B+M/A复相组织X80大变形管线钢的预应变脆化
Embrittlement of a B+M/A Dual Phase X80 Pipeline Steel with Large Deformation during Pre-strain
摘 要
采用热模拟试验机对X80管线钢进行了在线加热配分(HOP)处理, 随后对HOP处理后的管线钢(HOP钢)进行了不同应变量下的预拉伸变形, 研究了预拉伸应变量对该钢显微组织和力学性能的影响, 分析了其预应变脆化现象。结果表明: HOP钢的显微组织由贝氏体+马氏体/奥氏体(B+M/A)组成, 当预应变量为4%时, 贝氏体形成了明显的胞状亚结构且较大预应变量下的胞状亚结构数量较多、尺寸较小; 随着预应变量的增加, HOP钢的拉伸强度和硬度基本呈增大的变化趋势,而塑性呈减小的变化趋势, 该钢发生了明显的脆化。
X80管线钢
预应变
脆化
(B+M/A) dual phase
X80 pipeline steel
pre-strain
embrittlement
Abstract
The heating on-line partitioning (HOP) treatment was conducted on the X80 pipeline steel by a thermal simulator, and then the HOP treated pipeline steel (HOP steel) was pre-stretching deformed at the different stains. The effects of the pre-stretching strain on the microstructure and mechanical properties of the steel were investigated and the pre-strain embrittlement phenomenon was analyzed. The results show that the microstructure of the HOP steel was composed of bainite and martensite/austenite (B+M/A). The obvious cellular substructure of the bainite was formed at the pre-strain of 4%, and the amount of the cellular substructures was relatively large and the size was relatively small at a relatively high pre-stain. With the increase of pre-strain, the tensile strength and hardness of the HOP steel showed an increasing trend while the plasticity and impact energy a decreasing trend, indicating an obvious embrittlement of the steel.
中图分类号 TG142.1 DOI 10.11973/jxgccl201612007
所属栏目 试验研究
基金项目 国家自然科学基金资助项目(51174165); 西安航空职业技术学院2016~2017自选教科研项目(16XHKY017)
收稿日期 2016/3/31
修改稿日期 2016/10/24
网络出版日期
作者单位点击查看
备注马晶(1990-), 女, 陕西渭南人, 助教, 硕士。
引用该论文: MA Jing,ZHANG Xiao-yong,GAO Hui-lin. Embrittlement of a B+M/A Dual Phase X80 Pipeline Steel with Large Deformation during Pre-strain[J]. Materials for mechancial engineering, 2016, 40(12): 26～31
马晶,张骁勇,高惠临. B+M/A复相组织X80大变形管线钢的预应变脆化[J]. 机械工程材料, 2016, 40(12): 26～31
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【3】SHINMIYA T, ISHIKAWA N, OKATSU M, et al. Development of high deformability linepipe with resistance to strain-aged hardening by heat treatment on-line process［C］// The Seventeenth International Offshore and Polar Engineering Conference. Lisbon, Portugal: International Society of Offshore and Polar Engineers, 2007:3121-3126.
【4】THOMAS G A, SPEER J G, MATLOCK D K. Quenched and partitioned microstructures produced via Gleeble simulations of hot-strip mill cooling practices［J］. Metallurgical and Materials Transactions A, 2011, 42(12): 3652-3659.
【5】曾明, 胡水平, 赵征志,等. 工艺参数对X100管线钢中M-A岛和力学性能的影响［J］. 机械工程材料, 2011, 35(12):29-31.
【6】吴海凤, 郑磊.预应变量和时效温度对X80管线钢性能的影响［J］.材料热处理技术, 2009, 38(10): 166-169.
【7】冯耀荣, 高惠临, 霍春勇, 等.管线钢显微组织的分析与鉴别［M］. 西安:陕西科学技术出版社, 2008: 25-32.
【8】黄启今, 刘国权. 通用软件Microsoft Word 在显微组织定量分析中的应用［J］.中国体视学与图像分析, 2002, 7(3): 182-184.
【9】NOBUHISA S, SHIGERU E, MASSKI Y. Effects of a strain hardening exponent on inelastic local buckling strength and mechanical properties of linepipe［C］//The 20th International Conference on Offshore Mechanics and Arctic Engineering. Rio de Janeiro, Brazil: OMAE, 2001:1-8.
【10】彭涛, 程时遐, 吉玲康, 等. X100管线钢在预应变中的脆化［J］.管道技术与设备, 2014(1): 1-3.
【11】仝珂, 庄传晶, 刘强, 等. 高钢级管线钢中M/A岛的微观特征及其对力学性能的影响［J］.机械工程材料, 2011, 35(2): 4-10.
【12】KORZEKWA D A, MATLOCK D K, KRAUSS G. Dislocation substructure as a function of strain in a dual-phase steel［J］. Metallurgical Transactions A, 1984, 15(6): 1221-1228.
【13】刘东雨, 方鸿生, 白秉哲, 等. 无碳化物贝氏体/马氏体复相钢的强韧性［J］.机械工程学报, 2003,39(8):27-31.
【14】COSHAM A, HAGIWARA N, FAKUDA N, et al. A model to predict the effect of pre-strain on the fracture toughness of the line pipe steel［C］//Proceedings of the 4th International Pipeline Conference. Calgary, Canada: American Society of Mechanical Engineers, 2002: 1965-1978.
【15】DE MOOR E, LACROIX S, CLARKE A J, et al. Effect of retained austenite stabilized via quench and partitioning on the strain hardening of martensitic steels［J］. Metallurgical and Materials Transactions A, 2008, 39(11): 2586-2595.
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