h13热锻模具更佳硬度,H13钢热挤压模具热处理工艺的.doc
H13 钢热挤压模具热处理技术技术
引言
H13 钢材是目前世界上应用更广泛的热挤压模具钢之一,因为它具有很强的淬透性、韧性和热疲劳性,被广泛应用于制造热挤压模具、铝合金压铸模具和热锻模具。热处理过程是在钢材化学成分不变的前提下,改变其组织和结构的更佳方法。但对 H13 对钢模进行表面改性解决,是全面改善模具寿命的关键。而且表面渗氮是更常用的表面处理方法。渗氮的质量直接关系到磨具的使用寿命。
本文以具体的生产为基础 H13 作为研究材料,钢铝型材挤压磨具对其氮化层机构进行了仔细的观察,对其性
能和失效原因进行了硬度测量等测试。并通过 XRD 实验,观察透射图普,分析其性能。热处理采用不同的淬火和回火形式,并进行金相试验,观察其组织,测量其强度,从而进行比较和分析,找出较好的组织特性,进而明确较好的热处理工艺。研究结果表明:原因 H13 由于氮化机构粗壮,氮化层白亮层消退,钢无效的重要原因。H13通过热处理发现 钢铁经油淬后机构更佳,淬火组织变化与回火温度密切相关。在 350℃时淬火机构为回火马氏体,淬火组织形态与淬火组织形态差别不大,均为板条形。随着淬火温度的升高 450℃的机构仍然是回火马氏体。回火温度到 淬火机构在550℃左右向淬火托氏体发生变化,合金氮化物沉淀,部分渗碳体聚集生长。在降低之前,随着淬火温度的升高强度。
关键字:H13 钢材,热处理,氮化层, 淬火机构 热挤压
H13 steel with high hardenability,strength and toughness,thermal fatigue behavior is
widely used in and abroad,which can be used in the manufacture of hot extrusion
die,aluminium alloy die-casting die,hot forging die,etc,In nowadays,H13 steel is one of the
most widely used hot die steel in worldwide.
The heat treatment process is the most effective method to change the microstructure of
steels while the chemical composition is invariable.And for H13 steel die surface modification
treatment,is the key to comprehensively improve the die life.Surface nitriding is the most
common surface preparation methods .The stand or fall of nitriding have the direct bearing on
the service life of mould.
Based on the actual production of aluminum extrusion dies of H13 steel as the research
material.By observing the nitrided lauer, hardness
measurement experiments, analysis of its
performance and failure reasons.And though the XRD experiment,observed diffraction
pattern,analyzes its performance.
Through the different way of quenching and tempering heatment, and metallographic
experiment,observe its organization, measuring its hardness, so as to compare and
analysis ,find better organizational performance,good heat treatment method.
Key words:H13 steel, heat treatment , nitrided layer ,tempered structure
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