马征,吕广焱,付莹,付连生,郭继宁,张鹏

• 1:渤海大学工学院
• 2:锦州博锐源创新科技有限公司

摘要(Abstract)：

利用热膨胀仪、高温共聚焦显微镜和扫描电镜等研究了淬火温度、保温时间和冷却速率等工艺参数对W2Mo9Cr4VCo8高速钢显微组织的影响,并对其硬度和冲击吸收能量进行测试。研究表明,当淬火温度为1100℃时,试验钢中的网状碳化物溶解不充分且分布不均匀;当淬火温度升至1180℃时,奥氏体组织会溶解更多的碳和合金元素,稳定性增强;进一步提高淬火温度至1200℃时,此时高温会引起大量的碳化物发生分解,同时溶入基体的合金元素数量增加,晶粒发生明显长大。当淬火温度在1100～1180℃时,W2Mo9Cr4VCo8高速钢的硬度和冲击韧性随淬火温度的升高而增大,但当淬火温度达到1200℃时,硬度值和冲击韧性减小。当淬火温度为1180℃,保温时间40 min时,钢的硬度达到最高(54.7 HRC),但当保温时间为60 min时,碳化物的平均尺寸增加、数量减少,硬度降低,而冲击韧性随着保温时间的增加而增加,当保温60 min时冲击吸收能量达到22.4 J。随着冷却速率的增加,马氏体转化开始温度(M_s)和结束温度(M_f)降低。因此,高冷却速率可以抑制马氏体转化并增加残留奥氏体含量。

关键词(KeyWords)： 高速钢;淬火温度;保温时间;冷却速率;硬度

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金青年基金(51704029)

作者(Author): 马征,吕广焱,付莹,付连生,郭继宁,张鹏

DOI: 10.13289/j.issn.1009-6264.2019-0561

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