CN110904405B - 一种提高钛合金表面激光渗锆改性层冶金质量的方法 - Google Patents
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Abstract
一种提高钛合金表面激光渗锆改性层冶金质量的方法,首先在脉冲激光输出模式下对激光渗锆工艺窗口进行初步优化;利用有限元传热模型对初步优化参数下熔池三维温度场进行计算,获得熔池瞬时温度变化曲线;分别提取熔池瞬时温度曲线峰值温度的平均值Tmax,计算单个脉冲周期温度曲线与液相线截距t及熔池冷却阶段的平均冷却速率ξ;根据1.5Tm≤Tmax≤1.6Tm,45ms≤t≤90ms,1.0×103℃/s≤ξ≤5.0×104℃/s原则对工艺参数进行优化,获得的优化工艺窗口,按优化工艺参数进行激光3D打印,获得致密、高冶金质量的表面渗锆改性层。本发明能有效提高表面渗锆改性层质量,进而提高力学性能。
Description
技术领域
本发明涉及激光金属材料加工领域,尤其涉及一种提高钛合金表面激光渗锆改性层冶金质量的方法。
背景技术
钛合金因具有密度小、比强度高、耐蚀性好等优良特性,已广泛应用于航空航天、航海、能源及化工等领域。然而,钛合金表面硬度低、耐磨性差等缺点,使钛合金难以满足实际应用的要求,阻碍了钛合金的进一步应用。
目前,钛合金表面改性技术主要包括微弧氧化、离子注入、化学镀、气相沉积、激光熔覆及等离子喷涂等。其中,激光熔覆改性技术是将粉末与激光束同步输送,通过高能量密度激光束辐照基材表面,使粉末材料熔化,经快速凝固后形成良好冶金结合的改性层。如Weng等人在TC4钛合金表面熔覆SiC,通过与基体反应生成Si5Si3和TiC,进而提高钛合金表面的硬度和耐磨性。姜爱龙等人为提高TC11钛合金摩擦磨损性能,对钛合金表面进行了渗锆处理。其结果表明,渗层厚度约为25μm,且渗锆层组织均匀,主要由α-Ti相组成。吴红艳等人采用双层辉光等离子渗金属技术在TC4钛合金表面制备渗锆层,发现渗锆层的组织连续、均匀、致密,与基体结合良好,锆含量由表层向基体内部呈梯度分布;渗锆层的摩擦因数和比磨损率约为TC4钛合金基体的45.9%和13.6%,摩擦磨损性能明显提高。此外,研究表明,采用激光熔覆技术在钛合金表面熔覆或渗入锆颗粒,可以有效提高摩擦磨损性能。然而,目前激光渗锆技术仍存在一些问题,如渗层内部容易产生气孔、裂纹等缺陷。这限制了该技术的进一步应用。因此,需要对钛合金激光渗锆过程中冶金质量进行有效控制。
本发明提出方法可对钛合金表面激光渗锆改性层冶金质量进行有效控制,进而提高渗层的力学性能。
发明内容
本发明的目的是提供一种提高钛合金表面激光渗锆改性层冶金质量的方法。
一种提高钛合金表面激光渗锆改性层冶金质量的方法,其特征在于包括以下步骤:
步骤一:将激光器设置为脉冲激光输出模式,对激光表面渗锆工艺窗口进行初步优化,获得初步优化的工艺窗口:激光波形为方波,光斑直径0.5~2.5mm,离焦量-2.5mm,激光峰值功率为700~1000W,重复频率为10~40Hz,占空比为0.6~0.9,扫描速度为6~13mm/s,送粉量为2~7g/min;
步骤二:任意选取一组初步优化的工艺参数,利用有限元传热模型对该参数下熔池三维温度场进行计算,提取激光加载1.5秒后熔池中心瞬时温度变化曲线;提取并计算熔池瞬时温度变化曲线波峰温度的平均值Tmax,计算瞬时温度变化曲线中单个脉冲周期内温度变化曲线与钛合金液相线的截距t,再对单个脉冲周期内温度变化曲线右侧温度下降部分进行求导,再计算出导数的平均值ξ,即获得熔池平均冷却速率ξ,其中Tmax、t及ξ的单位分别为℃、s及℃/s;
步骤三:根据1.5Tm≤Tmax≤1.6Tm,45ms≤t≤90ms,1.0×103℃/s≤ξ≤5.0×104℃/s原则对激光光斑直径、激光峰值功率、重复频率、占空比、离焦量、扫描速度及送粉量工艺参数进行优化,其中Tm为钛合金的熔点;
步骤四:按上述各个参数的由小至大顺序重复步骤二至步骤三,直到完成所有工艺参数匹配,获得的优化工艺窗口:激光波形为方波,激光光斑直径1.0~1.5mm,激光峰值功率为700~850W,重复频率为10~25Hz,占空比为0.75~0.9,离焦量-2.5mm,扫描速度为7~12mm/s,送粉量为3~6g/min;
步骤五:按上述工艺参数进行钛合金表面激光渗锆,获得致密、高冶金质量的表面渗锆改性层。
所述钛合金包括α钛合金、α+β钛合金及β钛合金。
在步骤四中,所述的工艺窗口的扫描路径为单向路径或双向路径。
通过本发明方法获得优化工艺窗口:激光波形为方波,激光光斑直径1.0~1.5mm,激光峰值功率为700~850W,重复频率为10~25Hz,占空比为0.75~0.9,离焦量-2.5mm,扫描速度为7~12mm/s,送粉量为3~6g/min;在此条件进行钛合金表面激光渗锆,获得致密、高冶金质量的表面渗锆改性层。
附图说明
