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The dynamic CCT curve of low carbon high niobium steel is determined and drawn as well as the effects of cooling rate on microstructure are studied through static simulating rolling compression test of low carbon high niobium steel with MMS-200 thermomechanical simulator. The results showed that the microstructure was mainly composed of polygonal ferrite (PF), a little pearlite (P) and small quantity of acicular ferrite (AF) observed when cooling rate was 0.5 ℃/s; the microstructure was mainly composed of acicular ferrite (AF) and pearlite disappeared, but certain proportion of polygonal ferrite (PF) was still visible when cooling rate was 1.0 ℃/s; the transformation structure was completely granular bainite (GB) when cooling rate was increased to 2 ℃/s; the transformation structure was mainly composed of granular bainite (GB) and a small amount of ferrite bainite (FB) when cooling rate was increased to 5 ℃/s; the transformation structure was mainly composed of ferrite bainite (FB) and a small amount of martensite (M) when cooling rate was increased to 30 ℃/s.

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利用MMS-200热力模拟实验机对高强韧钻杆用低碳高铌钢进行模拟轧制压缩试验,测定绘制低碳高铌钢动态连续冷却转变(CCT)曲线,并研究了冷却速率对显微组织的影响。结果表明,冷速为0.5 ℃/s时,组织主要由多边形铁素体(PF)和少量珠光体(P)组成,同时观察到极少量的针状铁素体(AF);冷速为1 ℃/s时,组织以针状铁素体(AF)为主,珠光体消失,但仍可见一定比例的多边形铁素体(PF);冷速升高到2 ℃/s时,转变组织完全为粒状贝氏体(GB);冷速升高到5 ℃/s时,转变组织以粒状贝氏体(GB)为主,同时出现少量的铁素体贝氏体(FB);冷速升高到30 ℃/s时,转变组织以铁素体贝氏体(FB)为主,同时出现少量的马氏体(M)。

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白海瑞(1986-),男,内蒙古土默特左旗人,硕士,高级工程师,现从事宽厚板产品研发工作。

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白海瑞(1986-),男,内蒙古土默特左旗人,硕士,高级工程师,现从事宽厚板产品研发工作。

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白海瑞(1986-),男,内蒙古土默特左旗人,硕士,高级工程师,现从事宽厚板产品研发工作。

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C Si Mn P S Ni Cr Mo Nb Ti Alt
≤0.09 ≤0.20 ≤1.70 ≤0.015 ≤0.008 ≥0.20 ≤0.30 ≤0.30 0.06~0.08 ≤0.03 0.02~0.05
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试验钢化学成分(质量分数) %

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C Si Mn P S Ni Cr Mo Nb Ti Alt
≤0.09 ≤0.20 ≤1.70 ≤0.015 ≤0.008 ≥0.20 ≤0.30 ≤0.30 0.06~0.08 ≤0.03 0.02~0.05
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高强韧钻杆用低碳高铌钢的动态CCT曲线测定与分析
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白海瑞 , 袁晓鸣 , 黄利 , 杨雄
包钢科技 | 品种质量与试验研究 2024,50(1): 47-50
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包钢科技 | 品种质量与试验研究 2024, 50(1): 47-50
高强韧钻杆用低碳高铌钢的动态CCT曲线测定与分析
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白海瑞, 袁晓鸣, 黄利, 杨雄
作者信息
  • 内蒙古包钢钢联股份有限公司技术中心,内蒙古 包头 014010
  • 白海瑞(1986-),男,内蒙古土默特左旗人,硕士,高级工程师,现从事宽厚板产品研发工作。

