Q500q钢的连续冷却转变行为及生产试制
|
摘要
利用热模拟实验机Gleeble-2000,对Q500q钢连续冷却转变行为以及在650～300℃温度区间的相变行为进行了研究及生产试制.结果表明:当冷速为1～4℃/s时,试验钢的微观组织由铁素体和珠光体组成.当冷速增至4～16℃/s时,发生贝氏体相变;随着冷却速度的增加,贝氏体组织更为细化且体积分数增加.当冷却速度大于4℃/s后,试验钢在650～300℃冷却速度减半时,贝氏体相变的终了温度升高,贝氏体相变区间缩小,与连续冷却转变相比组织差距不大.采用两种不同的冷却方式生产试制后,两组试验钢的力学性能和金相显微组织一致,说明650℃以下可以采用缓冷坑堆冷的方式来提高钢板的探伤合格率.
Using Gleeble 2000 thermo-mechanical simulator,the phase transformation behavior of Q500 bridge steels was studied after cooling with constant and cooling with variable rate 650 ～ 300 ℃,and a trial production of Q500 q was also carried out. Results showed that: the final microstructure is ferrite and pearlite when the cooling rate is 1 ～4 ℃/s,and bainite transformation occurred when the cooling rate increased from 4 ℃/s to 16 ℃/s. The microstructure is refined and the volume fraction of bainite is increased when the cooling rate continues to increase.After cooling to 650℃ with the cooling rate more than 4 ℃/s and the cooling rate variable is reduced to a half between650 ℃ to 300 ℃,the final microstructure is similar to that achieved with continuous cooling,but bainite transformation end temperature increased and the transformation region was reduced. After trial production by two different cooling methods,the mechanical properties and microstructures of the tested steel are similar,thus the method of stacking cooling in slow cooling pit under 650 ℃ can improve the qualified rate in flaw detection of steel plates.
Using Gleeble 2000 thermo-mechanical simulator,the phase transformation behavior of Q500 bridge steels was studied after cooling with constant and cooling with variable rate 650 ～ 300 ℃,and a trial production of Q500 q was also carried out. Results showed that: the final microstructure is ferrite and pearlite when the cooling rate is 1 ～4 ℃/s,and bainite transformation occurred when the cooling rate increased from 4 ℃/s to 16 ℃/s. The microstructure is refined and the volume fraction of bainite is increased when the cooling rate continues to increase.After cooling to 650℃ with the cooling rate more than 4 ℃/s and the cooling rate variable is reduced to a half between650 ℃ to 300 ℃,the final microstructure is similar to that achieved with continuous cooling,but bainite transformation end temperature increased and the transformation region was reduced. After trial production by two different cooling methods,the mechanical properties and microstructures of the tested steel are similar,thus the method of stacking cooling in slow cooling pit under 650 ℃ can improve the qualified rate in flaw detection of steel plates.
引文
[1]凤懋润.中国公路桥梁建设的历史性成就[J].中国公路,2018,50(9):25-27.(Feng Maorun.Historic achievements of highway and bridge construction in C hina[J].C hina Highw ay,2018,50(9):25-27.)
[2]陈焕德,刘东升.TMCP型Q500qENH特厚耐候桥梁钢板的工业试制[J].钢铁,2014,49(4):69-73.(Chen Huande,Liu Dongsheng.Industrial run to produce T M C P processed Q 500qEN H w eathering heavy plate for bridge[J].Iron and Steel,2014,49(4):69-73.)
[3]田海鹏,陈明,姜娅峰.通过QC活动提高800 MPa级钢岔管洞内焊缝一次探伤合格率[J].水资源开发与管理,2017,(12):39-44.(Tian Haipeng,Chen Ming,Jiang Yafeng.Improvement of grade 800 M Pa steel bifurcated pipe tunnel w eld primary flaw detection qualification rate through Q C activity[J].W ater R esources and M anagement,2017,(12):39-44.)
[4]郝鑫,臧淼,尹绍江,等.提高探伤板材堆垛缓冷厚度的研究[J].宽厚板,2017,23(6):30-32.(Hao Xin,Zang Miao,Yin Shaojiang,et al.Study on increasing stack cooling thickness of steel plate requiring flaw detection[J].Wide and Heavy Plate,2017,23(6):30-32.
[5]周雯,吴开明,王厚昕,等.高性能桥梁钢Q370qE_HPS过冷奥氏体连续冷却相变行为[J].材料热处理学报,2015,36(Supplement):94-98.(Zhou Wen,Wu Kaiming,Wang Houxin,et al.Super cooled austenite transformation during continuous cooling of Q370qE-HPS high performance steels[J].Transactions of Materials and Heat Treatment,2015,36(Supplement):94-98.)
[6]Zhao J W,Jiang Z Y,Kin J S,et al.Effects of tungsten on continuous cooling transformation characteristics of microalloyed steels[J].Materials&Design,2013,49(3):252-258.
