900 MPa级热轧TRIP钢的性能特征和析出行为

doi:10.11901/1005.3093.2017.326

材料研究学报

2018, Vol. 32

Issue (9): 662-668 DOI: 10.11901/1005.3093.2017.326

本期目录 | 过刊浏览

900 MPa级热轧TRIP钢的性能特征和析出行为

高绪涛^1,³(

), 赵爱民², 张元³

1 北京交通大学机械与电子控制工程学院北京 100044
2 北京科技大学钢铁共性技术协同创新中心北京 100083
3 北京市地铁运营有限公司地铁运营技术研发中心北京 102208

Mechanical Property and Precipitation of 900 MPa Grade Hot-rolled TRIP Steel

Xutao GAO^1,³(

), Aimin ZHAO², Yuan ZHANG³

1 College of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China
2 Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China
3 Subway Operation Technology Center, Beijing Mass Transit Railway Operation Corporation Ltd, Beijing 102208, China

引用本文:

高绪涛, 赵爱民, 张元. 900 MPa级热轧TRIP钢的性能特征和析出行为[J]. 材料研究学报, 2018, 32(9): 662-668.
Xutao GAO, Aimin ZHAO, Yuan ZHANG. Mechanical Property and Precipitation of 900 MPa Grade Hot-rolled TRIP Steel[J]. Chinese Journal of Materials Research, 2018, 32(9): 662-668.

全文: PDF(4997 KB) HTML

摘要:

采用X射线衍射(XRD)、透射电镜(TEM)和拉伸实验等方法,研究了两种常规卷取温度对热轧C-Si-Mn-Nb-V-N钢组织性能及析出行为的影响。结果表明,卷取温度为450℃时试验钢析出物颗粒尺寸要小于卷取温度为400℃时试验钢中的析出物颗粒尺寸,但是数量多于卷取温度为400℃时析出物的数量。在两种卷取温度条件下制备的试验钢中铁素体的平均晶粒尺寸均小于5 μm,残余奥氏体数量相差不大,但是在450℃卷取温度下通过细晶与析出强化可制备出抗拉强度900 MPa级、强塑积27000 MPa∙%的热轧TRIP钢,其综合性能力学优于400℃卷取温度下制备的热轧TRIP钢。

关键词 ：金属材料, TRIP钢, 热轧, 析出, 组织性能

Abstract：

The precipitation behavior and mechanical property of hot-rolled TRIP steel C-Si-Mn-Nb-V-N coiled at two different temperatures were investigated by means of XRD, TEM and tensile test. Results show that the size of precipitates is smaller, while the quantity of the precipitates is larger for the steel coiled at 450℃ rather than at 400℃. The average grain size of ferrite grains of the steel coiled at the two temperatures is all less than 5 μm, but the difference in quantities of retained austenite grains is small. The tensile strength and strength-ductility product of the steel coiled at 450℃ are 900 MPa and 27000 MPa∙% respectively, which may be ascribed to both of the fine grain strengthening and precipitation strengthening. Therefore, the steel coiled at 450℃ presents better comprehensive mechanical property than that coiled at 400℃.

Key words： metallic materials TRIP steel hot rolling precipitation structure property

收稿日期: 2017-06-14

ZTFLH:

TG142

作者简介:

作者简介高绪涛,男,1976年生,高级工程师

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https://www.cjmr.org/CN/10.11901/1005.3093.2017.326 或 https://www.cjmr.org/CN/Y2018/V32/I9/662

图1 试验钢轧后冷却工艺的示意图

图2 试验钢的组织扫描照片

图3 不同卷取温度下试验钢铁素体的晶粒尺寸分布

图4 不同卷取温度下试验钢的光学显微组织

图5 不同卷取温度下试验钢的残余奥氏体体积分数

图6 不同卷取温度下的试验钢析出物TEM照片

图7 不同卷取温度下的试验钢析出物TEM照片和成分

图8 不同卷取温度下试验钢析出物的尺寸分布图

图9 不同卷取温度下试验钢的力学性能

图10 (Nb,V)(C,N)在铁素体位错线沉淀析出理论计算的NrT曲线

图11 (Nb,V)(C,N)在铁素体位错线沉淀析出理论计算的PTT曲线

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