工程机械用Q1100钢的热处理工艺

来源 :金属热处理 | 被引量 : 0次 | 上传用户:yj8888888
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以一种屈服强度为1100 MPa的高强度工程机械用钢为对象,研究了再加热淬火温度(880~980℃)和回火温度(200~650℃)对Q1100钢显微组织和力学性能的影响.结果表明,淬火温度从880℃升高至980℃,试验钢的平均奥氏体晶粒尺寸从8μm增加到24μm,试验钢的屈服强度和抗拉强度都呈先升高后降低的趋势,并在920℃时达到最大,而-40℃冲击性能则随之持续降低.试验钢经920℃淬火+200~650℃回火后,随着回火温度的提高,试验钢的马氏体板条合并,板条形貌逐渐模糊,碳化物数量和形貌也随之发生改变,强度大幅下降,塑性和韧性则先降低后升高.试验钢最佳的热处理工艺为920℃淬火+200~250℃回火.
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