注塑机螺杆表面激光Cr-Mo-B合金化层制备及工艺研究
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摘要
为改善螺杆的表面性能,通过激光合金化技术在45钢表面制备Cr-Mo-B三元合金化涂层,优化合金化涂层的成分及工艺,并对最佳工艺下的Cr-Mo-B合金化涂层的组织和性能进行评价。结果表明:激光Cr-Mo-B合金化涂层最佳成分的质量比为3∶7∶90,最佳工艺参数激光功率为3.1 kW,扫描速度为54 m/h,搭接率为33.3%;其合金化区组织为Cr2B、FeB、FeMo、Fe-Cr、CrxFey,形态为柱状晶;最佳工艺下的硬度可达1 020HV0.1,磨损率为1.723×10-14m3/(N·m),磨损体积为0.047 mm3,磨损体积比基体(0.140 mm3)减少0.093 mm3。
The work aims to improve the service life of injection molding machine screw. The alloying layer of the chromiummolybdenum-boron was prepared on the surface of 45 steel by laser alloying technology,the composition and process of the alloying layer were optimized,and the microstructure and properties of the alloying layer under the optimized process were evaluated. The optimal composition ratio of laser chromium-molybdenum-boron was 3∶7∶90,and the optimal process parameters of chromium molybdenum boron alloying for 45 steel were obtained,they are laser power 3.1 kW,laser scanning speed 54 m/h,and the laser lap rate 33.3%. The alloying zone consist of Cr2 B、FeB、FeMo、Fe-Cr、CrxFeyphase. The hardness of chromiummolybdenum-boron alloy coating under the optimal process can reach up to 1 020 HV0.1,the wear rate is 1.723×10-14 m~3/(N·m),and the wear volume is 0.047 mm~3,the wear volume is 0.093 mm~3 less than that of the matrix(0.140 mm~3).
The work aims to improve the service life of injection molding machine screw. The alloying layer of the chromiummolybdenum-boron was prepared on the surface of 45 steel by laser alloying technology,the composition and process of the alloying layer were optimized,and the microstructure and properties of the alloying layer under the optimized process were evaluated. The optimal composition ratio of laser chromium-molybdenum-boron was 3∶7∶90,and the optimal process parameters of chromium molybdenum boron alloying for 45 steel were obtained,they are laser power 3.1 kW,laser scanning speed 54 m/h,and the laser lap rate 33.3%. The alloying zone consist of Cr2 B、FeB、FeMo、Fe-Cr、CrxFeyphase. The hardness of chromiummolybdenum-boron alloy coating under the optimal process can reach up to 1 020 HV0.1,the wear rate is 1.723×10-14 m~3/(N·m),and the wear volume is 0.047 mm~3,the wear volume is 0.093 mm~3 less than that of the matrix(0.140 mm~3).
引文
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[14]HUA Xiaozhen,ZHOU Lang,CUI Xia,et al. The Effect of ammonia water on the microstructure and performance of plasma electrolytic saturation nitriding layer of 38CrMoAl steel[J].Physics Procedia,2013,50:304-314.
[2]叶宏,闫忠琳. H13模具钢表面Ni-Al-Fe渗层组织与性能[J].金属热处理,2013,38(12):18-20.
[3]张伟. P20模具钢表面合金化组织与性能[J].中国表面工程,2012,25(3):68-70.
[4]刘福全.激光技术在汽车工业中的应用[J].黑龙江交通科技,2008(11):141-142.
[5]林基辉,李耀,杨梦梦,等. 45钢表面激光钼合金化层的制备工艺和硬度研究[J].热加工工艺,2018,47(14):127-129.
[6]何骅波,杨梦梦,黄晓波,等.螺杆钢表面不同激光熔覆层的耐磨与耐腐蚀性能[J].机械工程材料,2017,41(10):11-14.
[7]林基辉,李耀,郭栋,等. 45钢激光表面铬合金化的制备工艺[J].金属热处理,2018(12):170-173.
[8]蒲飞,刘元富,徐向阳,等.激光表面合金化制备TiC/TiAl复合涂层组织及TiC演变机制[J].金属热处理,2017,42(1):120-123.
[9]蒋平,张继娟,于利根,等. Ti-6Al-4V合金激光表面合金化制备Ti5Si3/Ti耐磨复合材涂层研究[J].稀有金属材料与工程,2000(4):269-272.
[10]熊绪刚,刘文今,张红军,等.球墨铸铁活塞环激光合金化及其摩擦磨损特性的研究[J].金属热处理,2000(7):5-7.
[11]张伟,姚建华. 40Cr钢表面激光合金化及其在螺杆强化中的应用[J].金属热处理,2007,32(11):59-61.
[12]张洪宇,何波,楚莎莎,等.钴基高温合金的激光成型工艺研究[J].热加工工艺,2017,46(14):40-44.
[13]CHEN Shintsung,TANG Weiyeh,KUO Yenfu,et al. Microstructure and properties of age-hardenable AlxCrFe1.5MnNi0.5alloys[J]. Materials Science&Engineering A,2010,527(21/22):5818-5825.
[14]HUA Xiaozhen,ZHOU Lang,CUI Xia,et al. The Effect of ammonia water on the microstructure and performance of plasma electrolytic saturation nitriding layer of 38CrMoAl steel[J].Physics Procedia,2013,50:304-314.