The results show that quenched steel treated at 1000~1040℃ is more reasonable, quenched at 1030℃, tempered at 300~350℃, the microstructures are small uniform martensite, which has high strength and certain toughness; quenched at 1030℃, tempered at 600~650℃, The microstructure of the steel is tempered sorbite which has good mechanical properties.

結(jié)果表明：1Cr16Ni4Nb鋼在1000~1040℃淬火較合理，在1030℃淬火99reshipin、300~350℃回火時玖色网站，組織為均勻細小的回火馬氏體，其具有較高的強度和一定的韌性欧美激情偷乱人伦小说；在1030℃淬火5555www、600~650℃回火時，1Cr16Ni4Nb鋼的組織為回火索氏體午夜福利照片，其具有較高的綜合力學性能天天日夜夜操野外群奸的黄色片。

This paper, basing on the software system, analyzes the quenching process at point of diathermanous subject view; introduces the instrument of measurement and the experiment principle; concretely analyses the mathematic models and processing method of the data-processing system, which is the theoretic groundwork for programming; describes the makeup of the software and how to design and actualize it.

論文部分基于作者所開發(fā)的淬火介質(zhì)冷卻性能測試軟件系統(tǒng)，從傳熱學的角度分析了淬火冷卻過程欧美性交ααα,AAA；介紹了淬火冷卻性能測試設(shè)備及原理人人爽人人看；重點分析了數(shù)據(jù)處理系統(tǒng)部分數(shù)學模型的建立及相應的數(shù)學處理方法，這部分是系統(tǒng)編程的理論基礎(chǔ)欧美淫荡性交免费；并概述了系統(tǒng)的構(gòu)成中国熟妇色XXXXX不卡，軟件的設(shè)計及實現(xiàn)。

A steel plate having a tensile strength of at least about 930 MPa (135Ksi), a toughness as measured by Charpy V-notch impact test at least about 120 joules (88 ft-lb), and a microstructure comprising at least about 90 volume percent of a mixture of fine-grained lower bainite and fine-grained lath martensite, wherein at least about 2/3 of said mixture consists of fine-grained lower bainite transformed from unrecrystallized austenite having an average grain size of less than about 10 microns and comprising iron and specified weight percentages of the additives: carbon, silicon, manganese, copper, nickel, niobium, titanium, aluminum, calcium,rare earth metals, and magnesium, is prepared by heating a steel slab to a suitable temperature; reducing the slab to form plate in one or more hot rolling passes (10) in a first temperature range in which austenite recrystallizes; further reducing said plate in one or more hot rolling passes (10) in a second temperature range in which austenite does not recrystallize, quenching (12) said plate to a suitable quench stop temperature (16); and stopping said quenching and allowing said plate to air cool (18) to ambient temperature.

一種鋼板久久精品国产国产精福利，其抗拉強度至少約930MPa135ksi）2级a片网站免费看，在－40℃（－40°F）下，采用夏氏V型缺口沖擊試驗測定的韌性至少約120焦耳（88英尺－磅）日韩性色自拍视频在线观看免费播放，并且其顯微組織包含至少約90％體積的細晶粒的下貝氏體和細晶粒的板條馬氏體的混合物国产精品极品资源福利，其中該混合物的至少約2／3由從平均粒徑小于約10微米的未再結(jié)晶奧氏體轉(zhuǎn)變而來的細晶粒的下貝氏體組成，而且爱看AV在线官网，其中所述的鋼板包含鐵和特定重量百分比的添加元素：碳殴美一级高清视频在线、硅、錳、銅200毛片、鎳国产女人久久二级的毛片、鈮、鈦色色色色鬼、鋁综合区图片区视频区亚小说区、鈣、稀土金屬和鎂午夜免费A片，所述鋼的制備過程為：將一鋼板坯加熱至一個適當?shù)臏囟妊侵夼访阑粕夥芽矗辉趭W氏體可發(fā)生再結(jié)晶的第一個溫度范圍內(nèi)，采用一個或多個熱軋道次（10）中国熟妇性视频一区，將所述板坯軋制成板材日日爱自拍com；在奧氏體不發(fā)生再結(jié)晶的第二個溫度范圍，采用一個或多個熱軋道次（10）進一步軋制所述板材www.色色色色色色色色色；將所述板材淬火處理（12）至一個適當?shù)?strong>淬火終止溫度（16）www日免费看；停止所述淬火處理并將所述板材空冷（18）至室溫。

Through a series of quenching, tempering, tensile testing, low-temperature impact test and metallographic analysis, we ultimately came to the following conclusions:(1) low-carbon alloyed steel 20CrMn2NiMoV quenching at 870℃ and tempering at 200℃, whose structure contains tempered dislocation lath martensite and few small bainite under mixed, has the best obdurability;(2) Carbon Steel 45CrMn2NiMoV quenching at 850℃ and tempering at 620℃, whose structure is sorbitic, has a performance less than that of low-carbon Alloyed steel, but it can also meet the basic design requirements.(3) Mn can substitute for the role of Ni within limited extent.

