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沉淀强化对耐磨板的影响及耐磨板的加热速率

所属分类:行业资讯 发布时间:2021-04-09 12:00:06 来源:http://www.lcnmb500.com 浏览量:

沉淀强化的耐磨板在力学性能方面的显著特点是屈服强度有大幅度提高。例如,经过沉淀强化处理的耐磨板的屈服强度达到480-8l0MPa,屈强比为0.55-0.56;采用钥、钒、铁复合合金化的耐磨板,弥散强化后的屈强比为0.60-0.65。

The remarkable feature of the mechanical properties of the precipitation strengthened wear-resistant plate is that the yield strength has been greatly improved. For example, the yield strength of the wear-resistant plate after precipitation strengthening treatment reaches 480-8l0mpa, and the yield strength ratio is 0.55-0.56; the yield strength ratio of the wear-resistant plate after dispersion strengthening is 0.60-0.65.

同时,沉淀强化耐磨板的硬度和冲击韧度也都有所提高。例如,耐磨板沉淀强化后的硬度为230-300 HBw,冲击韧度为140-180,更重要的是上述指标的提高并不带来塑性的显著下降。

At the same time, the hardness and impact toughness of the precipitation strengthened wear-resistant plate are also improved. For example, the hardness of wear-resistant plate after precipitation strengthening is 230-300 HBW, and the impact toughness is 140-180. More importantly, the increase of the above indexes does not lead to a significant decrease in plasticity.

沉淀强化对耐磨板的影响及耐磨板的加热速率(图1)

耐磨板在1100℃水淬后,先在中温区不同温度保温,后在970℃水淬后的性能。随着中温区保温温度的提高和保温时间的延长,钢中碳化物数量增加,沉淀强化效果增强,导致硬度有所提高。

After water quenching at 1100 ℃, the wear-resistant plate was first kept at different temperatures in the middle temperature region, and then quenched at 970 ℃. With the increase of holding temperature and holding time in medium temperature zone, the amount of carbides in the steel increases, the precipitation strengthening effect increases, and the hardness increases.

HARDOX450耐磨板的热导率只有碳钢的1/2,即使在900-1000℃高温阶段的热导率也低于碳钢在相同温度的热导率。因此,耐磨板的加热速率,特别是在低温阶段应低于碳钢,以避免铸件内部温度梯度过于陡峭而产生裂纹。

The thermal conductivity of hardox450 wear-resistant plate is only 1 / 2 of that of carbon steel, and even at 900-1000 ℃, the thermal conductivity of hardox450 wear-resistant plate is lower than that of carbon steel at the same temperature. Therefore, the heating rate of wear-resistant plate, especially in the low temperature stage, should be lower than that of carbon steel, so as to avoid cracks caused by too steep temperature gradient in the casting.

壁厚为40-80mm的铸件在700℃以下的加热速率不应超过100℃/h;壁厚为80-120mm的铸件不应超过75℃/h;壁厚超过120mm的铸件应小于50℃/h。在700℃以上,壁厚小于100mm的铸件可以随炉升温;而壁厚大于100mm的铸件,升温速率不超过100℃/h。

The heating rate of castings with wall thickness of 40-80mm below 700 ℃ shall not exceed 100 ℃ / h; castings with wall thickness of 80-120mm shall not exceed 75 ℃ / h; castings with wall thickness of more than 120mm shall be less than 50 ℃ / h. When the temperature is above 700 ℃, the temperature of castings with wall thickness less than 100 mm can be raised with the furnace, while the heating rate of castings with wall thickness more than 100 mm can not exceed 100 ℃ / h.