深冷處理后SKD11機理研究鋼組織與沖擊磨料磨損
陳婷，劉長華，孫國棟，韓洺波，高朋（九江學院材料科學與工程學院，江西九江332005）
摘要：利用金相顯微鏡、掃描電子顯微鏡、硬度計和沖擊試驗機觀察并測試了淬火+深冷處理+回火處理（簡稱“深冷處理”）后SKD11鋼的顯微組織、硬度和沖擊性能，利用MLD-10型動載荷磨損試驗機測試了該工藝下SKD11鋼的沖擊磨料磨損性能，并對沖擊磨料磨損的機理進行了分析。研究結果表明：深冷處理后SKD11鋼的組織由隱晶馬氏體、殘余奧氏體和不同種類的碳化物組成，碳化物包括共晶碳化物、未熔碳化物和點狀碳化物。深冷處理SKD11鋼的硬度為59.2HRC，無缺口試樣的沖擊功約為16J。在沖擊磨料磨損試驗中，深冷處理的SKD11鋼磨損量隨磨損時間近似呈線性增加，在所研究的磨損時間內，深冷處理后SKD11鋼前期的磨損機理主要為微觀切削磨損和多次塑性變形磨損，后期的磨損機理主要為應變疲勞磨損。
關鍵詞：SKD11鋼；深冷處理；顯微組織；沖擊韌性；沖擊磨料磨損
中圖分類號：TG141.2 文獻標識碼：A
文章編號：1001-2168（2021）06-0063-05 DOI：10.16787/j.cnki.1001-2168.dmi.2021.06.013
Study on microstructure and impact and abrasion mecha? nism of SKD11 steel after cryogenic treatment
CHEN Ting, LIU Chang-hua, SUN Guo-dong, HAN Ming-bo, GAO Peng (School of Materials Science and Engineering, Jiujiang University, Jiujiang, Jiangxi 332005, China)
Abstract: The microstructure and mechanical properties of SKD11 steel after quenching, cryogenic treatment and tempering (abbreviated to cryogenic treatment) were observed and tested by metallographic microscope, scanning electron microscope, hardness tester and impact tester. The MLD- 10 dynamic load wear tester was used to test the impact and abrasive property of SKD11 steel under the cryogenic treatment process, and the wear mechanism was analyzed. The results showed that the structure of SKD11 steel was composed of tempered martensite, retained austenite and different carbides in the cryogenic treatment process. The carbides were mainly eutectic carbides and unmelted carbides. Under the cryogenic treatment, the hardness of the SKD11 steel was 59.2 HRC, and the impact energy of the unnotched sample under normal temperature was about 16 J. In the impact and abrasive wear test, the amount of wear of the cryogenic SKD11 steel increased al? most linearly with the wear time. During the wear time studied, the wear mechanism of SKD11 steel after cryogenic treatment was mainly micro-cutting wear and plastic deformation wear in the early stage and strain fatigue wear in the later stage.
Key words: SKD11 steel; cryogenic treatment; microstructure; impact toughness; impact and abrasion wear