冷轧退火工艺对中碳钢组织性能的影响
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摘要
运用常规冷轧方法对2.0 mm厚的中碳钢进行轧制,并利用模拟机试验机对冷轧试样进行罩式模拟退火试验,再分别采用显微镜、硬度计及电子万能试验机,进一步分析试验用碳钢的组织及力学性能变化。结果表明:退火后试样的铁素体内析出了大量的渗碳体,晶粒尺寸较均匀;随着退火均热时间的延长,显微组织尺寸稍有增加,显微硬度及抗拉强度逐渐下降。在压下量80%、退火温度700℃、保温15 min时,试验用碳钢的硬度值为216 HB,最大抗拉强度550 MPa,具有较好地强韧性组合。
Conventional cold rolling was used to roll medium carbon steel with 2.0 mm thickness. Simulator test machine was applied to simulate annealing of cold rolled samples. Microscope, hardness tester and electronic universal test machine were used to further analyze the changes of microstructure and mechanical properties of carbon steel for test. The results show that a large number of cementite are precipitated from ferrite after annealing, and the grain size is uniform. With the prolongation of annealing soaking time, the microstructures size increases slightly, while the micro-hardness and tensile strength decrease gradually. The hardness value of carbon steel is 216 HB and the maximum tensile strength is 550 MPa with 80% reduction, 700 ℃ annealing temperature and 15 min holding time, which has a good combination of strength and toughness.
Conventional cold rolling was used to roll medium carbon steel with 2.0 mm thickness. Simulator test machine was applied to simulate annealing of cold rolled samples. Microscope, hardness tester and electronic universal test machine were used to further analyze the changes of microstructure and mechanical properties of carbon steel for test. The results show that a large number of cementite are precipitated from ferrite after annealing, and the grain size is uniform. With the prolongation of annealing soaking time, the microstructures size increases slightly, while the micro-hardness and tensile strength decrease gradually. The hardness value of carbon steel is 216 HB and the maximum tensile strength is 550 MPa with 80% reduction, 700 ℃ annealing temperature and 15 min holding time, which has a good combination of strength and toughness.
引文
[1]ZHANG X,GODFREY A,HUANG X,et al.Microstructure and strengthening mechanism in cold-drawn pearlitic steel wire[J].Acta Materialia,2011,59(9):3244～3430.
[2]李志杰,彭艳,刘宏民,等.中碳钢温变形的力学特性[J].北京理工大学学报,2013,4(1):38～42.
[3]任秀平.冷轧板快速热处理技术的研究开发[J].世界金属导报,2013,2(19):1～5.
[4]王延薄,齐克敏.金属塑性加工学——轧制理论与工艺[M].北京:冶金工业出版社,2001.
[5]崔忠圻,瘫耀春.金属学与热处理[M].北京:机械工业出版社,2007.
[6]杨丽芳,孙力,杜雁冰,等.冷轧Ti-IF钢再结晶温度测定及罩退工艺研究[J].河北冶金,2015,(12):14～17.
[7]AM ABRAO,B DENKENA,J KOHLER,et al.The influence of heat treatment and deep rolling on the mechanical properties and integrity of AISI 1060 steel[J].Journal of Materials Processing Technology,2014,214(1):3020～3030.
[8]宋维锡.金属学与热处理[M].北京:冶金工业出版社,1980.
[9]解鸽,杜明山,夏明生.超低碳钢罩式退火工艺及成型性研究[J].河北冶金,2015,(7):12～14.
[10]周敏,历勇,刘荣佩,等.新型二次元硬化渗碳钢的高温塑性及热加工图[J].钢铁,2016,51(6):76～81.
[2]李志杰,彭艳,刘宏民,等.中碳钢温变形的力学特性[J].北京理工大学学报,2013,4(1):38～42.
[3]任秀平.冷轧板快速热处理技术的研究开发[J].世界金属导报,2013,2(19):1～5.
[4]王延薄,齐克敏.金属塑性加工学——轧制理论与工艺[M].北京:冶金工业出版社,2001.
[5]崔忠圻,瘫耀春.金属学与热处理[M].北京:机械工业出版社,2007.
[6]杨丽芳,孙力,杜雁冰,等.冷轧Ti-IF钢再结晶温度测定及罩退工艺研究[J].河北冶金,2015,(12):14～17.
[7]AM ABRAO,B DENKENA,J KOHLER,et al.The influence of heat treatment and deep rolling on the mechanical properties and integrity of AISI 1060 steel[J].Journal of Materials Processing Technology,2014,214(1):3020～3030.
[8]宋维锡.金属学与热处理[M].北京:冶金工业出版社,1980.
[9]解鸽,杜明山,夏明生.超低碳钢罩式退火工艺及成型性研究[J].河北冶金,2015,(7):12～14.
[10]周敏,历勇,刘荣佩,等.新型二次元硬化渗碳钢的高温塑性及热加工图[J].钢铁,2016,51(6):76～81.