CN104685073B - 用于热处理钢构件的方法及钢构件 - Google Patents
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- 239000010959 steel Substances 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 50
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 37
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000005255 carburizing Methods 0.000 claims abstract description 19
- 229910001563 bainite Inorganic materials 0.000 claims abstract description 6
- 238000005096 rolling process Methods 0.000 claims description 12
- 238000005452 bending Methods 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 claims description 2
- 238000010791 quenching Methods 0.000 abstract description 5
- 230000000171 quenching effect Effects 0.000 abstract description 5
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- 229910001566 austenite Inorganic materials 0.000 description 4
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- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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Abstract
一种用于热处理钢构件(10,12,14,16)的方法,其包括以下步骤:a)以在1.0以上的碳势对所述钢构件(10,12,14,16)进行渗碳,b)以在0.6以上的碳势对所述钢构件(10,12,14,16)进行渗碳,c)淬火所述钢构件(10,12,14,16),以及d)使所述钢构件(10,12,14,16)经历贝氏体处理。
Description
技术领域
本发明涉及用于热处理钢构件(steel component)的方法以及已经经历所述方法的钢构件。
背景技术
渗碳(Carburizing)是一种热处理工艺,其中铁或钢吸收在含碳材料存在下加热金属时所释放的碳以达到使金属变得更硬的目的。受影响区域的碳含量能够随渗碳时间和温度而变。渗碳时间越长和温度越高导致扩散进入金属的碳越多和碳扩散的深度越大。当通过淬火(quenching)使铁或钢快速冷却时,外表面因更高碳含量经过奥氏体转化为马氏体而变硬,而型芯(core)因铁素体和/或珠光体的显微结构而保持柔软和韧性。对放置于与高碳气体、液体或固体接触的工件(workpiece)最常使用渗碳。渗碳制造具有高达10mm的表层硬度深度的硬工件表面和具有韧性和延展性的工件型芯。
在金属的渗碳区域(表层)和基体材料(型芯)之间产生的体积变化形成压缩残余应力(compressive residual stress,CRS)。希望在金属中形成最大的压缩应力。然而,过度渗碳金属可能造成的风险是淬火裂纹、高表面残余奥氏体(high surface retainedaustenite)、因马氏体收缩导致的尺寸不稳定性和低CRS。
发明内容
本发明的目的是提供一种用于热处理钢构件的改进方法。
通过包括以下步骤的方法实现了这一目的:a)以在1.0以上的碳势对钢构件(10,12,14,16)进行渗碳,然后b)以在0.6以上的碳势对钢构件(10,12,14,16)进行渗碳,c)淬火钢构件(10,12,14,16),并且当钢构件冷却时,d)使钢构件(10,12,14,16)经历贝氏体处理,其中这些步骤优选依次进行。
