离心铸造低合金铸铁轧辊表面缺陷分析
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摘要
借助OM、SEM及体视显微镜,分析了离心铸造低合金铸铁轧辊表面缺陷的微观特征、组织、夹杂物类型及成分等。结果表明,轧辊中存在大量孔洞,孔洞最深可达16.23μm,离心铸造轧辊主要组织是珠光体+渗碳体,基体中有MnS、TiC与VC析出,并存在P偏聚区。结合实际生产工艺分析了离心铸造铸铁轧辊表面锈斑缺陷产生的原因,并提出了改进措施。
The microscopic characteristics,microstructure and inclusions of surface defects in centrifugal casting low alloy iron casting mill roller were analyzed by optical microscope and scanning electron microscope,stereoscopic microscopes.The results show that there exist a lot of holes in the mill roller with the depth of 16.23μm.The microstructure is composed of pearlite and cementite,and MnS inclusion and TiC as well as VC precipitates can be observed,and phosphorus segregation zone in the matrix is present.The reasons of the centrifugal casting defects were analyzed according to the production process,and the countermeasures were provided.
The microscopic characteristics,microstructure and inclusions of surface defects in centrifugal casting low alloy iron casting mill roller were analyzed by optical microscope and scanning electron microscope,stereoscopic microscopes.The results show that there exist a lot of holes in the mill roller with the depth of 16.23μm.The microstructure is composed of pearlite and cementite,and MnS inclusion and TiC as well as VC precipitates can be observed,and phosphorus segregation zone in the matrix is present.The reasons of the centrifugal casting defects were analyzed according to the production process,and the countermeasures were provided.
引文
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[2]叶以富,范同祥.白口铸铁碳化物的团球化[J].现代铸铁,1995(3):28-32.
[3]叶以富.钒对低铬白口铸铁碳化物的团球化影响[J].现代铸铁,1988(3):21-24,59.
[4]程瑞国,曾建辉,李子海,等.钒钛耐磨铸钢生产工艺与性能研究[J].现代铸铁,2012,32(2):90-92.
[5]张伟.低铬钒钛铸铁铁型的试制及应用[J].铸造,2006,55(4):411-412.
[6]程先军,张玉光.大型船用气缸套离心铸造缺陷分析与防止[J].铸造技术,2014(6):1 352-1 353.
[7]杨文.离心铸造中磷铸铁汽缸套缩松缺陷的产生及抑制[J].活塞·活塞环·气缸套∶轴瓦经验交流,1991(1):23-25.
[8]高玉章.离心复合轧辊辊身裂纹缺陷分析与控制[J].特种铸造及有色合金,2011,31(7):646-647.
[9]李洪生,高辉.钢中硫化锰的形态及对钢性能的影响[J].一重技术,2004(4):26-28.
[10]姜锡山.连铸钢缺陷分析与对策[M].北京:机械工业出版社,2012.
[11]薄鑫涛.关于钢中的磷[J].热处理,2015(5):40-42.
[12]罗全顺,陆文华.磷对双金属铸铁面粉磨辊的组织和性能的影响[J].铸造,1988(10):4-7.
[13]郦晓慧,黄发,王俭秋,等.TiN夹杂物对690合金管在高温高压水中的腐蚀和应力腐蚀行为的影响[J].金属学报,2011,47(7):847-852.
[14]罗逸.天然气井油管腐蚀沟槽的形成原因[J].天然气工业,2002,22(1):95-97.
[15]贾丽敏,徐达鸣,赵光伟,等.离心力对TC4钛合金铸件孔洞及线收缩率的影响[J].特种铸造及有色合金,2009,29(9):827-829.