微量钛对C-Si-Mn-B钢组织和性能的影响  

Effect of Trace Titanium on Microstructure and Properties of C-Si-Mn-B Steel

作　　者：方圆[1] 张宏艳[1] 崔阳[1] 阳代军[1] 赵运堂[1] 

机构地区：[1]首钢技术研究院,北京100043

出　　处：《物理测试》2013年第6期5-7,共3页Physics Examination and Testing

摘　　要：针对微量Ti对C-Si-Mn-B系低合金高强度钢组织性能的影响规律问题,采用拉伸、冲击和弯曲试验机、光学显微镜以及透射电镜对试验钢进行分析。结果表明,含钛钢和无钛钢性能均满足S355J0标准要求,无钛钢组织为铁素体+珠光体,钢中析出物为50～100nm多依附在MnS颗粒上析出的BN粒子;含钛钢组织为铁素体+珠光体+粒状贝氏体,析出物主要为50～150nm的TiN粒子。且微量钛的加入可显著抑制C-Si-Mn-B钢中BN的析出,使得固溶硼元素的含量增加,并通过在钢的相转变过程中促进贝氏体形成以及组织细化,达到提高强度的效果。Effect of trace Titanium on microstructure and properties of C-Si-Mn-B low alloy high strength steel were studied by using tensile, impact and flexural testing machines, optical microscopy and transmission electron micros copy. The properties of Titanium-containing steel and Titanium-free steel can meet the requirements of $355J0 standard. The microstructure of Titanium-free steel is composed of ferrite and pearlite, and the precipitates attached to MnS particles is BN particles, which is about 50--100 nm. The microstructure of Titanium-containing steel is composed of ferrite, pearlite and bainitie, and the precipitates is TiN particles which is about 50--150 nm. Trace Titanium added can significantly inhibit the precipitation of BN in the C-Si-Mn-B steel, so the content of the solid solution Boron element is in- creased. It can promote bainite formation in the phase transformation process and refine the microstructure, thus improving the strength.

关 键 词：组织 性能 硼 钛 析出 

分 类 号：TG142.1[一般工业技术—材料科学与工程]