Die gestrichelte Linien in meinem diagramm soll bleiben aber nicht in die legende
\documentclass[
11pt, % Schriftgröße
paper=a4,
DIV=13, % Seitenlayout (Satzspiegel)
parskip=half, % Abstand zwischen Absätzen
%twoside, % Doppelseitig
%openright, % neues Kapitel rechts
% cleardoublepage,
bibtotoc, % Literaturverzeichis in Inhaltsverzeichnis
headsepline, % Kopfzeilentrennlinie
headings,
% draft, % Korrekturfassung
]{scrreprt} % scrartcl
% Eingabecodierung
\usepackage[utf8]{inputenc}
% Schriftcodierung
\usepackage[T1]{fontenc}
% Sprachraum
\usepackage[ngerman]{babel}
% Blindtext
\usepackage{blindtext}
% Schrifteinstellungen
\usepackage{lmodern} % Vektorschrift
\renewcommand{\familydefault}{\sfdefault} % Serifenlose Schrift
\usepackage{sansmath} % Mathe-Schrift ohne Serifen
\sansmath % aktiviert serifenlose Matheschrift
\usepackage{microtype} % harmonische Typenverteilung
%\usepackage{hyperref}
% Literatur einbinden
\usepackage{csquotes} % Steuerung der Anführungszeichen
\usepackage[
backend=biber, % Sortier-Compiler
style=numeric-comp, % Zitationsstil
block=ragged,
]{biblatex}
\addbibresource{ref/Bibliothek.bib}
\usepackage{booktabs}
% Mathemodus
\usepackage{amsmath,amssymb}
% Trennung
\hyphenation{Crash-zo-ne}
% Bilder einbinden
\usepackage{graphicx}
\graphicspath{{bilder/}}
\usepackage{svg}
\usepackage{pgfkeys}
\usepackage{tikz}
\usetikzlibrary{shapes.geometric, arrows}
\tikzstyle{startstop} = [rectangle, rounded corners,
minimum width=3cm,
minimum height=1cm,
text centered,
draw=black,
fill=red!30]
\tikzstyle{io} = [trapezium,
trapezium stretches=true, % A later addition
trapezium left angle=70,
trapezium right angle=110,
minimum width=3cm,
minimum height=1cm, text centered,
draw=black, fill=blue!30]
\tikzstyle{process} = [rectangle,
minimum width=3cm,
minimum height=1cm,
text centered,
text width=3cm,
draw=black,
fill=orange!30]
\tikzstyle{decision} = [diamond,
minimum width=3cm,
minimum height=1cm,
text centered,
draw=black,
fill=green!30]
\tikzstyle{arrow} = [thick,->,>=stealth]
\usepackage{pgfplots}\pgfplotsset{compat=newest}
\usetikzlibrary{arrows.meta,positioning,calc}
%für lange Tabelle
\usepackage{longtable}
\usepackage{algorithm}
\usepackage{algpseudocode}
\usepackage[export]{adjustbox}
% für tikz
\pgfplotsset{select coords between index/.style 2 args={
x filter/.code={
\ifnum\coordindex<#1\def\pgfmathresult{}\fi
\ifnum\coordindex>#2\def\pgfmathresult{}\fi
}
}}
\usepackage{subcaption}
\usepackage{pdfpages}
\usepackage{acronym}%abkürzung
\usetikzlibrary{arrows, decorations.markings}
\makeatletter
\tikzset{
nomorepostaction/.code=\makeatletter\let\tikz@postactions\pgfutil@empty,
my axis/.style={
postaction={
decoration={
markings,
mark=at position 1 with {
\arrow[ultra thick]{latex}
}
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decorate,
nomorepostaction
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thin,
-, % switch off other arrow tips
every path/.append style=my axis % this is necessary
%so it works both with "axis lines=left" and "axis lines=center"
}
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\renewcommand*\chapterheadendvskip{%
\vspace*{1\baselineskip plus -1\baselineskip minus .167\baselineskip}}
\begin{document}
\begin{figure}[htpb]
\begin{subfigure}{0.55\textwidth}
\begin{tikzpicture}
\begin{axis}[
%xtick=\empty,
xlabel={$x$},
ylabel={$y$},
ymax=1.1,
%title={Plot der Funktion $y = x^2$},
grid=major,
domain=0:5,
axis line style={my axis},
samples=100,
axis lines=left,
xticklabel={\ifdim\tick pt=0pt \else\pgfmathprintnumber{\tick}\fi},
legend pos=south east,
]
\addplot[red,line width=1.5pt] {1-e^-x};
\addlegendentry{$x$};
% \addplot[blue, dashed]{1};
\addplot[blue,domain=0:1.25,line width=1.5pt]{0.8*x};
\addlegendentry{$y$};
\addplot[gray, dashed,line width=1.5pt]{1};
\end{axis}
\end{tikzpicture}
\caption{bild a}
\label{a}
\end{subfigure}%
\begin{subfigure}{0.5\textwidth}
\begin{tikzpicture}
\begin{axis}[
xlabel={$t$},
%ylabel={$xy$},
ymax=1.1,
grid=major,
domain=0:5,
samples=100,
axis lines=left,
axis line style={my axis},
xticklabel={\ifdim\tick pt=0pt \else\pgfmathprintnumber{\tick}\fi},
legend pos=south east,
]
\addplot[red,domain=0:1,line width=1.5pt] {x^2};
\addlegendentry{$x$}
\addplot[dashed,domain=0:1,line width=1.5pt] {x};
\draw[green] (0.2,0.2) -- (0.2,0.4) -- (0.4,0.4);
\node at (0.2,0.5) [green] {steig};
% Unsichtbarer grüner Plot für die Legende
\addlegendimage{green, line width=1.5pt};
\addlegendentry{steig};
\end{axis}
\end{tikzpicture}
\caption{bild b}
\label{b}
\end{subfigure}
\caption{Veranschaulichung}
\end{figure}
\end{document}
