增氮对钒微合金化钢连续冷却相变行为的影响

doi:10.11901/1005.3093.2014.265

材料研究学报

2015, Vol. 29

Issue (2): 120-126 DOI: 10.11901/1005.3093.2014.265

本期目录 | 过刊浏览

增氮对钒微合金化钢连续冷却相变行为的影响

马江南(

),杨才福,王瑞珍

钢铁研究总院工程用钢所北京 100081

Effect of Nitrogen Addition on Continuous Cooling Transformation Behavior of Vanadium Microalloyed Steels

Jiangnan MA(

),Caifu YANG,Ruizhen WANG

Department of Engineering Steels, Central Iron and Steel Research Institute, Beijing 100081, China

引用本文:

马江南,杨才福,王瑞珍. 增氮对钒微合金化钢连续冷却相变行为的影响[J]. 材料研究学报, 2015, 29(2): 120-126.
Jiangnan MA, Caifu YANG, Ruizhen WANG. Effect of Nitrogen Addition on Continuous Cooling Transformation Behavior of Vanadium Microalloyed Steels[J]. Chinese Journal of Materials Research, 2015, 29(2): 120-126.

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摘要:

用热膨胀仪测定了3种不同钒、氮含量试验钢的CCT曲线, 观察了在不同冷速下的组织, 分析了钒的析出行为, 计算了各形核基底与铁素体的晶格平面点阵错配度, 研究了增氮对钒微合金化钢连续冷却相变行为的影响。结果表明, 增氮促进了铁素体的形成, 提高了试验钢的相变开始温度, 也提高了形成全贝氏体组织的临界冷却速率; 在冷速0.8-1.6℃/s范围内, 低氮钢的显微组织为粒状贝氏体+板条贝氏体, 而在增氮钢内则有大量的针状铁素体; 在低氮钢中钒主要在相变前后析出, 析出物以VC为主, 增加钒含量只能提高其析出量, 不能改变析出温度和析出物的成分; 而增氮后钒在奥氏体内析出, 以VN为主; 在900℃, 奥氏体、VC和VN与铁素体的平面点阵错配度分别为6.72%、3.89%和1.55%, VN与铁素体存在近似共格的低能界面, 能作为铁素体优先形核位置, 有效促进铁素体形成。

关键词 ：金属材料, 钒微合金化, 连续冷却相变, 增氮, 平面错配度, 晶内铁素体形核

Abstract：

Effect of nitrogen addition on continuous cooling transformation behavior of vanadium microalloyed steels was investigated. Therefor, CCT curves of three experimental steels with different vanadium and nitrogen content were measured by thermal dilatometer; the microstructural evolution of the steels with the varying cooling rates was characterized; their precipitation behavior was tracked, and planer lattice misfit degree of the precipitates with the ferrite matrix was calculated. The results show that ferrite transformation is promoted by nitrogen addition, and the starting temperature of transformation and the critical cooling rate for full bainite transformation are increased as well. For cooling rates in a range 0.8-1.6℃/s, the microstructure of steels with low nitrogen consists of granular bainite + lath like bainite, while acicular ferrite also exists; during or after the γ-α transformation vanadium compounds in low nitrogen steels precipitate mainly as VC, the quantity of which increases with the increasing vanadium content. However, for the steel rich in nitrogen, vanadium compounds precipitate as VN in austenite at high temperature. The lattice misfit degree of ferrite with the precipitates of austenite, VC and VN, which occurred at 900℃are 6.72%, 3.89% and 1.55% respectively. It indicates that VN precipitates act as preferential nucleation sites for ferrites and promote the ferrite transformation.

Key words： metallic materials vanadium microalloying continuous cooling transformation nitrogen addition planar lattice misfit degree intragranular ferrite nucleation

收稿日期: 2014-05-27

基金资助:* 工信部高技术船舶科研项目-基于IMO标准的船用耐蚀钢应用技术研究资助。

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https://www.cjmr.org/CN/10.11901/1005.3093.2014.265 或 https://www.cjmr.org/CN/Y2015/V29/I2/120

表1 试验钢化学成分

图1 试验钢VH、VM和NH的CCT曲线

表2 试验钢临界相变温度

图2 平衡态不同温度下各相的含量

表3 试验钢不同冷速下的相变开始温度Ts

图3 试验钢在不同冷速下的组织

图4 试验钢V(C, N)析出中的C, N占位分数

图5 晶体学位向关系示意图

表4 铁素体形核基底相晶体学数据

图6 在不同冷速下试验钢的维氏硬度

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