通过金相组织观察、低温冲击试验和拉伸试验及拉伸断口形貌观察,研究了铌对正火＋调质处理低温钢组织及性能的影响。结果表明：铸态下随着试样中铌含量的增加,组织中珠光体片间距逐渐减小,经过930℃正火＋900℃淬火＋630℃回火热处理后,铌质量分数为0.039%的试样组织及综合性能最佳,组织为回火索氏体,-20、-40℃夏比冲击功分别达到44.4和28.4J,抗拉强度和屈服强度分别为995和885MPa,断后伸长率达到17.0%。
The effect of niobium on microstructure and properties of cryogenic steels was investigated by microstruc ture observation, low-temperature impact toughness test, in this paper. The results show that Nb addition in steels tensile strength test and tensile fracture surface inspection can decrease the lamellar spacing of pearlite as cast. The samples containing 0. 039% Nb have the best microstructure and mechanical properties after normalizing（930 ℃）, quenching（900 ℃） and tempering（630℃ ）. The microstructure is tempered sorbite. The Charpy-V impact energies are 44.4J at -20 ℃ and 28.4J at -40 ℃, respectively, and tensile strength, yield strength and percentage elongation after fracture are 995MPa, 885MPa and 17.0% .
参考文献
| [1] | 张华,赵勇辉,罗金恒,张广利,赵新伟.天然气管道阀门断裂原因的三维有限元分析[J].管道技术与设备,2007(01):32-33. |
| [2] | 贺祖武,胡小鹏.试论低温钢低温韧性的改善[J].洪都科技,2004(03):33-35. |
| [3] | 郑云海,于国良.钢制阀门常用主体材料[J].阀门,2004(03):15-34. |
| [4] | 王祖滨.低合金钢和微合金钢的发展[J].中国冶金,1999(03):23. |
| [5] | 王景德.化学成分与热处理工艺对LCC钢低温冲击值的影响[J].中国铸造装备与技术,2004(04):37-39. |
| [6] | 万荣春,赵星明,斯松华,袁晓敏.Nb含量对低碳微合金钢热处理组织与性能的影响[J].安徽工业大学学报（自然科学版）,2007(02):134-136. |
| [7] | 雍岐龙;马鸣图;吴宝榕.微合金钢-物理和力学冶金[M].北京:机械工业出版社,1989 |
| [8] | 黄振东.钢铁金相图谱[M].北京:中国科技文化出版社,2005 |
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