通過一系列淬火AV影院网站、回火18岁以内禁看黄色视频、拉伸試驗、低溫沖擊試驗以及金相分析日韩不卡视频毛片，最終得出以下主要結(jié)論：（1）低碳合金鋼20CrMn2NiMoV經(jīng)870℃淬火+200℃回火免费看毛片视频在线播放，得到回火位錯型板條馬氏體+少量細小下貝氏體的混合組織，具有最佳的強韌性配合欧美熟妇白嫩大屁黑人啪啪；（2）中碳合金鋼45CrMn2NiMoV經(jīng)850℃淬火+620℃回火日韩三级欧美一区中文，得到回火索氏體組織，綜合性能雖然不及低碳合金鋼毛片加双，但也能基本滿足設(shè)計要求情侣一级网址看毛片；（3）Mn在一定程度上能夠替代Ni的作用，適量的Mn和Ni相互配合可以得到最佳的低溫韌性国产一级毛片无码视频，因此&以Mn代Ni&是低溫鋼材料研究開發(fā)中一條可行的適合我國資源狀況的合金化思路国产拍在线。

An ultra-high strength, weldable, low alloy steel with excellent cryogenic temperature toughness in the base plate and in the heat affected zone when welded, having a tensile strength greater than 830 MPa (120 ksi) and a micro-laminate microstructure comprising austenite film layers and fine-grained martensite/lower bainite laths, is prepared by heating a steel slab comprising iron and specified weight percentages of some or all of the additives carbon, manganese, nickel, nitrogen, copper, chromium, molybdenum, silicon, niobium, vanadium, titanium, aluminum, and boron; reducing the slab to form plate in one or more passes in a temperature range in which austenite recrystallizes; finish rolling the plate in one or more passes in a temperature range below the austenite recrystallization temperature and above the Ar3 transformation temperature; quenching the finish rolled plate to a suitable Quench Stop Temperature; stopping the quenching; and either, for a period of time, holding the plate substantially isothermally at the QST or slow-cooling the plate before air cooling, or simply air cooling the plate to ambient temperature.

在基體板以及焊接時的熱影響區(qū)處的低溫韌性優(yōu)異的超高強度、可焊接欧美A级喷水视频免费看、低合金鋼具有高于830MPa（120ksi）的抗拉強度国产精品第二页，并且具有包含奧氏體薄膜層和細晶粒的馬氏體／下貝氏體板條的顯微層狀組織，所述鋼的制備過程為：加熱含有鐵以及特定重量百分比的添加元素的鋼坯欧美日韩黄大片一区，所述添加元素為碳华人黄视频网站，錳，鎳看A片免费的网址，氮国产熟女AV免费观看尤物，銅在线。中文字幕，鉻，鉬免费欧美在线，硅，鈮黄色一级无码AV，釩黄页网站视频在线看，鈦，鋁一级欧美黄片在线播放，以及硼中的一些或全部aa精品视频在线观看；在奧氏體可發(fā)生再結(jié)晶的溫度范圍內(nèi)，采用一個或多個道次先锋影音无码资源，將所述鋼坯軋制成板材欧美A片久久；在低于奧氏體再結(jié)晶溫度但高于Ar 3 轉(zhuǎn)變點的溫度下，采用一個或多個道次對所述板材進行終軋欧美日韩在线A片一区二区；將所述終軋板材淬火至一適當淬火終止溫度最近免费中文,最近免费中文字幕大全；停止所述淬火；或者在空冷前在QST點基本等溫保持所述板材一段時間欧美精品欧美极品欧美视频，或者對所述板材進行緩慢冷卻免费1级毛片高1级毛片视频了，或者只是簡單地將所述板材空冷至室溫。

Compared with conventional quenched and tempered process, Direct quenching eliminated off-line reheating and quenching, reduced processing costs and shortened process, in addition, DQ process increase hardenability ,weldability, and mechanical balance by reducing alloy elements.

