CN109161649A - If钢制备超硬马氏体钢的方法 - Google Patents

If钢制备超硬马氏体钢的方法 Download PDF

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CN109161649A
CN109161649A CN201811432992.XA CN201811432992A CN109161649A CN 109161649 A CN109161649 A CN 109161649A CN 201811432992 A CN201811432992 A CN 201811432992A CN 109161649 A CN109161649 A CN 109161649A
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steel
superhard
temperature
martensite
pressure
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张洪旺
王作华
孙海东
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Yanshan University
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Abstract

本发明属于冶金技术领域，特别是涉及一种IF钢制备超硬马氏体钢的方法，将加工、组装后的IF钢放入六面顶压机中对六个面同时施加压力；加热至材料相变温度区间；保温5‑60分钟；然后开始降温，在降温的过程中仍保持预设的压力；温度降至室温后，开始卸压。本发明提供的IF钢制备超硬马氏体钢的方法，简单，易于实现的IF钢的硬化方法，硬度最高提高了13倍，并且获得的多种形态的马氏体组织，比如板条、透镜形状。

Description

IF钢制备超硬马氏体钢的方法
技术领域
本发明属于冶金技术领域，特别是涉及一种IF钢制备超硬马氏体钢的方法。
背景技术
金属材料的诸多性能都取决于材料的内部结构，如：位错、孪晶、晶界等。上世纪八十年达兴起的纳米材料和严重塑性变形也旨在提高晶体缺陷密度。
在钢的强化中，马氏体相变最早被应用，而且目前应用最广的在于钢的强化。现今大多结构钢件还是以淬火得到马氏体、然后回火，产生马氏体的目的就是强化，但是对于IF钢是很难通过正常的淬火产生马氏体的。
晶体缺陷类型因应力大小而发生变化，外加应力的提高导致晶体缺陷由位错转变为变形孪晶，而内应力随含碳量的增加也导致由位错马氏体转变为孪晶马氏体。相比于人为的外加应力，相变应力属于大自然的馈赠，对之加以利用则可以成为行之有效的且低能环保的晶体缺陷调控资源。
IF钢具有极优异的深冲性能，现在伸长率和r值可达50％和2.0以上，在汽车工业上得到了广泛应用。
同时又在硬度低，不抗冲击易变形、不具耐磨性极大地限制了它的应用。
发明内容
本发明的目的在于提供一种IF钢制备超硬马氏体钢的方法，通过约束相变的方法在IF钢中获得超马氏体。
具体技术方案为：
IF钢制备超硬马氏体钢的方法，包括以下步骤：
a.将加工、组装后的IF钢放入六面顶压机中对六个面同时施加压力；施加压力的范围为0.8～5Gpa。
b.在达到预设压力后加热至材料相变温度区间；加热温度为900～1200℃。
c.达到预设温度后，保温5-60分钟；
d.然后开始降温，在降温的过程中仍保持预设的压力；
e.温度降至室温后，开始卸压。
本发明与现有技术相比有以下优点：相比于普通的淬火处理，本发明提供的IF钢制备超硬马氏体钢的方法，简单，易于实现的IF钢的硬化方法，硬度最高提高了13倍，并且获得的多种形态的马氏体组织，比如板条、透镜形状。
附图说明
图1是实施例中得到的超硬板条马氏体金相组织；
图2是实施例中得到的超硬板条马氏体的TEM明场像；
图3是实施例中得到的超硬透镜状马氏体金相组织，其硬度在850HV左右；
图4是实施例中透镜马氏体中脊处的TEM的暗场像。
具体实施方式
结合实施例说明本发明的具体技术方案。
取IF钢试样，其化学成分(质量分数wt％)如下表1：
表1IF钢试样化学成分
C Si Mn P S Cr Ni Cu
0.0021 ＜0.01 0.13 0.0086 0.0086 0.017 0.013 0.015
Ti Nb Al B N 0 Sn
0.056 ＜0.01 0.040 0.0008 0.0019 0.0015 0.0011
a.取直径2mm，高度2mm的IF钢试样，组装后放入SPT6X600T六面顶液压机加压至1Gpa；
b.在压力达到1GPa后，以每秒100℃的速率加热至1050℃；
c.然后在1GPa的压力下，保温30分钟；
d.以每秒10℃的开始降温；
e.降至室温后，开始卸压。
所述的超硬板条马氏体金相组织如图1所示，其硬度最高达1050HV。
形状为板条形的超硬马氏体，TEM明场像如图2所示。
也可以得到透镜状的超硬马氏体，金相组织如图3所示，其硬度在850HV左右；图4为透镜马氏体中脊处的TEM的暗场像。

Claims (3)

1.IF钢制备超硬马氏体钢的方法，其特征在于，包括以下步骤：
a.将加工、组装后的IF钢放入六面顶压机中对六个面同时施加压力；
b.在达到预设压力后加热至材料相变温度区间；
c.达到预设温度后，保温5-60分钟；
d.然后开始降温，在降温的过程中仍保持预设的压力；
e.温度降至室温后，开始卸压。
2.根据权利要求1所述的IF钢制备超硬马氏体钢的方法，其特征在于，步骤a的施加压力的范围为0.8～5Gpa。
3.根据权利要求1所述的IF钢制备超硬马氏体钢的方法，其特征在于，步骤b加热温度为900～1200℃。
CN201811432992.XA 2018-11-28 2018-11-28 If钢制备超硬马氏体钢的方法 Pending CN109161649A (zh)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109825691A (zh) * 2019-03-07 2019-05-31 燕山大学 一种奥氏体晶粒细化的中碳钢及其制备方法
CN111057825A (zh) * 2020-01-16 2020-04-24 燕山大学 一种兼备高硬度和高抗氧化性铁铬合金的制备方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1043160A (zh) * 1988-12-05 1990-06-20 住友金属工业株式会社 超微细组织的金属材料及其制造方法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1043160A (zh) * 1988-12-05 1990-06-20 住友金属工业株式会社 超微细组织的金属材料及其制造方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109825691A (zh) * 2019-03-07 2019-05-31 燕山大学 一种奥氏体晶粒细化的中碳钢及其制备方法
CN111057825A (zh) * 2020-01-16 2020-04-24 燕山大学 一种兼备高硬度和高抗氧化性铁铬合金的制备方法

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Application publication date: 20190108