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Not only smart in construction, but also clever in your wallet. Follow these links to investments that I use to build up your account balance. Bondora (P2P investment): https://bondora.com/ref/BO4436714 DeGiro Broker (ETFs and other investments): If you register using this link, you will receive a transaction voucher of up to 100€. https://www.degiro.de/kunden-werben-k... If you register using this link, you will receive a transaction voucher of up to 100€. Zinspilot Find the best interest rates across Europe and receive the win-win bonus: https://www.zinspilot.de/werbepraemie... OSKAR (Roboadvisor) 10 euros free. I already invest with OSKAR. All you have to do is open an OSKAR account and make your first deposit. Use this link to open an account: https://www.oskar.de/gutscheincode/ph... The Practory, the online community for the construction industry Free registration link: https://thepractory.com/bauingenieurw... Link for students (the content is free if you upload your certificate of enrollment): https://community.thepractory.com/abo... ▬▬▬ DISCLAIMER ▬▬▬▬▬▬▬▬▬▬▬ The links shown above are affiliate links. If you use them to register with the respective provider, I will receive a referral bonus. There are no additional costs for you. On the contrary, you usually even get a bonus yourself. At the same time, you are supporting my channel (win-win!) and I thank you for that. This text does not constitute investment advice. I act purely as a private individual. I accept no liability for the viewer's investment decisions. Investing in any asset or money can be risky and can result in a complete loss of capital. 00:00 Intro 00:42 The iron-carbon diagram explained 01:40 Different phases 03:57 Influence of cooling rate