回火温度对工程机械用1000MPa级高强钢组织与性能的影响
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摘要
研究了淬火态的工程机械用1000 MPa级高强钢在不同温度回火100 min后的组织和性能。结果表明,淬火态1000 MPa级高强钢于500~750℃回火,随回火温度升高,合金组织中淬火马氏体逐渐转变为回火马氏体、回火托氏体及回火索氏体,强度和硬度逐渐下降,伸长率和低温冲击功逐渐增加。回火温度为550~650℃时,合金获得最佳的力学性能匹配。回火温度超过700℃,合金发生再结晶,生成多边形铁素体,晶界碳化物球化长大,合金强度和硬度显著降低。
Microstructure and mechanical properties of quenched engineering mechanical 1000 MPa high-strength steel with tempering at different temperature for 100 min were studied. The results show that quenched martensite transforms into tempered martensite, tempered tootsie and tempered sorbite with the increase of tempering temperature in the range of 500 to750 ℃. The strength and the hardness decrease gradually while the elongation and the low temperature impact energy increase gradually. When tempering in 550-650 ℃, its mechanical properties are best. When tempering temperature is over 700 ℃,recrystallization occurs. The microstructure transforms into polygonal ferrite and carbides at grain boundary spheroidize and grow up. The strength and the hardness reduce significantly.
Microstructure and mechanical properties of quenched engineering mechanical 1000 MPa high-strength steel with tempering at different temperature for 100 min were studied. The results show that quenched martensite transforms into tempered martensite, tempered tootsie and tempered sorbite with the increase of tempering temperature in the range of 500 to750 ℃. The strength and the hardness decrease gradually while the elongation and the low temperature impact energy increase gradually. When tempering in 550-650 ℃, its mechanical properties are best. When tempering temperature is over 700 ℃,recrystallization occurs. The microstructure transforms into polygonal ferrite and carbides at grain boundary spheroidize and grow up. The strength and the hardness reduce significantly.
引文
[1]Fang Z Z,Wang Xu,Ryu Taegong,et al.Synthesis,sintering,and mechanical properties of nanocrystalline cemented tungsten carbide review[J].International Journal of Refractory Metals and Hard Materials,2009,27(2):288-299.
[2]郑华,刘昌明,韩荣东,等.960MPa级含钼低碳钢钼含量与热处理工艺的确定[J].机械工程材料,2012,34(2):8-11.
[3]Ouchi C.Development of steel plates by intensive use of TMCP and direct quenching processes[J].ISIJ International,2001,41(6):542-553.
[4]王立军,武会宾,余伟,等.直接淬火低碳贝氏体钢的回火组织与力学性能[J].材料工程,2011,(3):36-39.
[5]Nagao A,Ito T,Obinata T.Development of YP960 and 1100MPa class ultra high strength steel plates with excellent toughness and high resistance to delayed fracture for construction and industrial machinery[J].JFE Technical Report,2008(11):13-18.
[6]李灿明,王建景,闫志华.国内工程机械用钢的发展现状和市场预测[J].山东冶金,2008,30(5):9-11.
[7]武会滨,尚成嘉,赵运堂,等.回火对低碳贝氏体钢组织稳定性及性能的影响[J].钢铁,2005,40(3):62-65.
[8]Lee W S,Su T T.Mechanical properties and microstructural features of AISI 4340 high-strength alloy steel under quenched and tempered conditions[J].Journal of Materials Processing Technology,1999(87):198-206.
[9]徐祖耀,曹四维.回火马氏体脆性的机制[J].金属学报,1987,23(6):477-483.
[10]Caron R N,Krauss G.The tempering of Fe-C lath martensite[J].Metallurgical Transactions,1972(3):2381-2389.
[11]姚可夫,钱滨,石伟,等.马氏体回火过程中组织转变量预测的实验研究[J].金属学报,2003,39(8):893-896.
[12]刘彦明,石凯,周勇,等.9Ni钢的热处理及低温韧度[J].热加工工艺,2007,36(16):77-80.
[2]郑华,刘昌明,韩荣东,等.960MPa级含钼低碳钢钼含量与热处理工艺的确定[J].机械工程材料,2012,34(2):8-11.
[3]Ouchi C.Development of steel plates by intensive use of TMCP and direct quenching processes[J].ISIJ International,2001,41(6):542-553.
[4]王立军,武会宾,余伟,等.直接淬火低碳贝氏体钢的回火组织与力学性能[J].材料工程,2011,(3):36-39.
[5]Nagao A,Ito T,Obinata T.Development of YP960 and 1100MPa class ultra high strength steel plates with excellent toughness and high resistance to delayed fracture for construction and industrial machinery[J].JFE Technical Report,2008(11):13-18.
[6]李灿明,王建景,闫志华.国内工程机械用钢的发展现状和市场预测[J].山东冶金,2008,30(5):9-11.
[7]武会滨,尚成嘉,赵运堂,等.回火对低碳贝氏体钢组织稳定性及性能的影响[J].钢铁,2005,40(3):62-65.
[8]Lee W S,Su T T.Mechanical properties and microstructural features of AISI 4340 high-strength alloy steel under quenched and tempered conditions[J].Journal of Materials Processing Technology,1999(87):198-206.
[9]徐祖耀,曹四维.回火马氏体脆性的机制[J].金属学报,1987,23(6):477-483.
[10]Caron R N,Krauss G.The tempering of Fe-C lath martensite[J].Metallurgical Transactions,1972(3):2381-2389.
[11]姚可夫,钱滨,石伟,等.马氏体回火过程中组织转变量预测的实验研究[J].金属学报,2003,39(8):893-896.
[12]刘彦明,石凯,周勇,等.9Ni钢的热处理及低温韧度[J].热加工工艺,2007,36(16):77-80.