S460G1钢特厚板在调质过程中的组织演变与强韧化机制
Microstructures Evolution and Strengthing-Toughening Mechanism of S460G1 Steel Heavy Plate During Quenching and Tempering
摘 要
通过严格控制轧制参数对S460G1钢进行热轧,得到厚度150 mm的特厚板,然后进行870~960 ℃淬火和550~660 ℃回火处理,研究了钢板的组织演变和强钢化机制。结果表明:热轧钢板由表面向心部的组织依次为针状铁素体→粒状贝氏体→铁素体+珠光体;淬火后,表面组织主要为板条马氏体,1/4板厚处以粒状贝氏体为主,1/2板厚处为铁素体和珠光体;其中900,930 ℃淬火后1/4板厚处原奥氏体晶粒细小均匀,晶粒尺寸分布集中,范围分别为4.12~31.88,5.02~32.69μm;热轧钢板经930 ℃淬火与600~630 ℃回火后,其表面组织为回火索氏体,1/4板厚处及1/2板厚处的组织与淬火态类似,但板条铁素体等轴化及铁素体粗化趋势增加,此时钢板的综合力学性能优良,屈强比不高于0.85;马氏体/奥氏体(M/A)岛的分解、析出物的大量析出、位错消失及板条铁素体等轴化等是其具备良好强韧性的主要原因。
淬火
回火
组织演变
M/A岛
S460G1 steel heavy plate
quenching
tempering
microstructure evolution
M/A island
Abstract
150 mm thick S460G1 steel heavy plate was obtained by hot rolling after strictly controlling rolling process, and then quenched at 870—960 ℃ and tempered at 550—660 ℃. The microstructure evolution and strengthing-toughening mechanism of the steel plate were researched. The results show that from the surface to the center of hot rolled steel plate, the microstructure was acicular ferrite→granular bainite→ferrite and pearlite. After quenching, the microstructure on the plate surface was lath martensite, one quarter thickness of the plate was mainly granular bainite and the center of the plate were ferrite and pearlite. After quenching at 900 ℃ and 930 ℃, the original austenite grains at the one quarter thickness of the plate were fine and uniform, and the grain size distribution was concentrated with ranging of 4.12—31.88 μm and 5.02—32.69 μm, respectively. After quenching at 930 ℃ and tempering at 600—630 ℃, the microstructure on the plate surface was tempered sorbite, and the microstructures of one quarter thickness and center of plate were similar to those at quenching state, but the trend of equiaxed lath ferrite and coarsened ferrite was strengthened; at this time the steel plate had excellent comprehensive mechanical properties with the yield ratio of not higher than 0.85. Martensite/austenite(M/A) island decomposing, a large amount of precipitate, dislocation eliminating and equiaxial ferrite deforming were the main reasons for the excellent strength and toughness of the hot rolled steel.
中图分类号 TG156.6 DOI 10.11973/jxgccl202202004
所属栏目 试验研究
基金项目
收稿日期 2020/11/3
修改稿日期 2021/11/29
网络出版日期
作者单位点击查看
备注宋欣(1982-),男,河南信阳人,高级工程师,硕士
引用该论文: SONG Xin,LI Wei,BING Chun,YU Tao,BI Jianwei. Microstructures Evolution and Strengthing-Toughening Mechanism of S460G1 Steel Heavy Plate During Quenching and Tempering[J]. Materials for mechancial engineering, 2022, 46(2): 20～30
宋欣,李伟,邴纯,于涛,毕建伟. S460G1钢特厚板在调质过程中的组织演变与强韧化机制[J]. 机械工程材料, 2022, 46(2): 20～30
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【4】付天亮,庞辉勇,田秀华,等.临氢铬钼特厚钢板研制与应用研究进展[J].轧钢,2020,37(5):50-56.FU T L,PANG H Y,TIAN X H,et al.Development and application of anti-hydrogen chromium molybdenum ultra heavy plate[J].Steel Rolling,2020,37(5):50-56.
【5】于爽,乔松.高形状比轧制工艺改善厚规格钢板内部质量的研究[J].宽厚板,2014,20(4):17-19.YU S,QIAO S.Investigation on internal quality improvement of thick steel plate with high shape ratio rolling process[J].Wide and Heavy Plate,2014,20(4):17-19.
【6】李艳梅,杨梦奇,张舒展,等.高渗透轧制对SA738 Gr.B厚板变形渗透性的影响[J].东北大学学报(自然科学版),2019,40(12):1711-1715.LI Y M,YANG M Q,ZHANG S Z,et al.Effect of high permeability rolling process on deformation permeability of SA738 Gr.B thick plate[J].Journal of Northeastern University (Natural Science),2019,40(12):1711-1715.
