初始组织对SCM435钢调质处理后力学性能的影响
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摘要
通过对SCM435热轧盘条进行"拉拔-退火-精拉"处理,得到了组织为球状珠光体的样品,对热轧态样品和退火态样品进行同样工艺调质处理后,对其进行了硬度、冲击性能、显微组织及冲击断口分析,另外,还对比了热轧态样品和退火态样品的奥氏体晶粒度。结果表明,两种初始组织状态的样品经调质处理后,均得到回火索氏体组织,相比于退火态样品,组织为贝氏体+铁素体+珠光体的热轧态样品经调质处理后出现明显的颗粒状碳化物,且具有更高的硬度和低温冲击吸收能量,冲击断口仅微观局部区域表现为解理断裂。严重不均匀的奥氏体晶粒,是退火态样品低温冲击吸收能量和硬度偏低的原因,回火索氏体中细小颗粒状和片状形态的碳化物是进一步降低低温冲击吸收能量的另一重要原因。
The spherical pearlite microstructure of SCM435 steel was obtained by the process of "drawing-annealing-final drawing". The hardness, impact properties, microstructure, and impact fracture of the SCM435 steel after quenching and tempering treatment were analyzed. Moreover, the austenite grain size of hot rolled and annealed samples was also compared. The results show that the microstructure of the two samples with different initial microstructure after quenching and tempering treatment is tempered sorbite structure. Compared with the annealed samples, the hot-rolled sample with bainite+ferrite+pearlite microstructure has obvious granular carbides after quenching and tempering, and has higher hardness and low temperature impact absorbed energy, and its impact fracture surface is cleavage fracture only in the micro-local region. The reason for the low impact absorbed energy and hardness of the annealed sample after quenching and tempering treatment is the severe inhomogeneous austenite grain size, and fine granular and plate carbides in annealed sorbite are another reason for the low impact absorbed energy of the annealed sample after quenching and tempering treatment.
The spherical pearlite microstructure of SCM435 steel was obtained by the process of "drawing-annealing-final drawing". The hardness, impact properties, microstructure, and impact fracture of the SCM435 steel after quenching and tempering treatment were analyzed. Moreover, the austenite grain size of hot rolled and annealed samples was also compared. The results show that the microstructure of the two samples with different initial microstructure after quenching and tempering treatment is tempered sorbite structure. Compared with the annealed samples, the hot-rolled sample with bainite+ferrite+pearlite microstructure has obvious granular carbides after quenching and tempering, and has higher hardness and low temperature impact absorbed energy, and its impact fracture surface is cleavage fracture only in the micro-local region. The reason for the low impact absorbed energy and hardness of the annealed sample after quenching and tempering treatment is the severe inhomogeneous austenite grain size, and fine granular and plate carbides in annealed sorbite are another reason for the low impact absorbed energy of the annealed sample after quenching and tempering treatment.
引文
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[16] 朱兴元,刘忆.金属学与热处理[M].北京:中国林业出版社,北京大学出版社,2006.
[2] 丁建生,肖峰,肖杰.35CrMoA钢风电高强螺栓热处理工艺研究[J].热加工工艺,2012,41(12):189-191.DING Jian-sheng,XIAO Feng,XIAO Jie.Heat treatment trocess of 35CrMoA steel high-strength bolt in win d power[J].Hot Working Technology,2012,41(12):189-191.
[3] 阮士朋,王利军,陈继林,等.控轧控冷工艺对SCM435钢盘条组织和性能的影响[J].特殊钢,2016,37(5):45-47.RUAN Shi-peng,WANG Li-jun,CHEN Ji-lin,et al.Effect of control-rolling-cooling process on structure and properties of steel SCM435 rod coil[J].Special Steel,2016,37(5):45-47.
[4] 南鹏飞,王福明,刘振民,等.SCM435冷镦钢的球化退火工艺[J].金属热处理,2016,41(11):92-97.NAN Peng-fei,WANG Fu-ming,LIU Zhen-min,et al.Spheroidizing annealing of SCM435 cold heading steel[J].Heat Treatment of Metals,2016,41(11):92-97.
[5] Ji C,Wang L,Zhu M Y.Effect of subcritical annealing temperature on microstructure and mechanical properties of SCM435 steel[J].Journal of Iron and Steel Research,International,2015,22(11):1031-1036.