Determination and Analysis on Dynamic CCT (Continuous Cooling Transformation) Curve of Low Carbon High Niobium Steel for High Strength and Toughness Drill Pipe
Hai-rui Bai, Xiao-ming Yuan, Li Huang, Xiong Yang
Affiliations
  • Technical Center of Inner Mongolia Baotou Steel Union Co., Ltd., Baotou 014010, Inner Mongolia Autonomous Region, China
出版时间: 2024-02-25
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利用MMS-200热力模拟实验机对高强韧钻杆用低碳高铌钢进行模拟轧制压缩试验,测定绘制低碳高铌钢动态连续冷却转变(CCT)曲线,并研究了冷却速率对显微组织的影响。结果表明,冷速为0.5 ℃/s时,组织主要由多边形铁素体(PF)和少量珠光体(P)组成,同时观察到极少量的针状铁素体(AF);冷速为1 ℃/s时,组织以针状铁素体(AF)为主,珠光体消失,但仍可见一定比例的多边形铁素体(PF);冷速升高到2 ℃/s时,转变组织完全为粒状贝氏体(GB);冷速升高到5 ℃/s时,转变组织以粒状贝氏体(GB)为主,同时出现少量的铁素体贝氏体(FB);冷速升高到30 ℃/s时,转变组织以铁素体贝氏体(FB)为主,同时出现少量的马氏体(M)。

钻杆  /  低碳高铌钢  /  动态CCT曲线  /  冷却速率  /  显微组织

The dynamic CCT curve of low carbon high niobium steel is determined and drawn as well as the effects of cooling rate on microstructure are studied through static simulating rolling compression test of low carbon high niobium steel with MMS-200 thermomechanical simulator. The results showed that the microstructure was mainly composed of polygonal ferrite (PF), a little pearlite (P) and small quantity of acicular ferrite (AF) observed when cooling rate was 0.5 ℃/s; the microstructure was mainly composed of acicular ferrite (AF) and pearlite disappeared, but certain proportion of polygonal ferrite (PF) was still visible when cooling rate was 1.0 ℃/s; the transformation structure was completely granular bainite (GB) when cooling rate was increased to 2 ℃/s; the transformation structure was mainly composed of granular bainite (GB) and a small amount of ferrite bainite (FB) when cooling rate was increased to 5 ℃/s; the transformation structure was mainly composed of ferrite bainite (FB) and a small amount of martensite (M) when cooling rate was increased to 30 ℃/s.

