摘要
利用等温淬火贝氏体球铁所制水泵的使用寿命是普通灰口铸铁水泵的３一５倍，但因这种材料的生产工艺复杂而使其推广应用受到了限制。为了既能提高水泵的使用寿命，又能简化材料的生产工艺，对在普通灰口铸铁中加入适量的钨、钼、铜所获钨钼铜贝氏体灰口铸铁的组织与耐冲蚀磨损性能进行了试验研究，扫描电子显微镜和透射电子显微镜观察发现，在钨和钼的加入量分别为１．５０％（ｗｔ）和０．６０％（ｗｔ）时，钨钼铜贝氏体灰口铸铁的组织为细小片状石墨、贝氏体基体和少量的白亮区。其中，贝氏体基体系由大量板条状无碳化物贝氏体和少量细针状贝氏体组成，其抗拉强度为４５０一５５０ＭＰａ，硬度为ＨＢ２８０一３５０。冲蚀磨损对比试验结果表明，钨钼铜贝氏体灰口铸铁的耐冲蚀磨损性能分别是普通灰口铸铁和硼铜合金铸铁的４．８３倍和１．６５倍，并与等温淬火贝氏体球铁的相当。
he life-span of water pumps made of bainitic nodular cast iron by isothermalhardening is 2 to 4 times longer than that of common grey cast iron. Because of complicatedproduction process,however,its popularity and applications are limited.In order to increase thelife-span of water-pumps and simplify the production process, the microstructure and the erosionwear resistance of W-Mo-Cu bainitic grey cast iron obtained by adding suitable W,Mo and Cuelements in common grey cast iron was studied.The observation by scanning electron microscopeand transmission electron microscope found that when W and Mo content is 1.50%(wt)and0.60%(wt)respectively,microstructure of W-Mo-Cu bainitic grey cast iron is fine aciculargraphite, bainitic matrix and small quantity of white-bright region. And bainitic matrix consists oflarge quantity of platelet bainite without carbide and small quantity of acicular bainite. Its tensilestrength is 450一500MPa and hardness is HB 280一350.The contrast test results of erosion wearshown that erosion wear resistance of W-Mo-Cu bainitic grey cast iron is 4. 83 times and 1.65 timescomparing with that of common grey cast iron and B-Cu alloying cast iron respectively,and is thesame as that of bainitic nedular cast iron by isothermal hardening.
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
1994年第3期252-258,共7页
Tribology
关键词
灰口铸铁
贝氏体
冲蚀磨损
水泵
grey cast iron,bainite, erosion wear,water-pump material
