45钢激光铬硼合金化层微观组织和硬度的研究
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摘要
为改善注塑机螺杆的表面性能,本文利用激光合金化技术在45钢表面制备了铬硼合金化层,研究了不同激光合金化工艺对铬硼合金化层微观组织和硬度的影响。研究表明:随激光输出功率的增大,铬硼合金化层表面硬度先升高后降低;随着激光扫描速率的增大,铬硼合金化层的表面硬度逐渐降低;随着激光搭接率的增加,铬硼合金化层表面硬度先升高后降低。经该工艺处理的铬硼合金化层,由合金化区和热影响区组成,合金化区的平均硬度约为941.57HV0.1,热影响区硬度从870.00HV0.1到230.00HV0.1呈梯度分布。
The chromium-boron alloying layer is prepared on the surface of steel 45 by laser alloying technology to promote the surface properties of injection molding machines screws, thus the different irradiation to Cr-B alloying layer's microstructure and hardness have been studied. The results show that the surface hardness of Cr-B alloying layer increases first and then decreases with the increase of laser output power. With the increase of laser scanning rate, the surface hardness of Cr-B alloying layer decreases gradually; with the increase of laser lap rate, the surface hardness of Cr-B alloying layer increases first and then decreases. The chrome-boron alloying layer treated by this process is composed of alloying zone and heat-affected zone. The average hardness in alloying zone is about 941.57 HV0.1, and the hardness of heat-affected zone is gradient distribution from870 HV0.1 to 230 HV0.1 which appers graded distribution.
The chromium-boron alloying layer is prepared on the surface of steel 45 by laser alloying technology to promote the surface properties of injection molding machines screws, thus the different irradiation to Cr-B alloying layer's microstructure and hardness have been studied. The results show that the surface hardness of Cr-B alloying layer increases first and then decreases with the increase of laser output power. With the increase of laser scanning rate, the surface hardness of Cr-B alloying layer decreases gradually; with the increase of laser lap rate, the surface hardness of Cr-B alloying layer increases first and then decreases. The chrome-boron alloying layer treated by this process is composed of alloying zone and heat-affected zone. The average hardness in alloying zone is about 941.57 HV0.1, and the hardness of heat-affected zone is gradient distribution from870 HV0.1 to 230 HV0.1 which appers graded distribution.
引文
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[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(03):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, 133.
[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, 19.
[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, 43(12):170-173.
[8]蒲飞,刘元富,徐向阳,等.激光表面合金化制备TiC/TiA l复合涂层组织及TiC演变机制[J].金属热处理, 2017,42(01):120-123.
[9]蒋平,张继娟. Ti-6Al-4V合金激光表面合金化制备Ti5Si3/Ti耐磨复合材[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,(07):5-7.
[11] CHEN S T, TANG W Y, KUO Y F, et al. Microstructure and properties of age-hardenable AlxCrF e1.5MnNi0.5alloys[J]. Materials Science&Engineering A, 2010, 527(21):5818-5825.
[12] WANG J H, FANG D R, ZHANG K. Properties of 38CrMoAlA and 40Cr Steels After Different Nitriding Processes[J]. Heat Treatment of Metals, 2003,(07):20-23.