卷取温度对大变形(B+M/A)X80管线钢组织和性能的影响*

doi:10.11901/1005.3093.2014.291

材料研究学报

2015, Vol. 29

Issue (3): 185-194 DOI: 10.11901/1005.3093.2014.291

本期目录 | 过刊浏览

卷取温度对大变形(B+M/A)X80管线钢组织和性能的影响*

马晶(

),张骁勇,程时遐,高惠临

西安石油大学材料科学与工程学院西安 710065

Effect of Coiling Temperature on Microstructure and Mechanical Properties of (B+M/A) X80 Pipeline Steel with Excellent Deformability

Jing MA(

),Xiaoyong ZHANG,Shixia CHENG,Huilin GAO

School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China

引用本文:

马晶,张骁勇,程时遐,高惠临. 卷取温度对大变形(B+M/A)X80管线钢组织和性能的影响*[J]. 材料研究学报, 2015, 29(3): 185-194.
Jing MA, Xiaoyong ZHANG, Shixia CHENG, Huilin GAO. Effect of Coiling Temperature on Microstructure and Mechanical Properties of (B+M/A) X80 Pipeline Steel with Excellent Deformability[J]. Chinese Journal of Materials Research, 2015, 29(3): 185-194.

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摘要:

通过卷取连续HOP(heating on-line partitioning)技术, 使X80管线钢获取了(B+M/A)复相组织和大变形性能。采用力学性能测试、显微分析和X射线衍射方法研究了在不同卷取温度条件下(B+M/A)X80管线钢的组织演变规律, 分析了显微组织对其力学性能的影响。结果表明, 随着卷取温度的升高, 贝氏体的含量和位错密度减小, 残余奥氏体含量增加, 导致材料强度降低和塑性增加。在高的卷取温度条件下, 碳化物的析出和残余奥氏体的分解是材料强度增加和塑性减小的显微组织因素。在一定卷取温度下, 实验钢有低的屈强比、高的均匀伸长率和和高的形变强化指数, 符合大变形管线钢的技术要求。

关键词 ：金属材料, (B+M/A)X80大变形管线钢, 卷取连续配分, 卷取温度, 组织性能

Abstract：

High deformability X80 pipeline steel with microstructure composed of bainite and martinsite/austenite (B+M/A) can be obtained through the coiling continuous partitioning process. Effect of coiling temperature on the microstructure evolution and mechanical performance of the (B+M/A) X80 pipeline steel was studied by means of microscopic analysis, X-ray diffraction and mechanical property tests. The results show that with the increasing coiling temperature, the strength of the steel decreases and the ductility increases because of the decrease amount of bainite and dislocation density, as well as the increase amount of retained austenite. By a high coiling temperature, both of the precipitation of carbides and the decomposition of retained austenites result in the increase of strength and the decrease of plasticity. With a process by proper coiling temperature, the produced steel with such (B+M/A) dual-phase structure may exhibit a comprehensive mechanical performance with such as lower ratio of yield to strength, higher uniform elongation and strain hardening index, which meets the technical requirements of high deformability pipeline steel.

Key words： metallic materials (B+M/A) X80 pipeline steel with excellent deformability the coiling continuous partitioning process coiling temperature microstructure and properties

收稿日期: 2014-06-17

基金资助:* 国家自然科学基金51174165, 陕西省重点学科专项资金YS37020203和陕西省自然科学基金2014JM6232资助项目。

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https://www.cjmr.org/CN/10.11901/1005.3093.2014.291 或 https://www.cjmr.org/CN/Y2015/V29/I3/185

图1 卷取连续HOP工艺示意图

表1 X80实验钢的化学成分

图2 不同卷取温度下X80的应力-应变曲线

图3 X80实验钢的强塑性与卷取温度的关系

表2 实验钢在不同卷取温度下的屈强比、均匀伸长率和形变强化指数

图4 不同卷取温度下X80实验钢的冲击韧性

图5 不同卷取温度下X80实验钢组织的SEM像

图6 X80碳化物的析出

表3 不同卷取温度下贝氏体的体积分数

图7 典型卷取温度下的贝氏体的TEM像

图8 典型卷取温度下的贝氏体的高倍TEM像

图9 卷取温度470℃下碳化物的析出

图10 典型卷取温度下的M/A形态

图11 卷取温度为440℃时M/A组元的明场、暗场像及电子衍射谱

图12 不同卷取温度下M/A含量

图13 卷取温度为380℃时残余奥氏体的明场、暗场像及电子衍射谱

图14 卷取温度为440℃时残余奥氏体的明场、暗场像及电子衍射谱

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