图1为本发明获得的钛合金表面激光渗锆试样的金相图;
图2为已有方法获得的钛合金表面激光渗锆试样的金相图。
具体实施方式
下面结合附图和具体实施方式对本发明做进一步的说明。
实施例1
一种提高钛合金表面激光渗锆改性层冶金质量的方法,包括以下步骤:
一种提高钛合金表面激光渗锆改性层冶金质量的方法,其特征在于包括以下步骤:
步骤一:将激光器设置为脉冲激光输出模式,对激光表面渗锆工艺窗口进行初步优化,获得初步优化的工艺窗口:激光波形为方波,光斑直径0.5~2.5mm,离焦量-2.5mm,激光峰值功率为700~1000W,重复频率为10~40Hz,占空比为0.6~0.9,扫描速度为6~13mm/s,送粉量为2~7g/min;
步骤二:任意选取一组初步优化的工艺参数,利用有限元传热模型对该参数下熔池三维温度场进行计算,提取激光加载1.5秒后熔池中心瞬时温度变化曲线;提取并计算熔池瞬时温度变化曲线波峰温度的平均值Tmax,计算瞬时温度变化曲线中单个脉冲周期内温度变化曲线与钛合金液相线的截距t,再对单个脉冲周期内温度变化曲线右侧温度下降部分进行求导,再计算出导数的平均值ξ,即获得熔池平均冷却速率ξ,其中Tmax、t及ξ的单位分别为℃、s及℃/s;
步骤三:根据1.5Tm≤Tmax≤1.6Tm,45ms≤t≤90ms,1.0×103℃/s≤ξ≤5.0×104℃/s原则对激光光斑直径、激光峰值功率、重复频率、占空比、离焦量、扫描速度及送粉量工艺参数进行优化,其中Tm为钛合金的熔点;
步骤四:按上述各个参数的由小至大顺序重复步骤二至步骤三,直到完成所有工艺参数匹配,获得的优化工艺窗口:激光波形为方波,激光光斑直径1.0~1.5mm,激光峰值功率为700~850W,重复频率为10~25Hz,占空比为0.75~0.9,离焦量-2.5mm,扫描速度为7~12mm/s,送粉量为3~6g/min;
步骤五:按上述工艺参数进行钛合金表面激光渗锆,获得致密、高冶金质量的表面渗锆改性层。
图1为采用所获得的钛合金表面激光渗锆试样的金相图。从图中可以看出,试样几乎完全致密,内部冶金质量良好。因为采用本方法,由于激光能量的周期性输入,会导致熔池周期性重熔,有利于气孔的去除;另一方面,采用本专利方法能保证单个脉冲周期内熔池有足够的温度及时间(1.5Tm≤Tmax≤1.6Tm,45ms≤t≤90ms)处于熔化状态,有利于锆颗粒的充分润湿及熔化。上述结果表明,采用本专利方法可以有效地提高渗锆改性层的冶金质量,进而提高改性层的力学性能。
图2为采用已有方法所获得的钛合金表面激光渗锆试样经机械研磨、抛光后的金相图,从图中可以看出,试样中存在大量的气孔及不规则孔洞,表明试样内部质量较差。这可能与加工过程气体的卷入或锆颗粒与钛合金基体的湿润性差所导致。
Claims (3)
1.一种提高钛合金表面激光渗锆改性层冶金质量的方法,其特征在于包括以下步骤:
步骤一:将激光器设置为脉冲激光输出模式,对激光表面渗锆工艺窗口进行初步优化,获得初步优化的工艺窗口:激光波形为方波,光斑直径0.5~2.5mm,离焦量-2.5mm,激光峰值功率为700~1000W,重复频率为10~40Hz,占空比为0.6~0.9,扫描速度为6~13mm/s,送粉量为2~7g/min;
步骤二:任意选取一组初步优化的工艺参数,利用有限元传热模型对该参数下熔池三维温度场进行计算,提取激光加载1.5秒后熔池中心瞬时温度变化曲线;提取并计算熔池瞬时温度变化曲线波峰温度的平均值Tmax,计算瞬时温度变化曲线中单个脉冲周期内温度变化曲线与钛合金液相线的截距t,再对单个脉冲周期内温度变化曲线右侧温度下降部分进行求导,再计算出导数的平均值ξ,即获得熔池平均冷却速率ξ,其中Tmax、t及ξ的单位分别为℃、s及℃/s;
步骤三:根据1.5Tm≤Tmax≤1.6Tm,45ms≤t≤90ms,1.0×103℃/s≤ξ≤5.0×104℃/s原则对激光光斑直径、激光峰值功率、重复频率、占空比、离焦量、扫描速度及送粉量工艺参数进行优化,其中Tm为钛合金的熔点;
步骤四:按上述各个参数的由小至大顺序重复步骤二至步骤三,直到完成所有工艺参数匹配,获得的优化工艺窗口:激光波形为方波,激光光斑直径1.0~1.5mm,激光峰值功率为700~850W,重复频率为10~25Hz,占空比为0.75~0.9,离焦量-2.5mm,扫描速度为7~12mm/s,送粉量为3~6g/min;
步骤五:按上述工艺参数进行钛合金表面激光渗锆,获得致密、高冶金质量的表面渗锆改性层。
2.根据权利要求1所述的一种提高钛合金表面激光渗锆改性层冶金质量的方法,其特征在于:所述钛合金选自α钛合金、α+β钛合金或β钛合金。
3.根据权利要求1所述的一种提高钛合金表面激光渗锆改性层冶金质量的方法,其特征在于:在步骤四中,所述的工艺窗口的扫描路径为单向路径或双向路径。
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