TG700A合金時效過程中的析出行為和力學性能

TG700A合金時效過程中的析出行為和力學性能Precipitation behavior and mechanical properties of TG700A alloy during aging

采用光學顯微鏡和掃描電子顯微鏡研究一種可用于先進超超臨界機組的新型鎳基合金TG700A在時效期間的析出行為，并討論時效對該合金硬度和沖擊性能的影響，同時，采用應力松弛方法對其高溫蠕變行為進行了研究。結果表明：M23C6碳化物在晶界上析出并迅速長大，充滿晶界后其長大速度逐漸放緩；主要強化相γ′在時效期間發生粗化，形態由球形逐漸向立方形轉變。時效后，該合金的沖擊韌性顯著下降；合金的硬度和蠕變激活能隨著時效時間的延長呈現出先增加后降低的趨勢，分析認為這與γ′粒子強化機制的轉變有關。

The precipitation behavior of a newly developed Ni-base superalloy TG700A was investigated by OM and SEM during aging at 770 ℃. And the effects of aging treatment on the room temperature hardness and impact toughness of TG700A were discussed, meanwhile, the stress relaxation test was used to analyze the creep behavior of this alloy. The results show that M23C6 carbides rapidly precipitate and grow at grain boundaries until they are covered the grain boundaries. Subsequently, the growth rate of M23C6 carbides slow gradually. As a primary strengthening phase, γ′ precipitates become coarse during aging. And the morphology of γ′ particles transforms from the approximately spherical to rounded cubic. The room temperature impact toughness decreases obviously after aging. Also, the hardness and creep activation energy of the alloy increase first, and then continuously decrease with the increase of aging time, as a result of the transition of γ′ precipitates strengthening mechanisms.

全文下載：https://pan.baidu.com/s/1UGH8h0iDLjv0oSWdKaxRJg?

作為值得信賴的合作伙伴和高品質金屬合金的半成品供應商，通項公司擁有完善的服務體系和專業的團隊。在同客戶交易的過程中，我們力求根據不同的應用需求將我們的產品做到精益求精。針對當前和未來的市場需求，通項公司致力于為客戶提供優質的金屬材料解決方案。

TXCO has been a reliable partner and supplier of sophisticated and high-quality semi-finished products maed of alloys. In dialogue with our customers, we optimise our products to meet the specific application requirements. TXCO develops the superior alloy material solutions for current and future challenges.

獲取更多我們供應的產品和服務信息，請致電086-021-3113 6111或發電子郵件service@sinoav.com聯系我們，您也可以通過微信，微博，領英，臉書，推特和谷歌+與我們互動。

For more information on the products and services that we supply, call us at 086-021-3113 6111 or email us at service@sinoav.com. You can also get in touch on social media, we are constantly active on Weixin, Weibo, LinkedIn, Facebook, Twitter and Google+.