摘要
对于一种自行设计成分的超高强度衬板用合金钢进行了热处理试验,采用正交试验及极差分析的方法,分析了热处理参数对试验钢力学性能的影响。通过冲击磨料磨损试验,对比优化后工艺及原有工艺的耐磨性,进一步研究了热处理参数对耐磨性的影响。结果表明,各热处理参数对硬度均影响不大,回火温度对试验钢的屈服强度和抗拉强度影响最大,淬火温度对试验钢的冲击韧性影响最大。试验钢的最优热处理工艺为:(950℃保温1.5h)油淬+(300℃保温2h)回火+空冷至室温。试验钢在热处理后获得了均匀的贝氏体+马氏体+残余奥氏体混合组织,抗拉强度达到1839MPa,屈服强度达到1631MPa,硬度达到50.1HRC,冲击韧性值达到11.9J/cm2,综合力学性能良好,且耐磨性在任何冲击功条件下均高于原有工艺。
Orthogonal test and range analysis were utilized for researching the influence of heat treatment pa rameters on mechanical properties of ultra-high strength steel which is used for crusher liner. The relationship be- tween heat treatment parameters and wear resistance were further studied by comparing the wear resistance of opti- mized process and original process through impact-abrasive wear test. The results show that tempering temperature affected tensile strength and yield strength most, however, the quenching temperature had the most important inf- luence on impact toughness. The heat treatment process ultra-high alloy steel was optimized as quenching at 950℃and holding for 1.5 h and then tempering at 300 ℃ for 2 h. Uniform composite tissues of bainite, martensite and re- tained austenite were obtained under the optimizing heat treatment process, and the excellent mechanical properties were as follows： tensile strength of 1839 MPa, yield strength of 1631 MPa, hardness of 50. 1HRC, and the standard V impact toughness of 11.9 J/cm2 , and the wear resistance were better than all of the original process, which meets the requirements of cone crusher liner.
关键词
热处理工艺
正交试验
超高强度
冲击磨料磨损
heat treatment process
orthogonal test
ultra-high strength
impact-abrasive wear