本发明基于这样的认识:热处理钢构件时使用的渗碳碳势和硬化周期(hardeningcycle)影响钢构件的压缩残余应力并进而影响其物理性质。已经发现,在渗碳过程(步骤b))的扩散阶段(diffusion phase)使用较低的碳势导致钢构件中较低的碳含量,这就物理性质例如压缩残余应力、旋转弯曲疲劳(rotating bending fatigue,RBF)和韧性而言是有利的。如果希望高水平的CRS,应该在渗碳过程(步骤b))的扩散阶段中使用0.6~1.2的碳势、优选0.6-0.9或0.65-0.85的碳势。贝氏体淬火(步骤d)进一步增加CRS。
根据本发明的一项实施方式,以1.0~1.4的碳势进行步骤a)。
根据本发明的另一项实施方式,在940~1000℃、或更具体地在940~980℃、例如在970℃的温度下进行步骤a)和/或步骤b)。
根据本发明的一项实施方式,在200~240℃、或更具体地在215~220℃的温度下进行步骤d)。
根据本发明的另一项实施方式,钢构件包含碳含量为0.1~0.4重量%的钢,例如18CrNiMo7-6。
根据本发明的另一项实施方式,所述方法包括在160~240℃、或更具体地在190~210℃、例如在200℃的温度下e)冷却钢构件和f)回火(tempering)钢构件的步骤。
根据本发明的实施方式,钢构件包括或构成辊压元件(rolling element)或滚柱(roller)或用于经受交变赫兹应力(例如,滚动接触或滚动和滑动的组合)的应用的钢构件,例如旋转轴承或轴承座圈(raceway for a bearing)。钢构件可以包括或构成齿轮牙、凸轮(cam)、转轴、轴承、紧固件、销(pin)、汽车离合板、刀具(tool)或模具(die)。钢构件可以例如构成滚柱轴承、针状轴承、圆锥滚柱轴承、球面滚柱轴承、环形滚柱轴承或止推轴承。钢构件可以用在汽车绕组(automotive wind)、船舶(marine)、金属制造或其它需要高耐磨性的应用中。
根据本发明的实施方式,所述方法用于改进钢构件的以下性质中的至少一种:压缩残余应力(CRS)、旋转弯曲疲劳(结构疲劳)、承重能力、耐磨性、耐蚀性、硬度、摩擦性质、韧性、使用寿命。
本发明还涉及已经使用本发明的实施方式的方法热处理的钢构件,所述钢构件表现出150~200MPa或更高的平均CRS,其是使用钻孔方法离表面0.5~1.0mm处测得的。
附图说明
下文将结合附图借助非限定性的实施例进一步解释本发明,其中:
图1示出了根据现有技术的热处理方法,
图2示出了根据本发明实施方式的热处理方法,
图3示出了经受现有技术的热处理和本发明实施方式的热处理方法的钢样品的压缩残余应力,以及
图4示出了根据本发明实施方式的钢构件。
应该指出,没有按照比例绘制这些附图,为了清楚起见,放大了某些特征的尺寸。
具体实施方式
图1示出了根据现有技术的热处理循环。在970℃的温度下,首先以1.2的碳势对钢构件进行渗碳,然后以0.65~0.85的碳势进行渗碳。然后对钢构件进行淬火并使其在较高的贝氏体温度区域(regime)下经受氢喷射处理(hydrogen effusion treatment)。使钢构件冷却,并且然后使其再次硬化和回火。已经发现,用这种方式热处理的钢构件表现出相对低水平的CRS,即50~100Mpa的平均CRS,其是在离表面0.5-1.0mm之间测得的。
图2示出了根据本发明实施方式的热处理方法。该方法包括以下步骤:a)在第一渗碳步骤中,在970℃的温度以在1.0以上、例如1.0-1.4的碳势对包含具有0.1~0.4重量%碳含量的钢的钢构件进行渗碳,和b)在第二渗碳步骤中,以在0.6以上、例如0.6~1.2、优选0.6~0.9的碳势对钢构件进行渗碳。就在热处理后的钢构件中的CRS和RBF水平而言,使用步骤b)中的所述较低碳势是有利的,其对于回火前实现淬火状态中的充分硬度是足够的。
所述方法包括步骤c)在油浴或盐浴中淬火钢构件,其中选择浴温以实现最佳性质的同时,具有可接受的尺寸变化水平。可以使用热油/盐浴淬火以使复杂零件(intricatepart)的变形最小化。然后,d)使钢构件经历在220℃温度下的贝氏体处理,e)冷却至例如室温,和f)在200℃下回火。
由于钢构件中碳含量较低,所以淬裂的风险较小,并且钢构件将会具有增加的强度。实现低保留奥氏体水平,以便可以使用较低的回火温度的同时,保持高CRS水平。此外,由于长时间的热暴露带来的马氏体收缩所导致的尺寸不稳定性会降低,从而允许使用较低的回火温度。
可以例如在200℃的温度下实施低温回火(步骤f)以对钢构件增韧。回火后,将该构件冷却至例如室温,并然后可以将其用于可能经历常规操作循环下应力、应变、冲击和/或磨损的任何应用中。
使用根据本发明实施方式的方法热处理的钢构件表现出150~200Mpa或更高的平均CRS,其是使用钻孔方法离表面0.5~1.0mm处测得的。即,通过降低渗碳步骤b)的扩散阶段的碳势和改变从马氏体淬火至贝氏体淬火的淬火模式增大了钢构件的CRS。使用根据本发明的实施方式的方法热处理的钢构件也比经历根据现有技术热处理的钢构件包含更细的晶粒。
