貝氏體白口耐磨鑄鐵磨球的研究

化工論文編號(hào):HG015  附任務(wù)書,開題報(bào)告,外文翻譯,論文正文字?jǐn)?shù):16247,頁數(shù):39
目   錄

1  引言…………………………………………………………………………………………… 1
1.1  研究貝氏體耐磨材料的背景及重要意義……………………………………………… 1
1.2  貝氏體組織與性能…………………………………………………………………2
1.3  鉻系抗磨白口鑄鐵………………………………………………………………………… 5
1.4  鉻系抗磨白口鑄鐵的熱處理工藝……………………………………………………… 7
2  試驗(yàn)設(shè)備與方案…………………………………………………………………… 13
2.1  實(shí)驗(yàn)所用設(shè)備……………………………………………………………………… 13
2.2  實(shí)驗(yàn)材料…………………………………………………………………………… 13
2.3  實(shí)驗(yàn)方案…………………………………………………………………………… 13
3  試驗(yàn)步驟…………………………………………………………………………… 15
3.1  試樣的制備………………………………………………………………………… 15
3.2  試樣的淬火………………………………………………………………………… 16
4 實(shí)驗(yàn)結(jié)果…………………………………………………………………………… 18
4.1  試樣淬火后的硬度值……………………………………………………………… 18
4.2  顯微硬度…………………………………………………………………………… 21
4.3  試樣經(jīng)熱處理后的顯微組織……………………………………………………… 22
5  結(jié)果分析…………………………………………………………………………… 31
5.1  試樣經(jīng)水玻璃淬火后的測(cè)量結(jié)果的分析………………………………………… 31
5.2  試樣經(jīng)等溫淬火后的測(cè)量結(jié)果分析……………………………………………… 33
5.3  試驗(yàn)總結(jié)和改進(jìn)………………………………………………………………… 34
結(jié)論 ………………………………………………………………………………… 36
致謝 ………………………………………………………………………………… 37
參考文獻(xiàn)………………………………………………………………………………38

摘 要

下貝氏體組織被認(rèn)為是一種綜合力學(xué)性能比較理想的組織，而且鉻系白口鑄鐵是一種優(yōu)良的抗磨材料，因此本課題把貝氏體白口耐磨鑄鐵作為研究對(duì)象。擬采用三種成分的白口鑄鐵試樣，采用三種淬火工藝獲得下貝氏體組織。將試樣加熱至900℃保溫1小時(shí)全部奧氏體化，在水玻璃中淬火不同時(shí)間后在漂珠中保溫1.5小時(shí)或者在等溫硝鹽或是等溫油中不同溫度等溫1小時(shí)。實(shí)驗(yàn)結(jié)果表明：試樣I (12%-16%Cr、2.8%-3.0%C、0.8%-1.2%Si、0.6%-0.8%Mn )；試樣II (4%-6%Cr、2.8%-3.0%C、0.8%-1.2%Si、0.6%-0.8%Mn)和試樣Ⅲ(2%-3%Cr、2.9%-3.1%C、0.8%-1.2%Si、0.6%-0.8%Mn)在三種工藝下均未得到下貝氏體組織。認(rèn)定為材料中缺少下貝氏體形成的關(guān)鍵的Ni、 Mo、Cu等合金元素以及形成條件不夠，因此生成下貝氏體組織困難。

關(guān)鍵詞  貝氏體  白口鑄鐵  等溫淬火  水玻璃

Abstract
Lower Bainite organizations is considered to be a more desirable mechanical properties of the integrated organization，and white cast iron is an excellent anti-wear materials，therefore the subject is a study of bainitic wear-resistant white cast iron .Three components of white cast iron samples to be used in three types of quenching process to get the Lower Bainite.Heating the samples to 900 ° C for 1 hour to form complete austenite, quenching in sodium silicate for different times and then insulating them for 1.5 hours in cenosphere、isothermal oil or isothermal molten salt at different isothermal temperature for 1 hour. Experimental results show:Lower Bainite can not be obtained in sample I (12%-16%Cr、2.8%-3.0%C、0.8%-1.2%Si、0.6%-0.8%Mn )；sample Ⅱ(4%-6%Cr、2.8%-3.0%C、0.8%-1.2%Si、0.6%-0.8%Mn)；and sample Ⅲ(2%-3%Cr、2.9%-3.1%C、0.8%-1.2%Si、0.6%-0.8%Mn).It's considered to be  Lacking of  Ni, Mo, Cu and other alloying elements,which is very key to Lower Bainite to be obtained，as well as the formation of inadequate conditions, so Lower Bainite is diffcult to be obtained.

Key Words  Bainite   White cast iron   Sodium silicate quenching  Isothermal quenching