drill pipe  /  low carbon high niobium steel  /  dynamic CCT curve  /  cooling rate  /  microstructure
白海瑞, 袁晓鸣, 黄利, 杨雄. 高强韧钻杆用低碳高铌钢的动态CCT曲线测定与分析. 包钢科技, 2024 , 50 (1) : 47 -50 .
Hai-rui Bai, Xiao-ming Yuan, Li Huang, Xiong Yang. Determination and Analysis on Dynamic CCT (Continuous Cooling Transformation) Curve of Low Carbon High Niobium Steel for High Strength and Toughness Drill Pipe[J]. Science & Technology of Baotou Steel, 2024 , 50 (1) : 47 -50 .
低碳高铌钢因其具有高强度、高塑性、良好的冷弯性能以及优异的低温冲击性能广泛应用于管线钢、汽车车轮钢、汽车大梁钢以及工程机械用钢等领域[1]。近年来,随着科学技术的进步,制造业的振兴,以及基建的大力推进,要求大型机械设备原材料国产化,替代进口,实现产品升级换代,急需开发高强韧钻杆用低碳高铌钢。动态CCT曲线可以较好地模拟实际生产条件下的相变规律,对钢的金相组织和力学及工艺性能调控具有指导意义。因此,本文利用MMS-200热力模拟实验机、蔡司光学显微镜等手段,研究了高强韧钻杆用低碳高铌钢的动态连续冷却组织和相变规律,以期为高强韧钻杆用低碳高铌钢的开发提供数据支持。
合适的化学成分设计是高强韧钻杆用低碳高铌钢金相组织和力学及工艺性能的有力保证[2]。高强韧钻杆用钢在实验室真空冶炼,合金体系采用低碳+高铌的设计理念,化学成分见表1
将试验钢加热到1 180 ℃并保温适当时间后进行开坯,坯厚75 mm。在样坯上切取热力模拟试样,圆柱体热压缩试样加工尺寸为Φ8 mm×15 mm。热压缩模拟试验在MMS-200热力模拟实验机上进行,将试样以10 ℃/s的速率加热到1 180 ℃,保温5 min,使试样充分奥氏体化;然后以5 ℃/s的冷速冷至变形温度820 ℃,在该温度下变形30%,变形速率为1 s-1;试样变形后分别以0.5 ℃/s、1 ℃/s、2 ℃/s、5 ℃/s、10 ℃/s、15 ℃/s、20 ℃/s、30 ℃/s、40 ℃/s的冷却速率冷却至室温,采集温度、时间等试验数据,同时记录不同冷速下的试样膨胀量与温度变化的曲线,并采用Axio observer A1M型蔡司显微镜观察不同冷速下的金相组织,绘制动态CCT曲线。动态CCT曲线测定工艺如图1所示。
图2为高强韧钻杆用低碳高铌钢的动态CCT曲线,依据不同冷却时间,冷速从右向左依次为0.5 ℃/s、1 ℃/s、2 ℃/s、5 ℃/s、10 ℃/s、15 ℃/s、20 ℃/s、30 ℃/s、40 ℃/s。
图2可知,连续冷却过程中高强韧钻杆用低碳高铌钢发生了奥氏体(A)向铁素体(F)、珠光体(P)、贝氏体(B)以及马氏体(M)的转变。冷速为0.5 ℃/s时,组织主要由多边形铁素体(PF)和少量珠光体(P)组成;冷速为1.0 ℃/s时,组织以针状铁素体(AF)为主,珠光体消失;冷速升高到2 ℃/s时,转变组织完全为粒状贝氏体(GB);冷速升高到5 ℃/s时,转变组织以粒状贝氏体(GB)为主,同时出现少量的铁素体贝氏体(FB);冷速升高到30 ℃/s时,转变组织以铁素体贝氏体(FB)为主,同时出现少量的马氏体(M)。
高强韧钻杆用低碳高铌钢经单道次变形后不同冷速下的试样再经粗磨、细磨、机械抛光后采用浓度为4%的硝酸酒精溶液侵蚀,然后利用蔡司Axio observer A1M显微镜观察显微组织并分析其特征,不同冷却速率下高强韧钻杆用低碳高铌钢的显微组织如图3所示。从图3可知,当冷速为0.5 ℃/s时,室温组织主要由多边形铁素体(PF)和少量珠光体(P)组成,同时可观察到极少量的针状铁素体(AF),这是由于缓慢冷却(冷速较低)致使铁素体(F)和珠光体(P)形成[3]。当冷速增加到1.0 ℃/s,室温组织以针状铁素体(AF)为主,同时珠光体消失,这是由于冷速增加抑制珠光体(P)扩散型相变所致,同时冷速的增加促使针状铁素体(AF)的形成,抑制多边形铁素体(PF)长大。冷速达到2 ℃/s时,冷速进一步增加,相变产物全部为粒状贝氏体(GB)。当冷速升高到5 ℃/s时,相变组织以粒状贝氏体(GB)为主,同时开始出现少量的铁素体贝氏体(FB)。冷速在5~30 ℃/s之间时,室温组织均为贝氏体,随着冷速的增加铁素体贝氏体(FB)占比增加,粒状贝氏体(GB)占比减少。当冷却速率为30 ℃/s时,开始出现马氏体(M),转变组织仍以铁素体贝氏体(FB)为主。可见高强韧钻杆用低碳高铌钢经单道次变形后不同冷速下获得的室温金相组织和动态CCT曲线中不同冷速的相变规律相同。
(1)用MMS-200热力模拟实验机,结合金相法测定了高强韧钻杆用低碳高铌钢的动态CCT曲线。
(2)当冷速为0.5 ℃/s时,试验钢组织主要由多边形铁素体(PF)和少量珠光体(P)组成;冷速为1.0 ℃/s时,试验钢组织以针状铁素体(AF)为主,珠光体消失;冷速升高到2 ℃/s时,转变组织完全为粒状贝氏体(GB);冷速升高到5 ℃/s时,转变组织以粒状贝氏体(GB)为主;冷速升高到30 ℃/s时,转变组织以铁素体贝氏体(FB)为主,同时出现少量的马氏体(M)。
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付俊岩. Nb微合金化和含铌钢的发展及技术进步[J]. 钢铁, 2005, 40(8):1-7.
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齐俊杰, 黄运华, 张跃. 微合金化钢[M]. 北京: 冶金工业出版社, 2006.
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  • 接收时间:2023-10-11
  • 首发时间:2025-10-23
  • 出版时间:2024-02-25
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2种不同金属材料的力学参数

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Genus
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Number of
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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