实施图2所示的方法比实施图1所示的方法所需的时间更少,因为图2所示的方法不包括在320℃下的贝氏体处理后的硬化(harden)钢构件的工艺步骤。因此,缩短交付周期(lead times)和降低成本是可行的。
使用根据本发明的方法还允许通过在渗碳步骤a)和/或b)期间选择合适的碳势使钢构件的CRS和硬度符合要求。
可以使用经历本发明实施方式的方法的钢构件,随后进行或不进行研磨操作。
图3示出了经历根据现有技术(在图3的左下方和右下方的图)的热处理和根据本发明实施方式(在图3的左上方和右上方的图)的热处理方法的钢样品的压缩残余应力。
图3的左上方的图示出了在渗碳步骤b)的扩散阶段期间的碳势对经历本发明方法的18CrNiMo7-6钢的CRS和表面深度(case depth)的影响。
图3的右上方的图示出了在渗碳步骤b)的扩散阶段期间的碳势对经历本发明方法的18NiCrMo14-6钢的CRS和表面深度的影响。
从左上方和右上方的图中可以看出在渗碳步骤b)的扩散阶段期间介于0.65和0.85之间的碳势导致最高的CRS水平。
图3的左下方的图示出了在渗碳步骤b)的扩散阶段期间的碳势对经历现有技术热处理的18CrNiMo7-6钢的CRS和表面深度的影响。图3的右下方的图示出了在渗碳步骤b)的扩散阶段期间的碳势对经历现有技术热处理的18NiCrMo14-6钢的CRS和表面深度的影响。可以看出根据本发明的方法导致钢构件具有比已经经历根据现有技术的热处理的钢构件更高的CRS水平。
图4示出了根据本发明实施方式的钢构件的实例,即滚动元件轴承(rollingelement bearing)10,其尺寸直径可以在10mm至几米内变化,并且该轴承具有从几十克至数千吨的负荷能力(load-carrying capacity)。换言之,根据本发明的轴承10可以为任意尺寸并且具有任意负荷能力。该轴承10具有内环12和外环14以及一组滚动元件16。可以使该滚动元件轴承10的内环12、外环14和/或滚动元件16,以及优选的滚动元件轴承10的全部的滚动接触部分表面的至少一部分,经历根据本发明的方法。
已经经历本发明实施方式的方法的所述钢构件10、12、14、16会表现出增强的轴承性能,例如滚动接触疲劳,并由此由于压缩残余应力水平的增加,使用寿命延长。
权利要求范围内的本发明的进一步修改对于技术人员将是显而易见的。
Claims (11)
1.一种用于热处理钢构件(10,12,14,16)的方法,其特征在于,所述方法包括以下步骤:
a)以在1.0以上的碳势对所述钢构件(10,12,14,16)进行渗碳,
b)以在0.6以上的碳势对所述钢构件(10,12,14,16)进行渗碳,
c)将所述钢构件(10,12,14,16)淬火,以及
d)使所述钢构件(10,12,14,16)经历贝氏体处理,
其中在200~240℃的温度下实施步骤d),且在940~1000℃的温度下实施步骤b)。
2.根据权利要求1的方法,其特征在于,以1.0~1.4的碳势实施步骤a)。
3.根据权利要求1或2的方法,其特征在于,以0.6~1.2的碳势实施步骤b)。
4.根据权利要求1或2的方法,其特征在于,在940~1000℃的温度下实施步骤a)。
5.根据权利要求1或2的方法,其特征在于,所述钢构件(10,12,14,16)包括具有0.1~0.4重量%的碳含量的钢。
6.根据权利要求5的方法,其特征在于,所述钢为18CrNiMo7-6钢。
7.根据权利要求1或2的方法,其特征在于,所述方法包括以下步骤:e)冷却所述钢构件(10,12,14,16),以及f)在160~240℃的温度下回火所述钢构件(10,12,14,16)。
8.根据权利要求1或2的方法,其特征在于,所述钢构件(10,12,14,16)包括或构成滚压元件或滚柱或用于经历交变赫兹应力的应用的钢构件。
9.根据权利要求1或2的方法,其特征在于,所述方法是用于改进钢构件(10,12,14,16)的以下性质中的至少一种的方法:压缩残余应力(CRS)、旋转弯曲疲劳、承重能力、耐磨性、耐蚀性、硬度、摩擦性质、韧性、使用寿命。
10.经历权利要求1-9中任一项的方法的钢构件,其特征在于,所述钢构件表现出150MPa或更高的平均CRS,其是使用钻孔方法离表面0.5~1.0mm处测得的。
11.根据权利要求10的钢构件,其特征在于,所述钢构件表现出150~200MPa的平均CRS,其是使用钻孔方法离表面0.5~1.0mm处测得的。
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