【摘要】：利用X射線衍射(XRD)、熱膨脹儀、電子背散射衍射(EBSD)研究了兩相區(qū)回火溫度對(duì)一種Mn-Mo系微合金鋼亞穩(wěn)奧氏體形成及力學(xué)性能的影響。結(jié)果表明:當(dāng)兩相區(qū)回火溫度低于650℃時(shí),實(shí)驗(yàn)鋼的亞穩(wěn)奧氏體具有較好的穩(wěn)定性,其室溫下的體積分?jǐn)?shù)隨著兩相區(qū)回火溫度的升高逐漸增大;當(dāng)兩相區(qū)回火溫度高于650℃時(shí),亞穩(wěn)奧氏體的穩(wěn)定性顯著降低,在回火冷卻過(guò)程中,部分奧氏體轉(zhuǎn)變?yōu)?新鮮"馬氏體,室溫亞穩(wěn)奧氏體體積分?jǐn)?shù)隨兩相區(qū)回火溫度升高而逐漸降低。當(dāng)兩相區(qū)回火溫度為650℃時(shí),鋼中亞穩(wěn)奧氏體具有最佳的體積分?jǐn)?shù)和穩(wěn)定性配合。力學(xué)測(cè)試結(jié)果表明:當(dāng)兩相區(qū)回火溫度為650℃時(shí),實(shí)驗(yàn)鋼的力學(xué)性能最佳,其屈服強(qiáng)度為748MPa,抗拉強(qiáng)度為813MPa,伸長(zhǎng)率為27.5%,-20℃和-100℃的沖擊功分別為217J和117J。
[Abstract]:The effect of tempering temperature in two-phase region on the formation of metastable austenite and mechanical properties of a Mn-Mo system microalloyed steel was studied by means of X-ray diffraction (XRD), thermal expansion instrument and electron backscatter diffraction (EBSD). The results show that the metastable austenite of the experimental steel has good stability when the tempering temperature of the two-phase zone is lower than 650 鈩，

本文編號(hào)：2293192