曲轴用非调质钢C38N2带状组织消除工艺的研究
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摘要
针对曲轴用非调质钢C38N2轧制过程中出现的带状组织,采用高温扩散退火和控制冷却速率等热处理工艺研究消除带状组织的效果。结果表明:试样在1230℃保温120 min随炉冷却时,带状组织基本消除,呈现均匀的铁素体和珠光体组织,但试样表面氧化严重,且存在脱碳现象。试样在1230℃保温1 min,并从1050℃到500℃以0.2~0.5℃/s冷却然后空冷至室温,不存在带状组织;以0.5~2℃/s冷却时,随着冷却速度增大,带状组织变得严重;而以2~5℃/s冷却时,带状组织又逐渐消失,但组织内出现贝氏体和马氏体组织。
Aiming at banded microstructure of non-quenched and tempered C38N2 steel for crankshaft in rolling process,the effect of eliminating banded microstructure was researched by using heat treatment processes of high temperature diffusion annealing and controlled cooling rate. The results show that when the temperature of the sample is at 1230 ℃ for 120 min and cooling in furnace, the band microstructure is basically eliminated, and the microstructure of the ferrite and pearlite is presented, but the surface oxidation is serious and there is decarbonization phenomenon. There is no banded microstructure in samples at 1230 ℃ for 1min, cooling from 1050 ℃ to 500 ℃ with 0.2-0.5℃/s and then air cooled to room temperature. When cooling rate is in 0.5-2 ℃/s, with the increase of the cooling rate, the banded microstructure became serious; when the cooling rate is in 2-5 ℃/s, the banded microstructure gradually disappears, but the bainite and martensite in microstructure appear.
Aiming at banded microstructure of non-quenched and tempered C38N2 steel for crankshaft in rolling process,the effect of eliminating banded microstructure was researched by using heat treatment processes of high temperature diffusion annealing and controlled cooling rate. The results show that when the temperature of the sample is at 1230 ℃ for 120 min and cooling in furnace, the band microstructure is basically eliminated, and the microstructure of the ferrite and pearlite is presented, but the surface oxidation is serious and there is decarbonization phenomenon. There is no banded microstructure in samples at 1230 ℃ for 1min, cooling from 1050 ℃ to 500 ℃ with 0.2-0.5℃/s and then air cooled to room temperature. When cooling rate is in 0.5-2 ℃/s, with the increase of the cooling rate, the banded microstructure became serious; when the cooling rate is in 2-5 ℃/s, the banded microstructure gradually disappears, but the bainite and martensite in microstructure appear.
引文
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[2]Zhou Leyu,Jiang Bo,Li Mingyang,et al.Microstructur e control of non-quenched and tempered CT80 grade coiled tubing steel[J].Acta Metallurgica Sinica(English Letters),2014,27(3):464-468.
[3]刘栋林,谭利,杨红新,等.铁素体-珠光体型非调质钢中的微合金化及锻造工艺[J].钢铁研究学报,2013,25(12):41-46.
[4]蒋泓清,黄先亮,黄志兵.非调质钢的性能影响因素与发展现状[J].金属世界,2013(5):37-40.
[5]刘云旭.低碳合金钢中带状组织的成因,危害和消除[J].金属热处理,2000(12):1-3.
[6]Offerman S E,Van Dijk N H,Rekveldt M T,et al.Ferrite/pearlite band formation in hot rolled medium carbon steel[J].Materials Science and Technology,2002,18(3):297-303.
[7]蔡珍,黄运华,张跃,等.冷却速度对铁素体-珠光体带状组织的影响机制[J].钢铁研究学报,2012,24(6):25-30.
[8]于洪彪.钢材带状组织的产生原因及消除方法[J].科技传播,2014(9):149.
[9]孙进,张利平,郑桂芸,等.22Cr Mo H齿轮钢带状组织成因及预防措施[J].莱钢科技,2005(3):10-11.
[10]刘宗昌.珠光体转变与退火[M].北京:化学工业出版社,2007.
[11]刘宗昌,王玉峰,杨慧,等.42Cr Mo钢锻轧材的带状组织[J].包头钢铁学院学报,2003,22(4):323-326.
[12]沈黎晨,林大为.消除16Mn钢板带状组织的临界冷却速度研究[J].上海金属,1999,21(6):25-28.
[13]田亚强,宋进英,魏英立,等.控轧控冷工艺对J55石油套管用钢带状组织影响[J].塑性工程学报,2011,18(6):110-114.