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首页> 外文会议>Researches in Powder Metallurgy >Effect of Different Vacuum Heat Treatments on the Microstructure of a Low Alloyed Sintered Steel
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Effect of Different Vacuum Heat Treatments on the Microstructure of a Low Alloyed Sintered Steel

机译：不同真空热处理对低合金烧结钢组织的影响

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摘要

The main aim of the present contribution is to show how different heat treatment conditions influence the microstructure of a Fe - [1.5Cr - 0.2Mo] - 0.6C powder system. In vacuum furnaces, the cooling rate is generally determined by the pressure of the gas (basically N_2) introduced into the chamber. Different gas pressures have been applied, from 0 to 6 bars. The average cooling rates were calculated in the range of 1180℃ to 400℃ and were varying from 0.1 to 6℃/s, according to the gas pressure. Considering the cooling rates, increasing the nitrogen pressure resulted in an increased amount of bainite/martensite microstructure. The microstructure constituents ranged from 97% pearlite + 3% ferrite in the system treated at 0 bar to 82 % martensite + 18 % bainite (with small amount of tempered martensite) in the system cooled applying N_2 at 6 bars. Mechanical properties have been evaluated in terms of toughness, TRS and hardness for all processing conditions; the analysis of the properties allowed to plot graphs correlating the different properties as function of the characteristic microstructures.
机译：本发明的主要目的是表明不同的热处理条件如何影响Fe-[1.5Cr-0.2Mo]-0.6C粉末体系的微观结构。在真空炉中，冷却速率通常由引入腔室中的气体（基本为N_2）的压力确定。施加了0至6巴的不同气压。根据气体压力，计算出的平均冷却速度在1180℃至400℃的范围内，并且在0.1至6℃/ s之间变化。考虑到冷却速率，增加氮气压力导致贝氏体/马氏体组织增加。微观结构的组成范围从在0 bar处理的系统中的97％珠光体+ 3％铁素体到在6 bar下应用N_2冷却的系统中的82％马氏体+ 18％贝氏体（含少量回火马氏体）。在所有加工条件下，均根据韧性，TRS和硬度评估了机械性能；对特性的分析允许绘制将不同特性关联为特征微结构的图。

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