42Cr Mo钢已成功地用作小功率(2 MW及以下)风电偏航轴承套圈用钢,但由于其有限的淬透性,无法满足大功率风电偏航轴承套圈用钢的要求,因此,研究中引入40Cr Ni Mo钢和硼微合金化42Cr Mn Mo B钢进行对比分析。研究42Cr Mn Mo B钢、40Cr Ni...42Cr Mo钢已成功地用作小功率(2 MW及以下)风电偏航轴承套圈用钢,但由于其有限的淬透性,无法满足大功率风电偏航轴承套圈用钢的要求,因此,研究中引入40Cr Ni Mo钢和硼微合金化42Cr Mn Mo B钢进行对比分析。研究42Cr Mn Mo B钢、40Cr Ni Mo钢和42Cr Mo钢的淬透性,利用DEFORM3D模拟软件对5 MW风电偏航轴承套圈壁厚1/4位置处的油冷速率进行模拟,并利用模拟热处理炉对三种钢进行模拟热处理,随后对试验钢进行常规力学性能的测试。结果表明,42Cr Mn Mo B钢在端淬距离为85 mm位置处的硬度值为46 HRC,油淬后的理想临界直径约为160 mm,远高于42Cr Mo钢在85 mm位置处的29 HRC和43 mm的理想临界直径;经DEFORM3D模拟软件模拟的5 MW级风电偏航轴承壁厚1/4位置处的平均油冷速率约为0.7℃/s;在模拟油冷并经590℃回火1 h处理后42Cr Mn Mo B钢各项力学性能均能满足5 MW级风电偏航轴承套圈用钢的性能要求,具有应用于大功率风电偏航轴承套圈中的潜能。展开更多
Internal grinding is more difficult than surface grinding and cylindrical grinding. But littleresearch work in this field has been done. In this paper, based on a series of investigations, in-ternal grinding with vitr...Internal grinding is more difficult than surface grinding and cylindrical grinding. But littleresearch work in this field has been done. In this paper, based on a series of investigations, in-ternal grinding with vitrified bond CBN wheels was proposed. The method is considered mostsuitable for grinding ball-bearing parts in mass production as well as for CNC grinder. Thetheoretical analyses or internal grinding are also given, and a large number of textile machineparts-shell roller(the material is bearing steel GCr15) were grinded using Cr-corundumwheels and cubic boron nitride(CBN) wheels. Experiments indicated that grinding with CBNwheels had technical and economical advantages, and it might be used in a wider range.展开更多
通过对不同下贝氏体含量的复相组织的轴承钢所进行的系统的接触疲劳试验研究,找出了贝氏体量与接触疲劳寿命之间的关系。提出以强韧性综合参量 K 值代表材料的强韧性,证明该参量与疲劳寿命中值、金相组织、硬度及断口形貌参数有良好的...通过对不同下贝氏体含量的复相组织的轴承钢所进行的系统的接触疲劳试验研究,找出了贝氏体量与接触疲劳寿命之间的关系。提出以强韧性综合参量 K 值代表材料的强韧性,证明该参量与疲劳寿命中值、金相组织、硬度及断口形貌参数有良好的对应关系,可用于最佳组织设计。展开更多
Morphology,distribution and crystal structures of age-precipitated particles in practical Cu-bearing steels with ultra-low carbon were studied by high resolution electron microscopy（HREM）.The age-precipitation behav...Morphology,distribution and crystal structures of age-precipitated particles in practical Cu-bearing steels with ultra-low carbon were studied by high resolution electron microscopy（HREM）.The age-precipitation behavior was explored when poly-microalloying elements Cu,Nb,Cr,Mo and Ni were used and ε-Cu particles coexisted with carbides（carbonitrides） in steels.The fine dispersed ε-Cu particles and carbides of microalloying element Nb,Cr,Mo being about 10 nm only in size were observed in peak aging specimens and over-aging specimens.The twin structures and stacking faults in the particles and the transient structures formed in the early stage of the particle precipitation were also observed.The crystal structure of three types of age-precipitation particles was firstly identified by lattice streaks in HREM images of the single particles.The experimental method identifying crystal structure of fine and dispersed particles using HREM images of single particle was proposed.展开更多
文摘Internal grinding is more difficult than surface grinding and cylindrical grinding. But littleresearch work in this field has been done. In this paper, based on a series of investigations, in-ternal grinding with vitrified bond CBN wheels was proposed. The method is considered mostsuitable for grinding ball-bearing parts in mass production as well as for CNC grinder. Thetheoretical analyses or internal grinding are also given, and a large number of textile machineparts-shell roller(the material is bearing steel GCr15) were grinded using Cr-corundumwheels and cubic boron nitride(CBN) wheels. Experiments indicated that grinding with CBNwheels had technical and economical advantages, and it might be used in a wider range.
基金supported by the National High-Tech Research and Development Program of China ("863 Program", Grant Nos. 2007AA03A228 and 2005AA305G70)
文摘Morphology,distribution and crystal structures of age-precipitated particles in practical Cu-bearing steels with ultra-low carbon were studied by high resolution electron microscopy（HREM）.The age-precipitation behavior was explored when poly-microalloying elements Cu,Nb,Cr,Mo and Ni were used and ε-Cu particles coexisted with carbides（carbonitrides） in steels.The fine dispersed ε-Cu particles and carbides of microalloying element Nb,Cr,Mo being about 10 nm only in size were observed in peak aging specimens and over-aging specimens.The twin structures and stacking faults in the particles and the transient structures formed in the early stage of the particle precipitation were also observed.The crystal structure of three types of age-precipitation particles was firstly identified by lattice streaks in HREM images of the single particles.The experimental method identifying crystal structure of fine and dispersed particles using HREM images of single particle was proposed.
