不同冷速下钛微合金化Q345B钢的HAZ组织及性能
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摘要
焊接热影响区(HAZ)的微观组织很大程度上决定了钢材焊接处的力学性能。为了掌握含钛微合金钢Q345B在不同焊接线能量下热影响区的微观组织及性能演变规律,采用Gleeble 3500热模拟试验机,对含钛微合金钢Q345B焊接过程中热影响区的组织演变进行模拟试验研究,分析了冷却速率对热影响区的微观组织及冲击韧性的影响。结果表明,大线能量焊接低冷速下热影响区组织以粒状贝氏体为主,t8/5为120s时,析出针状铁素体,针状铁素体的出现有利于焊接热影响区冲击韧性的提升。
The microstructure of heat affected zone(HAZ)has a great effect on the mechanical properties of steel welding.In order to study the evolution of the microstructure and properties of titanium micro-alloyed steel Q345 B in heat affected zone under different welding line energy,an experimental study on the microstructure evolution of Ti-containing micro-alloyed steel Q345 Bin heat affected zone during welding process was carried out with a Gleeble3500 thermal simulator.The effects of cooling rate on the microstructure and impact toughness of heat affected zone were also analyzed.The results revealed that the microstructure of heat affected zone mainly consisted granular bainite.When t8/5 was 120 s,the impact toughness in heat affected zone was improved with the occurrence of acicular ferrite.
The microstructure of heat affected zone(HAZ)has a great effect on the mechanical properties of steel welding.In order to study the evolution of the microstructure and properties of titanium micro-alloyed steel Q345 B in heat affected zone under different welding line energy,an experimental study on the microstructure evolution of Ti-containing micro-alloyed steel Q345 Bin heat affected zone during welding process was carried out with a Gleeble3500 thermal simulator.The effects of cooling rate on the microstructure and impact toughness of heat affected zone were also analyzed.The results revealed that the microstructure of heat affected zone mainly consisted granular bainite.When t8/5 was 120 s,the impact toughness in heat affected zone was improved with the occurrence of acicular ferrite.
引文
[1]张希旺.微合金钢Q345的CCT曲线及断裂韧性研究[D].长沙:中南大学,2008.
[2]东涛,付俊岩.试论我国钢的微合金化发展方向[J].中国冶金,2002,12(5):16.
[3]李亚江.低合金钢焊接及工程应用[M].北京:化学工业出版社,2003.
[4]张文钱.焊接物理冶金[M].天津:天津大学出版社,1989.
[5]赵琳,张旭东,陈武柱.800 MPa级低合金钢焊接热影响区韧性的研究[J].金属学报,2005,41(4):392.
[6]缪成亮,尚成嘉,王学敏,等.高Nb X80管线钢焊接热影响区显微组织与韧性[J].金属学报,2010,46(5):541.
[7]张清清,章传国,郑磊.t8/5时间对X80管线钢热影响区组织和韧性的影响[J].中国冶金,2017,27(4):26.
[8]李亚江,蒋庆磊,暴一品,等.焊接热输入对Q690高强钢热影响区组织和韧性的影响[J].中国科技论文在线,2011,6(2):98.
[9]王超,娄号南,王丙兴,等.合金元素对大线能量焊接用钢组织性能的影响[J].钢铁,2018,53(6):85.
[10]刘政,魏金山,崔冰,等.热输入对960 MPa级高强钢粗晶区组织及性能的影响[J].钢铁,2016,51(2):72.
[11]杨占兵,王森,王福明,等.冷却速度对含Ti非调质钢中晶内铁素体形成的影响[J].金属热处理,2008(6):24.
[12]陈茂爱,唐逸民,楼松年.Ti对低合金高强度钢焊接粗晶热影响区组织及韧性的影响[J].特殊钢,2001(5):5.
[13]柴锋.低合金高强度船体钢焊接热影响区韧化机理研究[D].上海:上海交通大学,2008.
[14]余圣甫,杨可,雷毅,等.大热输入焊接高强度低合金钢热影响区的晶粒细化[J].焊接学报,2008(3):17.
[2]东涛,付俊岩.试论我国钢的微合金化发展方向[J].中国冶金,2002,12(5):16.
[3]李亚江.低合金钢焊接及工程应用[M].北京:化学工业出版社,2003.
[4]张文钱.焊接物理冶金[M].天津:天津大学出版社,1989.
[5]赵琳,张旭东,陈武柱.800 MPa级低合金钢焊接热影响区韧性的研究[J].金属学报,2005,41(4):392.
[6]缪成亮,尚成嘉,王学敏,等.高Nb X80管线钢焊接热影响区显微组织与韧性[J].金属学报,2010,46(5):541.
[7]张清清,章传国,郑磊.t8/5时间对X80管线钢热影响区组织和韧性的影响[J].中国冶金,2017,27(4):26.
[8]李亚江,蒋庆磊,暴一品,等.焊接热输入对Q690高强钢热影响区组织和韧性的影响[J].中国科技论文在线,2011,6(2):98.
[9]王超,娄号南,王丙兴,等.合金元素对大线能量焊接用钢组织性能的影响[J].钢铁,2018,53(6):85.
[10]刘政,魏金山,崔冰,等.热输入对960 MPa级高强钢粗晶区组织及性能的影响[J].钢铁,2016,51(2):72.
[11]杨占兵,王森,王福明,等.冷却速度对含Ti非调质钢中晶内铁素体形成的影响[J].金属热处理,2008(6):24.
[12]陈茂爱,唐逸民,楼松年.Ti对低合金高强度钢焊接粗晶热影响区组织及韧性的影响[J].特殊钢,2001(5):5.
[13]柴锋.低合金高强度船体钢焊接热影响区韧化机理研究[D].上海:上海交通大学,2008.
[14]余圣甫,杨可,雷毅,等.大热输入焊接高强度低合金钢热影响区的晶粒细化[J].焊接学报,2008(3):17.