[7]邱春林,王建刚,高秀华,等.EH36高强度船板钢奥氏体连续冷却的转变行为[J].机械工程材料,2015,30(12):76-79.(Qiu Chunlin,Wang Jiangang,Gao Xiuhua,et al.Transformation behavior of austenite of EH36 ship plate steel during continuous cooling[J].Materials for Mechanical Engineering,2015,30(12):76-79.)
[8]于驰,高秀华,王平,等.货油舱用耐蚀钢连续冷却的转变规律[J].东北大学学报(自然科学版),2015,36(4):482-486.(Yu Chi,Gao Xiuhua,Wang Ping,et al.Continuous cooling transformation of corrosion resistant steel for cargo oil tank[J].Journal of Northeastern University(Natural Science),2015,36(4):482-486.)
[9]王凤维.轧制工艺参数对高强度桥梁钢组织和力学性能的影响[J].热加工工艺,2016,45(23):162-165.(Wang Fengwei.Effect of rolling process parameters on microstructure and mechanical properties of high strength steel for bridge[J].Hot Working Technology,2016,45(23):162-165.)
[10]Li H J,Li Z L,Yu G,et al.Development of new generation cooling control system after rolling in hot rolled strip based on UFC[J].Journal of Iron and Steel Research International,2013,20(7):29-34.
[11]冯路路,卢正红,姜全新,等.Q500q探伤缺陷的成因与对策[J].物理测试,2018,36(1):51-54.(Feng Lulu,Lu Zhenghong,Jiang Quanxin,et al.Causes and countermeasures of the ultra sonic testing defect in Q500q[J].Physics Examination and Testing,2018,36(1):51-54.)
[2]陈焕德,刘东升.TMCP型Q500qENH特厚耐候桥梁钢板的工业试制[J].钢铁,2014,49(4):69-73.(Chen Huande,Liu Dongsheng.Industrial run to produce T M C P processed Q 500qEN H w eathering heavy plate for bridge[J].Iron and Steel,2014,49(4):69-73.)
[3]田海鹏,陈明,姜娅峰.通过QC活动提高800 MPa级钢岔管洞内焊缝一次探伤合格率[J].水资源开发与管理,2017,(12):39-44.(Tian Haipeng,Chen Ming,Jiang Yafeng.Improvement of grade 800 M Pa steel bifurcated pipe tunnel w eld primary flaw detection qualification rate through Q C activity[J].W ater R esources and M anagement,2017,(12):39-44.)
[4]郝鑫,臧淼,尹绍江,等.提高探伤板材堆垛缓冷厚度的研究[J].宽厚板,2017,23(6):30-32.(Hao Xin,Zang Miao,Yin Shaojiang,et al.Study on increasing stack cooling thickness of steel plate requiring flaw detection[J].Wide and Heavy Plate,2017,23(6):30-32.
[5]周雯,吴开明,王厚昕,等.高性能桥梁钢Q370qE_HPS过冷奥氏体连续冷却相变行为[J].材料热处理学报,2015,36(Supplement):94-98.(Zhou Wen,Wu Kaiming,Wang Houxin,et al.Super cooled austenite transformation during continuous cooling of Q370qE-HPS high performance steels[J].Transactions of Materials and Heat Treatment,2015,36(Supplement):94-98.)
[6]Zhao J W,Jiang Z Y,Kin J S,et al.Effects of tungsten on continuous cooling transformation characteristics of microalloyed steels[J].Materials&Design,2013,49(3):252-258.
[7]邱春林,王建刚,高秀华,等.EH36高强度船板钢奥氏体连续冷却的转变行为[J].机械工程材料,2015,30(12):76-79.(Qiu Chunlin,Wang Jiangang,Gao Xiuhua,et al.Transformation behavior of austenite of EH36 ship plate steel during continuous cooling[J].Materials for Mechanical Engineering,2015,30(12):76-79.)
[8]于驰,高秀华,王平,等.货油舱用耐蚀钢连续冷却的转变规律[J].东北大学学报(自然科学版),2015,36(4):482-486.(Yu Chi,Gao Xiuhua,Wang Ping,et al.Continuous cooling transformation of corrosion resistant steel for cargo oil tank[J].Journal of Northeastern University(Natural Science),2015,36(4):482-486.)
[9]王凤维.轧制工艺参数对高强度桥梁钢组织和力学性能的影响[J].热加工工艺,2016,45(23):162-165.(Wang Fengwei.Effect of rolling process parameters on microstructure and mechanical properties of high strength steel for bridge[J].Hot Working Technology,2016,45(23):162-165.)
[10]Li H J,Li Z L,Yu G,et al.Development of new generation cooling control system after rolling in hot rolled strip based on UFC[J].Journal of Iron and Steel Research International,2013,20(7):29-34.
[11]冯路路,卢正红,姜全新,等.Q500q探伤缺陷的成因与对策[J].物理测试,2018,36(1):51-54.(Feng Lulu,Lu Zhenghong,Jiang Quanxin,et al.Causes and countermeasures of the ultra sonic testing defect in Q500q[J].Physics Examination and Testing,2018,36(1):51-54.)