外文翻譯--tp347h奧氏體不銹鋼在550℃低循環(huán)疲勞下的動態(tài)應變時效對應變幅度的影響譯文-其他專業(yè)-資料下載頁
2025-01-19 09:50本頁面
【導讀】摘要：TP347H（奧氏體）不銹鋼在550℃下,應變速率為1-3-s108?研究結(jié)果表明，該鋼在550℃下的循環(huán)載荷。的應激反應和位錯結(jié)構(gòu)強烈依賴于應變幅度的值。與那些相同的應變幅度在室溫相比，該。時達到穩(wěn)定狀態(tài)，但在達到。第一次循環(huán)中因位錯交叉滑移和平面結(jié)構(gòu)造成更多的晶粒發(fā)生動態(tài)應變時效。，在±％的低應變幅度下限制進一步交叉滑移。和微觀結(jié)構(gòu)演變可能是在550℃出現(xiàn)DSA的影響。由于溫度梯度必然存在，高溫系統(tǒng)的組成部分通常要受交變的熱應力作用，尤其是在開始或結(jié)束的時刻，或者在溫度瞬變時刻。研究表明，在250℃到650℃的高溫下，在交變。LCF期間，在平面滑移帶之間緩慢移動的位錯提高變形的不均勻程度。面在主要應激反應階段和二次循環(huán)硬化的最后階段造成循環(huán)硬化。據(jù)報道，DSA降低LCF. 為了達到比較的目的，在室溫下無DSA機制時也要進行LCF測試。測量的狗骨標本加工成28毫米標距長度和7毫米軸距直徑。為了消除表面缺陷，如機。JSM-6360LV掃描電子顯微鏡適用于檢查試樣的斷裂面。
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