潘伟
,
李祖来
,
山泉
,
蒋业华
,
冯志扬
,
周荣
材料研究学报
用水冷+盐浴等温淬火、空冷+盐浴等温淬火和直接盐浴等温淬火等方式对中碳低合金钢进行热处理,借助彩色金相技术和XRD分析方法研究了热处理方式对合金钢组织、力学性能的影响,并探索了性能与组织的关联性.结果表明,对中碳低合金钢进行空冷+盐浴等温淬火和水冷+盐浴等温淬火热处理,可得到不同下贝氏体含量的贝氏体/马氏体复相组织,材料的性能比铸态有大幅度地提高,冲击韧性提高92%-183%、硬度提高31%-55%.对材料进行空冷+盐浴等温淬火热处理,随着空冷时间的增加复相组织中下贝氏体含量逐渐降低、马氏体含量逐渐升高,而硬度和冲击韧性分别呈增加和降低趋势.中碳低合金钢的性能与各组织的含量密切相关,当下贝氏体含量为30%-40%、马氏体含量50%-60%时,贝氏体/马氏体复相组织强韧性匹配较好,材料具有较高的综合性能.
关键词:
金属材料
,
贝氏体/马氏体复相组织
,
等温淬火
,
彩色金相
,
韧性断裂
ZHOU Jiyang Dalian University of Technology
,
Liaoning
,
ChinaW.SCHMITZ S.ENGLER Aachen Institute of Technology
,
FRG Associate Professor
,
Divisionof Foundry
,
Dalian Institute of Technology
,
Liaoning
,
China
金属学报(英文版)
To study the growth of austenitic shells around the spheroidal graphite,color metallography has been employed.It is found that the shell is not a continuous layer of austenite,but a clus- ter of wedge-shaped crystals.Three types of shells have been observed.That may strongly af- fect the deterioration of the spheroidal graphite.The mechanism of the formation of the austenitic shells has also been discussed.
关键词:
Spheroidal graphite
,
null
,
null
,
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