本文以工業(yè)生產(chǎn)的轉(zhuǎn)爐連鑄22SiMn2TiB鋼為研究對象熟妇激情内激情内射图片，以實驗室熱軋實驗為主要研究手段美女野外后λ式动态图片搜索，對直接淬火工藝在不同軋制條件下對鋼板微觀組織與力學性能的影響進行了研究，同時與再加熱淬火工藝進行了比較欧美巨大XXXX做受高清，探討了此類鋼在低溫回火下提高強韌性的可能性和直接淬火工藝的機理夜夜爽88888妓女性视频。

The distortion of bearing ring during and after quenching in continuous conveyer belt type furnace is analyzed.

對軸承熱處理常用輸送帶式淬火爐淬火過程中及淬火后軸承零件的畸變進行了分析，討論了影響軸承套圈畸變的因素及機理国产微拍精品一区91，提出了減小畸變的具體措施国产在线xx。

The microstructure of hardened layer and formation mechanism were investigated.The microstructure of hardened layer consist of the completely hardened region and the transition region.The completely hardening region is composed of fine acicular martensites,residual austenites and a few dot-like carbonides.From surface to bottom in the hardened layer,the microstructure varies from fine to coar...

結(jié)果表明：采用適當?shù)哪ハ鲄?shù)可滿足該鋼所要求的淬火溫度，進而獲得適宜的淬硬層顯微硬度和強化層深度又黄又粗又长一区二区视频；磨削淬火層由完全硬化區(qū)和過渡區(qū)組成欧美一二区夜夜嗨影音先锋；完全硬化區(qū)主要由細小針狀馬氏體組成，從表面到里層久久久这里精品国产，組織形貌呈現(xiàn)&細→粗→細&的變化規(guī)律91无码视频在线专区，其形成機理是熱-力耦合作用影響磨削淬火過程中的奧氏體晶粒大小及其位錯密度，并將直接影響轉(zhuǎn)變后的馬氏體組織形貌美女爽到高潮朝喷的视频4399。

The study and comprehensive analysis of static high-pressure quenching experiments and laboratory dynamic high-pressure experiments on chondrites,as well as the study of shock-induced phase transition of minerals in the Suizhou meteorite revealed that the P-T conditions for phase transition of minerals during natural impact events,such as collision of cosmic bodies or impact of meteorites on the Earth′s surface,are not consistent with those obtained by shock experiments on chondrites or rocks in laboratory,...

通過對球粒隕石的靜態(tài)高壓淬火實驗和人工動態(tài)高壓實驗的研究和綜合分析91最新黄色视频网址资源，以及對在太空中經(jīng)受過撞擊的隨州隕石中礦物發(fā)生高壓相變的研究，查明了自然界的沖擊事件黄色网站在线免费。观看，如星體的相互碰撞和隕石對地球表面的撞擊中黄色视频免费入口处在线观看，礦物發(fā)生相變的P-T條件與人工沖擊波實驗的結(jié)果并不一致涩涩网站视频，而與靜態(tài)高壓淬火實驗的結(jié)果相似，即前者類似靜態(tài)高壓淬火實驗亚洲最大黄色一及片，保壓時間較長操逼视频网站网站视频网站，能產(chǎn)生高壓礦物，后者保壓時間極短国产福利不卡，無高壓礦物形成人人人人人人人人人人艹。

Crack reasons for this are: the heating temperature is too high as a result of quenching or cooling in a hurry, the quality of thermal stress and metal volume changes in the organization of the anti-stress than the breaking strength of steel; the work of the original surface defects (such as surface micro-cracks or scratches) or the internal defect of steel (such as slag, serious non-metallic inclusions, white point, the residual cavity, etc.) formed in the quenching stress concentration; serious Decarburization and carbide surface segregation; parts after quenching Back lack of timely or tempering fire; processes in front of the stress caused by excessive cold red, forging folding, turning deep marks, sharp edges and corners, such as the oil groove.

造成這種裂紋的原因有：由于淬火加熱溫度過高或冷卻太急，熱應力和金屬質(zhì)量體積變化時的組織應力大于鋼材的抗斷裂強度射视频色草；工作表面的原有缺陷或是鋼材內(nèi)部缺陷（如夾渣国产大全色婷婷五月月天、嚴重的非金屬夾雜物、白點欧美成了人片A片免费、縮孔殘余等）在淬火時形成應力集中女人腿张开让男人桶爽动态图片；嚴重的表面脫碳和碳化物偏析；零件淬火后回火不足或未及時回火国产黄色视频污免费；前面工序造成的冷沖應力過大免费网站a、鍛造折疊、深的車削刀痕激情的小说视频、油溝尖銳棱角等日韩欧亚自拍视频在线播放免费观看。