霍喜伟,宋玉卿,柴湘雨,李承,蓝慧芳,杜林秀

• 1:山东钢铁股份有限公司
• 2:东北大学轧制技术及连轧自动化国家重点试验室

摘要(Abstract)：

首先对27CrMnB履带钢分别进行一次淬火+回火与二次淬火+回火热处理,随后采用扫描电镜、透射电镜和万能拉伸试验机等分析了试验钢在不同热处理工艺下的组织与性能演变规律。结果表明:在850～900℃一次淬火+200℃回火条件下,试验钢的强度和硬度随淬火温度升高呈上升趋势;当一次淬火温度超过900℃时,奥氏体晶粒开始长大,从而造成强度和韧性均随着淬火温度的升高而下降;随着回火温度由200℃升高至400℃,碳化物逐渐析出,强度和硬度降低,冲击韧性和断后伸长率先降低后升高,在250～300℃出现第一类回火脆性;在800～860℃二次淬火+200℃回火条件下,随二次淬火温度升高,试验钢的抗拉强度逐渐增加,冲击韧性呈先升高后降低的趋势;一次淬火和二次淬火工艺比较结果表明,二次淬火工艺可以显著细化原奥氏体晶粒尺寸,在基本不降低强度的前提下提高韧性,820～860℃二次淬火条件下冲击韧性提升幅度为9%～19%,其中,820℃二次淬火时强韧性匹配最好,抗拉强度为1685 MPa,冲击吸收能量为56 J。

关键词(KeyWords)： 27CrMnB履带钢;淬火-回火热处理;二次淬火;强韧性

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 霍喜伟,宋玉卿,柴湘雨,李承,蓝慧芳,杜林秀

DOI: 10.13289/j.issn.1009-6264.2024-0473

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