【7】赵德文,章顺虎,王根矶,等.厚板热轧中心气孔缺陷压合临界力学条件的证明与应用[J].应用力学学报,2011,28(6):658-662.ZHAO D W,ZHANG S H,WANG G J,et al.Derivation and application of criterion for closing a central void during plate hot rolling[J].Chinese Journal of Applied Mechanics,2011,28(6):658-662.
【8】卢军辉,吴战芳,仇圣桃,等.轧制条件对消除特厚钢板中心偏析和中心疏松的影响[J].科学技术与工程,2020,20(29):11901-11908.LU J H,WU Z F,QIU S T,et al.Effect of rolling condition on the porosity and segregation annihilation of the heavy steel plate[J].Science Technology and Engineering,2020,20(29):11901-11908.
【9】宋欣,杨海峰,王川,等.屈服强度1 100 MPa级超高强钢热处理组织及性能[J].钢铁研究学报,2019,31(6):592-600.SONG X,YANG H F,WANG C,et al.Microstructures and properties of 1 100 MPa grade ultra-high strength steel after heat treatments[J].Journal of Iron and Steel Research,2019,31(6):592-600.
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【12】高志玉,樊献金,窦春岳,等.特厚板厚度方向形变传递规律的仿真分析[J].钢铁,2019,54(4):49-54.GAO Z Y,FAN X J,DOU C Y,et al.Simulation analysis on transfer law of deformation in thickness direction of ultra-heavy plate[J].Iron & Steel,2019,54(4):49-54.
【13】霍文丰,胡贤磊,王丙兴,等.控制冷却中钢板厚度方向上的冷却速度[J].钢铁研究学报,2011,23(11):18-21.HUO W F,HU X L,WANG B X,et al.Cooling rate in thickness direction of plate during controlled cooling[J].Journal of Iron and Steel Research,2011,23(11):18-21.
【14】李钊,吴润,徐乐,等.30CrMoTi钢的组织遗传及晶粒细化[J].金属热处理,2018,43(2):116-121.LI Z,WU R,XU L,et al.Structure heredity and grain refinement of 30CrMoTi steel[J].Heat Treatment of Metals,2018,43(2):116-121.
【15】温玉磊,杨后雷,王菲,等.PCrNi3MoV钢奥氏体晶粒细化工艺[J].金属热处理,2019,44(9):212-215.WEN Y L,YANG H L,WANG F,et al.Austenite grains refining process of PCrNi3MoV steel[J].Heat Treatment of Metals,2019,44(9):212-215.
【16】YUAN X Q,LIU Z Y,JIAO S H,et al.The onset temperatures of γ to α-phase transformation in hot deformed and non-deformed Nb micro-alloyed steels[J].ISIJ International,2006,46(4):579-585.
【17】郑丽丽,彭军,安胜利,等.贝氏体组织钢的研究与应用现状[J].内蒙古科技大学学报,2019,38(4):344-348.ZHENG L L,PENG J,AN S L,et al.Research and application status of Bainite microstructure steel[J].Journal of Inner Mongolia University of Science and Technology,2019,38(4):344-348.
【18】江易林,方金祥,董世运,等.无碳化物贝氏体钢的研究进展[J].热加工工艺,2020,49(22):16-21.JIANG Y L,FANG J X,DONG S Y,et al.Research progress of non-carbide bainite steel[J].Hot Working Technology,2020,49(22):16-21.
【19】赵燕青,孙力,刘宏强,等.贝氏体组织类型对780 MPa级低碳贝氏体钢力学性能的影响[J].热加工工艺,2019,48(20):148-150.ZHAO Y Q,SUN L,LIU H Q,et al.Effect of bainitic microstructure type on mechanical properties of 780 MPa low carbon bainitic steel[J].Hot Working Technology,2019,48(20):148-150.
【20】付天亮,田秀华,韩钧,等.特厚钢板辊式淬火过程厚向温降规律研究[J].哈尔滨工业大学学报,2019,51(11):122-127.FU T L,TIAN X H,HAN J,et al.Thickness temperature drop regularity during roller quenching process for ultra-heavy steel plate[J].Journal of Harbin Institute of Technology,2019,51(11):122-127.
【21】岳重祥,刘东升.回火工艺对高强韧NV-F690厚船板精细组织的影响[J].金属热处理,2012,37(12):6-10.YUE C X,LIU D S.Effect of tempering on fine microstructure of NV-F690 thick steel plate with balanced strength and toughness[J].Heat Treatment of Metals,2012,37(12):6-10.
【22】徐文芳,张朋彦,杨鹏.在线淬火型微合金高强钢的回火组织与性能[J].金属热处理,2020,45(11):187-192.XU W F,ZHANG P Y,YANG P.Tempered microstructure and properties of on-line quenched micro alloyed high strength steel[J].Heat Treatment of Metals,2020,45(11):187-192.
【23】ZHANG J,CAI Q W,WU H B,et al.Effect of tempering temperature on microstructure and properties of E690 offshore plate steel[J].Journal of Iron and Steel Research,International,2012,19(3):67-72.
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