The variation of heat treatments including directed quenching and tempering off-line after controlled rolling (DQT) and quenching off-line and tempering off-line after controlled rolling (RQT) with microstructure and mechanical properties of a low-carbon microalloyed steel was compared and analyzed. For DQT, the quenched steel was obviously banded microstructure, with increasing tempering temperature, lath martensite coarsened, the cusp carbide precipitated at grain boundaries, the yield strength fluctuated slightly, and the fracture-separation was obvious.The impact toughness was better in the steel tempered at 500 ℃ for 1 h. In RQT, with increasing tempering temperature, lath martensite degenerated, intragranular and intergranular finer precipitations with smaller than 30 nm precipitated and grew up and were distributed dispersedly, the stripe-like carbides were distributed at grain boundaries,and the yield strength and tensile strengthen decreased obviously. The impact toughness of RQT process was much better than that of DQT process, and the comprehensive mechanical properties were better for the steel tempered at 500 ℃ for 1 h of RQT process.
参考文献
| [1] | Yi Ren,Shuai Zhang,Shuang Wang,Wen-yue Liu.Experimental study on 830 MPa grade pipeline steel containing chromium[J].矿物冶金与材料学报,2009(03):273-277. |
| [2] | Okaguchi S;Makino H;Hamada M.Development and Mechanical Properties of X120 Linepipe[A].Honolulu:ISOPE,2003:36. |
| [3] | Shanmugam S;Ramisetti NK;Misra RDK;Hartmann J;Jansto SG .Microstructure and high strength-toughness combination of a new 700 MPa Nb-microalloyed pipeline steel[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2008(1/2):26-37. |
| [4] | B. Beidokhti;A. H. Koukabi;A. Dolati .Effect of titanium addition on the microstructure and inclusion formation in submerged arc welded HSLA pipeline steel[J].Journal of Materials Processing Technology,2009(8):4027-4035. |
| [5] | Lee Sunghak;Kwon Dongil;Lee Young Kook et al.Transformation Strengthening by Thermomechanical Treatments in C-Mn-Ni-Nb Steels[J].Metallurgical and Materials Transactions,1995,26A:1093. |
| [6] | BYOUNGCHUL HWANG;SUNGHAK LEE;YOUNG MIN-KIM .Correlation of Rolling Condition, Microstructure, and Low-Temperature Toughness of X70 Pipeline Steels[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,2005(7):1793-1805. |
| [7] | 武会宾,尚成嘉,杨善武,侯华兴,马玉璞,于功利.超细化低碳贝氏体钢的回火组织及力学性能[J].金属学报,2004(11):1143-1150. |
| [8] | H. Asahi;T. Hara;M. Sugiyama;N. Maruyama;Y. Terada;H. Tamehiro;K. Koyama;S. Ohkita;H. Morimoto;K. Tomioka;N. Doi;M. Murata;N. Ayukawa;H. Akasaki;D. P. Fairchild;M. L. Macia;C. W. Petersen;J. Y. Koo;N. V. Bangaru;M. J. Luton .Development of Plate and Seam Welding Technology for X120 Linepipe[J].International journal of offshore and polar engineering,2004(1):11-17. |
| [9] | S.K. DHUA;D. MUKERJEE;D.S. SARMA .Influence of Thermomechanical Treatments on the Microstructure and Mechanical Properties of HSLA-100 Steel Plates[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,2003(2):241-253. |
| [10] | 刘东雨,徐鸿,杨昆,白秉哲,方鸿生.贝体/马氏体复相组织对低碳合金钢强韧性的影响[J].金属学报,2004(08):882-886. |
| [11] | WENG Yu-qing.Ultrafine Grained Steel[M].北京:冶金工业出版社,2003 |
| [12] | 陈林恒,康永林,黎先浩,温德智,刘国民.回火温度对600MPa级低碳贝氏体钢组织和力学性能的影响[J].北京科技大学学报,2009(08):983-987. |
| [13] | 彭正全.提高低碳微合金化中板延伸率的轧制工艺措施[J].机械研究与应用,2007(06):51-52. |
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