Effect of Ca on Microstructure and Impact Toughness of 45 Steel
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摘要: 用端淬法研究了微量鈣對45鋼淬透性的影響,以及對正火態、調質態及淬火低溫回火態的顯微組織和室溫沖擊韌性的影響;用俄歇能譜(AES)分析了沿晶斷口表面鈣的含量.結果表明,微鈣鋼的淬透性稍低于無鈣鋼;微鈣鋼的奧氏體晶粒粗化、珠光體片層間距顯著增大,3種熱處理狀態下的室溫沖擊韌性均有所降低.這些現象與中碳合金鋼中所得結果有明顯不同.根據鈣在奧氏體晶界的偏聚現象及其與其他元素的偏聚互作用理論,對此進行了討論.Abstract: An effect of Ca on the hardenability,microstructures and impact toughness at room temperature of 45 steel has been investigated.The results show that a trace of Ca in 45 steel behaves towards microalloying.The longitudinal impact toughness at room temperature and hardenability are lowed by an addition of Ca.The austenite grains and interlamellar spacing of pearlite are coarsed,and some intergranular fractures have teen observed in 45Ca steel.AES analysis shows that Ca segregations markedly along austenite grain boundaries.The reasons to affect all of these phenomenons have been discussed by Casegregations on the austenite grain boundaries.
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