel Research International，2013，84(4):352-361.
[9]Cao R，Zhang X B，Wang Z， et al.Investigation of microstructural features determining the toughness of 980MPa bainitic weld metal［J］. Metallurgical and Materials Transactions:A，2014，45 (2):815-834.
[10]段争涛，李艳梅，朱伏先，等.不同工艺低碳Nb-B贝氏体钢组织性能［J］.东北大学学报(自然科学版)，2012，33(6):823-826.(Duan Zheng-tao，Li Yan-mei，Zhu Fu-xian，et al.Microstructures and mechanical properties of low carbon Nb-B bainitic steel with different processing［J］.Journal of Northeastern University(Natural Science)，2012，33(6):823-826.)
[11]Chen J H，Wang G Z，Yan C，et al.Advances in the mechanism of cleavage fracture of low ally steel at low temperature.PartⅠ:critical event［J］.International Journal of Fracture，1997，83(2):105-120.
[12]Ray A，Sivaprasad S，Chakrabarti D.A critical grain size concept to predict the impact transition temperature of Ti-microalloyed steels［J］.International Journal of Fracture，2012，173(2):215-222.
[13]Wang G Z，Chen J H，Wang J G.On the characteristic distance and minimum fracture toughness for cleavage fracture in a C-Mn steel［J］.International Journal of Fracture，2002，118(1):57-76.
[14]Rancel L，Gómez M，Medina S F，et al.Measurement of bainite packet size and its influence on cleavage fracture in a medium carbon bainitic steel［J］. Materials Science Engineering:A，2011，530(1):21-27.
[15]Shi K，Hou H，Chen J B，et al.Effect of bainitic packet size distribution on impact toughness and its scattering in the ductile-brittle transition temperature region of Q&T Mn-Ni-Mo bainitic steels［J］.Steel Research International，2016，87(2):165-172.

调质态07MnNiMoDR钢脆性断裂机制及冲击功离散性

Brittle Fracture Mechanism and Impact Energy Scattering of Quenched and Tempered 07MnNiMoDR Steel

RichHTML

PDF (PC)

可视化

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 9

编辑推荐

Metrics

本文评价

[1]	盛忠起，宋百隆，魏世丞，王玉江. 冲击功对8Mn-2Cr-Si钢磨粒磨损性能的影响[J]. 东北大学学报:自然科学版, 2018, 39(2): 211-215.
[2]	王述红，张紫杉，王存根，张峰春. 岩体结构面产状随机分布空间表征[J]. 东北大学学报:自然科学版, 2017, 38(1): 121-125.
[3]	徐明舟;王立军;王建军;刘春明;. 18%Cr-12%Mn-0.55%N高氮奥氏体不锈钢低温性能与组织稳定性[J]. 东北大学学报(自然科学版), 2010, 31(1): 47-50+55.
[4]	臧尔寿;王文新. 碳素重轨钢中磷的偏聚行为[J]. 东北大学学报:自然科学版, 1991, 12(4): 366-371.
[5]	-. W—200型潜孔冲击器的设计与试验[J]. 东北大学学报:自然科学版, 1976, -(4): 44-52.
[6]	-. 单齿凿入破碎岩石试验[J]. 东北大学学报:自然科学版, 1975, -(2): 25-41.
[7]	沈阳风动工具厂东北工学院测试组. “7655”型凿岩机内部动力过程的测试[J]. 东北大学学报:自然科学版, 1975, -(1): 31-40.
[8]	-. 冲击器测试方法初步总结[J]. 东北大学学报:自然科学版, 1973, -(0): 23-48.
[9]	邢贵成;孟祥振. 岩石夯捣坚固性测定的讨论[J]. 东北大学学报:自然科学版, 1964, -(1): 112-121.