[6] 王利军,陈继林,翟进坡,等.初始组织形态对中碳及中碳合金钢退火组织演变的影响[J].金属热处理,2016,41(11):30-34.WANG Li-jun,CHEN Ji-lin,ZHAI Jin-po,et al.Effect of initial microstructure on microstructure evolution of medium carbon and medium carbon alloy steels during annealing[J].Heat Treatment of Metals,2016,41(11):30-34.
[7] 邓素怀,王远方,张慧峰,等.GCr15轴承钢热轧态组织形态对最终热处理后碳化物的影响[J].金属热处理,2014,39(5):40-43.DENG Su-huai,WANG Yuan-fang,ZHANG Hui-feng,et al.Effect of hot rolled microstructural morphology on carbides of bearing steel after final heat treatment[J].Heat Treatment of Metals,2014,39(5):40-43.
[8] 黄璐,宁江利,冯运莉,等.不同初始状态中碳钢双向温轧组织的退火稳定性[J].金属热处理,2017,42(1):49-54.HUANG Lu,NING Jiang-li,FENG Yun-li,et al.Annealing stability of bidirectional warm rolled medium carbon steel with different initial microstructure[J].Heat Treatment of Metals,2017,42(1):49-53.
[9] 陈俊丹,莫文林,王培,等.回火温度对42CrMo钢冲击韧性的影响[J].金属学报,2012,48(10):1186-1193.CHEN Jun-dan,MO Wen-lin,WANG Pei,et al.Effects of tempering temperature on the impact toughness of steel 42CrMo[J].Acta Metallurgica Sinica,2012,48(10):1186-1193.
[10] 徐钢新,陈亮,李勃,等.多次调质对42CrMo钢组织和力学性能的影响[J].金属热处理,2014,39(5):112-114.XU Gang-xin,CHEN Liang,LI Bo,et al.Influence of repeated quenching and tempering on microstructureand mechanical properties of 42CrMo steel[J].Heat Treatment of Metals,2014,39(5):112-114.
[11] 王文昌,蔡宁,鹿宪宝,等.热处理工艺对700L钢冲击韧性的影响[J].材料热处理学报,2017,38(2):129-135.WANG Wen-chang,CAI Ning,LU Xian-bao,et al.Effect of heat treatment process on impact toughness of 700L steel[J].Transactions of Materials and Heat Treatment,2017,38(2):129-135.
[12] 王立民,彭梦都,刘正东,等.热处理工艺对45CrMoV 钢组织和冲击韧性的影响[J].材料热处理学报,2015,36(2):166-169.WANG Li-min,PENG Meng-du,LIU Zheng-dong,et al.Effects of heat treatment on microstructure and impact toughness of 45CrMoV steel[J].Transactions of Materials and Heat Treatment,2015,36(2):166-169.
[13] 张强,靳翠平,鲍雪君,等.回火温度对新型R5系泊链钢显微组织和力学性能的影响[J].机械工程材料,2015,39(2):8-13.ZHANG Qiang,JIN Cui-ping,BAO Xue-jun,et al.Effects if tempering temperature onmicrostructure and mechanical properties of a new type of R5 mooring chain steel[J].Materials for Mechanical Engineering,2015,39(2):8-13.
[14] 麻庆申,张苏渊,刘春明,等.轧态组织对高强钢调质处理后性能的影响[J].金属热处理,2015,40(1):39-41.MA Qing-shen,ZHANG Su-yuan,LIU Chun-ming,et al.Influence of rolling microstructure on properties of high strength steel after quenching and tempering treatment[J].Heat Treatment of Metals,2015,40(1):39-41.
[15] 陈继林,刘振民,刘超,等.轧制工艺对高强度螺栓钢低温冲击性能的影响[J].金属热处理,2017,42(1):94-98.CHEN Ji-lin,LIU Zhen-min,LIU Chao,et al.Effect of rolling process on low temperature impact properties of high strength bolt steel[J].Heat Treatment of Metals,2017,42(1):94-98.
[16] 朱兴元,刘忆.金属学与热处理[M].北京:中国林业出版社,北京大学出版社,2006.
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