P91热轧无缝钢管的TMCP模拟

doi:10.11901/1005.3093.2019.258

材料研究学报

2019, Vol. 33

Issue (12): 909-917 DOI: 10.11901/1005.3093.2019.258

研究论文

本期目录 | 过刊浏览

P91热轧无缝钢管的TMCP模拟

王晓东^1,²,郭锋¹(

),包喜荣³,王宝峰³

1. 内蒙古工业大学材料科学与工程学院呼和浩特 010051
2. 内蒙古科技大学矿业与煤炭学院包头 014010
3. 内蒙古科技大学材料与冶金学院包头 014010

TMCP Simulation for Hot Rolling of P91 Seamless Steel Pipe

Xiaodong WANG^1,²,Feng GUO¹(

),Xirong BAO³,Baofeng WANG³

1. School of Materials Science & Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
2. School of Mining & Coal, Inner Mongolia University of Science & Technology, Baotou 014010, China
3. School of Material & Metallurgy, Inner Mongolia University of Science & Technology, Baotou 014010, China

引用本文:

王晓东,郭锋,包喜荣,王宝峰. P91热轧无缝钢管的TMCP模拟[J]. 材料研究学报, 2019, 33(12): 909-917.
Xiaodong WANG, Feng GUO, Xirong BAO, Baofeng WANG. TMCP Simulation for Hot Rolling of P91 Seamless Steel Pipe[J]. Chinese Journal of Materials Research, 2019, 33(12): 909-917.

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摘要:

基于无缝钢管PQF工艺并结合其动态相变规律研究结果，制定P91热轧无缝钢管TMCP，使用Gleeble1500-D热模拟试验机对P91钢进行TMCP穿孔、连轧及定径热变形模拟，使用SEM和TEM观察变形各阶段的精细组织结构，分析P91钢管在TMCP条件下的微观组织遗传规律，研究了形变奥氏体的细化、强化及其马氏体相变行为。结果表明：对于P91钢管，采用TMCP，穿孔及连轧真应变达1.8的高温大变形易实现再结晶、细化形变奥氏体晶粒，990℃低温定径变形累积强化形变奥氏体、诱导马氏体相变，结合1℃/s的控制冷却得到了细化至0.1~0.5 μm的马氏体板条。还发现，板条内的亚结构为2~20 nm的微细孪晶及高密度位错，析出了20 nm×100 nm的(Cr,Fe,Mo)₂₃C₆纳米级碳化物。这种组织特征遗传了P91钢管TMCP细晶强化、析出强化及相变强化效果，大大提高了P91钢管的力学性能，并由实际生产验证了P91钢管TMCP的可行性。

关键词 ：金属材料, 热机械控制工艺, 实验模拟, P91, 形变, 相变

Abstract：

The thermal mechanical control processing (TMCP) for hot-rolling of P91 seamless steel pipe was designed based on the features of PQF process and the relevant research results of its dynamic phase transition regularities. Then the hot deformation processes for piercing, continuous rolling and sizing of P91 pipe were simulated by means of Gleeble-1500D thermal-mechanical simulator. Whilst the microstructural evolution of P91 pipe during TMCP was assessed by SEM and TEM, and the refinement and strengthening of deformed austenite and its martensitic transformation behavior were also investigated. The results show that the large deformation at higher temperature with true strain of 1.8 during piercing and continuous rolling may benefit the recrystallization and the refinement of deformed austenite grains, while the accumulation of sizing deformation at 990℃ may strengthen the deformed austenite and induce the martensitic transformation during the TMCP of P91 pipe. Martensite laths with a thickness of 0.1~0.5 μm were obtained via proper controlled cooling of 1℃/s. Fine twins of 2~20 nm and high density dislocations were found in Martensite laths. The nanoscale precipitates of (Cr,Fe,Mo)₂₃C₆ with a size of about 20 nm×100 nm were found between the laths of the martensite. This structure characteristic is the imprint of the TMCP effect of fine grain strengthening, precipitation strengthening and phasetransformation strengthening, which can greatly improve the mechanical properties of P91 pipe. The feasibility of TMCP for P91 pipe was verified by the actual production.

Key words： metallic materials TMCP experimental simulation P91 deformation phase transition

收稿日期: 2019-05-20

ZTFLH:

TG335.71

基金资助:国家自然科学基金(51461034);内蒙古自治区自然科学基金(2014MS0532);内蒙古科技大学创新基金(2014QDL036)

作者简介: 王晓东，男，1978年生，博士，副教授

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https://www.cjmr.org/CN/10.11901/1005.3093.2019.258 或 https://www.cjmr.org/CN/Y2019/V33/I12/909

表1 P91的化学成分表(质量分数，%)

表2 P91钢管TMCP穿孔＋PQF连轧+定径模拟工艺参数

图1 P91钢在不同变形条件下的热膨胀曲线(冷速均为1℃/s )

图2 P91钢在不同变形、冷却条件下的SEM组织

图3 P91钢TMCP热模拟穿孔、连轧和定径的真应力-真应变曲线

图4 P91钢TMCP热模拟穿孔、连轧和定径后的微观组织

图5 P91钢TMCP定径后控制冷却的SEM组织

图6 P91钢TMCP定径后控制冷速为1℃/s的亚结构和析出物

图7 Thermo-Calc计算 P91钢的碳化物析出曲线和M23C6成分变化曲线

表3 P91钢中M23C6碳化物中各元素的原子分数

图8 P91钢管的TMCP成品管及其微观组织

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