工程机械用30CrNi3MoV钢的热处理与组织性能
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摘要
对比分析了锻态和调质态电渣重熔和非电渣重熔30CrNi3MoV钢的显微组织和力学性能,在此基础上,研究了Mn和Si含量对非电渣重熔钢组织、力学性能和耐腐蚀性能的影响。结果表明:电渣重熔并不能改善锻态试验用钢的晶粒度,但是贝氏体组织会有所细化;经过调质热处理后,电渣重熔钢和非电渣重熔钢的晶粒都有明显细化,组织都为细小回火索氏体;调质态电渣重熔钢和非电渣重熔钢具有相似的力学性能,且都满足工程机械用钢的使用要求。Mn含量的提高有利于细化调质态非电渣重熔钢的晶粒,而Si含量的提高对晶粒度的影响较小;适当增加Mn和Si元素含量有助于提高试验用钢的抗拉强度、屈服强度和布氏硬度,但是塑性和低温冲击韧性会有所降低;调质态非电渣重熔钢中增加Mn含量会降低材料的耐腐蚀性能,而增加Si含量有助于提高材料的耐腐蚀性能。同时增加Mn和Si含量的调质态非电渣重熔钢具有较好的强塑性、-40℃冲击韧性和耐蚀性能。
The microstructure and mechanical properties of the forged and tempered electroslag remelted( ESR) and non-ESR30 CrNi3 MoV steels were compared and analyzed. On this basis,the effects of Mn and Si content on the microstructure,mechanical properties and corrosion resistance of non-ESR steel were studied. The results show that electroslag remelting can not improve the grain size of the forged steel,but the bainite structure will be refined. After the quenching and tempering heat treatment,the grains of the ESR steel and the non-ESR steels are all refined,and the microstructure is fine tempered sorbite. The quenched and tempered ESR and non-ESR steels have similar mechanical properties,which are all meet the requirements of the use of steel for construction machinery. The increase of the content of Mn is beneficial to refining the grains of the quenched and tempered non-ESR steel,while the increase of the content of Si has little effect on the grain size. The proper increase of Mn and Si elements can help to improve the tensile strength,yield strength and Brinell hardness of the test steel,but the ductility and low temperature impact toughness will be reduced. Increasing the content of Mn in quenched and tempered non-ESR steel will reduce the corrosion resistance of the material,while increasing the content of Si will improve the corrosion resistance of the material. The quenched and tempered non-ESR steel has good plasticity,-40 ℃ impact toughness and corrosion resistance.
The microstructure and mechanical properties of the forged and tempered electroslag remelted( ESR) and non-ESR30 CrNi3 MoV steels were compared and analyzed. On this basis,the effects of Mn and Si content on the microstructure,mechanical properties and corrosion resistance of non-ESR steel were studied. The results show that electroslag remelting can not improve the grain size of the forged steel,but the bainite structure will be refined. After the quenching and tempering heat treatment,the grains of the ESR steel and the non-ESR steels are all refined,and the microstructure is fine tempered sorbite. The quenched and tempered ESR and non-ESR steels have similar mechanical properties,which are all meet the requirements of the use of steel for construction machinery. The increase of the content of Mn is beneficial to refining the grains of the quenched and tempered non-ESR steel,while the increase of the content of Si has little effect on the grain size. The proper increase of Mn and Si elements can help to improve the tensile strength,yield strength and Brinell hardness of the test steel,but the ductility and low temperature impact toughness will be reduced. Increasing the content of Mn in quenched and tempered non-ESR steel will reduce the corrosion resistance of the material,while increasing the content of Si will improve the corrosion resistance of the material. The quenched and tempered non-ESR steel has good plasticity,-40 ℃ impact toughness and corrosion resistance.
引文
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[5]张凯,易小刚,彭倩筠,等.热处理工艺对工程机械用1000 MPa级高强钢组织与性能的影响[J].机械工程材料,2014,38(4):29-34.Zhang Kai,Yi Xiaogang,Peng Qianyun,et al. Effect of heat treatment process on structure and properties of 1000 MPa high strength steel for construction machinery[J]. Materials for Mechanical Engineering,2014,38(4):29-34.
[6]王世森,余宏伟,熊玉彰,等.高强度工程机械用钢Q550的回火工艺[J].金属热处理,2013,38(4):53-56.Wang Shisen,Yu Hongwei,Xiong Yuzhang,et al. Tempering process of Q550 steel for high strength construction machinery[J]. Heat Treatment of Metals,2013,38(4):53-56.
[7]肖毅强,蒙秋红,邓颖章,等.感应淬火对38MnVS6非调质钢组织和冲击性能的影响[J].金属热处理,2018,43(4):106-110.Xiao Yiqiang, Meng Qiuhong, Deng Yingzhang, et al. Effect of induction quenching on the structure and impact properties of 38MnVS6non-quenched and tempered steel[J]. Heat Treatment of Metals,2018,43(4):106-110.
[8]Kan M E A,Kan R A,Doruk M. Determination of susceptibility to intergranular corrosion of UNS 31803 type duplex stainless steel by electrochemical reactivation method:A comparative study[J].International Journal of Corrosion,2012,6(6):323-335.
[9]吴俊升,林超,彭冬冬,等. Q345D低合金钢在海洋潮差区的腐蚀规律及电化学行为研究[J].机械工程学报,2016,52(20):30-37.Wu Junsheng,Lin Chao,Peng Dongdong,et al. Corrosion regularity and electrochemical behavior of Q345D low alloy steel in ocean tidal range[J]. Journal of Mechanical Engineering,2016,52(20):30-37.
[10]Kim H J,Jeon S H,Kim S T,et al. Investigation of the sensitization and intergranular corrosion of tube-to-tube sheet welds of hyper duplex stainless steel using an electrochemical reactivation method[J].Corrosion Science,2014,87(5):60-70.